Update security policy

chore: combine the if statements into one (#5785 )
fix: inRange test (#5821 )
2026-01-29 14:37:49 +00:00 · 2024-10-06 13:19:41 -04:00 · 2024-07-10 15:56:03 -05:00 · 2024-04-15 22:55:09 -04:00 · 2024-01-11 09:07:57 -08:00 · 2023-09-27 10:00:44 -07:00
846 changed files with 38400 additions and 146481 deletions
--- a/.commitlintrc.js
+++ b/.commitlintrc.js
@@ -0,0 +1,29 @@
+'use strict';
+
+module.exports = {
+  extends: [
+    '@commitlint/config-conventional', // scoped packages are not prefixed
+  ],
+  rules: {
+    'type-enum': [
+      2,
+      'always',
+      [
+        'build',
+        'chore',
+        'ci',
+        'docs',
+        'feat',
+        'fix',
+        'perf',
+        'proposal',
+        'refactor',
+        'release',
+        'revert',
+        'style',
+        'test',
+        'wip',
+      ],
+    ],
+  },
+};
--- a/.eslintignore
+++ b/.eslintignore
@@ -0,0 +1,5 @@
+coverage/
+coverage-merged/
+dist/
+node_modules/
+types/
--- a/.eslintrc
+++ b/.eslintrc
@@ -0,0 +1,99 @@
+{
+  "extends": ["airbnb-base", "prettier"],
+  "root": true,
+  "env": {
+    "amd": true,
+    "browser": true,
+    "es6": true,
+    "jest": true,
+    "node": true
+  },
+  "globals": {
+    "BigInt": "readonly",
+    "BigInt64Array": "readonly",
+    "BigUint64Array": "readonly",
+    "globalThis": "readonly"
+  },
+  "parserOptions": {
+    "ecmaVersion": 2020,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "prettier"
+  ],
+  "rules": {
+    "prettier/prettier": "error",
+    // Overridden
+    "camelcase": ["error", { "properties": "never", "allow": [ "W[0-9]+_"] }],
+    "import/extensions": "off",
+    "no-eval": "off",
+    "no-self-compare": "off",
+    "one-var": ["error", "never"],
+    // @TODO: Fix the following rules progressively.
+    "arrow-body-style": "warn",
+    "prefer-arrow-callback": "warn",
+    "prefer-object-spread": "off",
+    "max-classes-per-file": "off",
+    "dot-notation": "off",
+    "object-shorthand": "off",
+    "no-param-reassign": "off",
+    "no-cond-assign": "off",
+    "prefer-destructuring": "off",
+    "func-names": "off",
+    "no-nested-ternary": "off",
+    "no-plusplus": "off",
+    "strict": "off",
+    "no-restricted-syntax": "off",
+    "import/no-mutable-exports": "off",
+    "guard-for-in": "off",
+    "import/prefer-default-export": "off",
+    "prefer-rest-params": "off",
+    "prefer-spread": "off",
+    "no-lonely-if": "off",
+    "no-prototype-builtins": "off",
+    "no-continue": "off",
+    "no-shadow": "off",
+    // Rules up for discussion.
+    "no-multi-assign": "off",
+    "new-cap": "off"
+  },
+  "overrides": [
+    {
+      "files": ["**/*.ts"],
+      "parserOptions": {
+         "project": "./tsconfig.json"
+      },
+      "extends": [
+        "airbnb-typescript/base",
+        "prettier"
+      ],
+      "plugins": ["@typescript-eslint"],
+      "rules": {
+        "@typescript-eslint/no-unused-vars": [
+          "warn",
+          {
+            "vars": "all",
+            "args": "after-used",
+            "ignoreRestSiblings": true,
+            "argsIgnorePattern": "^_" // For tsc compatibility.
+          }
+        ],
+        "comma-dangle": "off",
+        "implicit-arrow-linebreak": "off", // Conflicts with prettier.
+        "import/extensions": "off",
+        "import/prefer-default-export": "off",
+        "operator-linebreak": "off",
+        "object-curly-newline": "off",
+        "prefer-rest-params": "off", // We need to use params.
+        "prettier/prettier": "error",
+        "@typescript-eslint/no-shadow": "warn",
+        "@typescript-eslint/no-use-before-define": ["warn", { "functions": false }],
+        "import/no-cycle": "warn",
+        "no-bitwise": "off",
+        "no-unsafe-finally": "warn",
+        "no-param-reassign": "off",
+        "no-shadow": "warn"
+      }
+    }
+  ]
+}
--- a/.gitattributes
+++ b/.gitattributes
@@ -1 +1,2 @@
 * text=auto
+*.lockb binary diff=lockb
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -1,7 +1,13 @@
+# :construction: Notice :construction:
+
+Pardon the mess. The `master` branch is in flux while we work on Lodash v5. This
+means things like npm scripts, which we encourage using for contributions, may
+not be working. Thank you for your patience.
+
 # Contributing to Lodash

 Contributions are always welcome. Before contributing please read the
-[code of conduct](https://js.foundation/community/code-of-conduct) &
+[code of conduct](https://code-of-conduct.openjsf.org) &
 [search the issue tracker](https://github.com/lodash/lodash/issues); your issue
 may have already been discussed or fixed in `master`. To contribute,
 [fork](https://help.github.com/articles/fork-a-repo/) Lodash, commit your changes,
@@ -19,21 +25,19 @@ Before submitting a request, please search for similar ones in the

 ## Pull Requests

-For additions or bug fixes you should only need to modify `lodash.js`. Include
-updated unit tests in the `test` directory as part of your pull request. Don’t
-worry about regenerating the `dist/` or `doc/` files.
+For additions or bug fixes, please modify the relevant files. Include
+updated unit tests in the `test` directory as part of your pull request.
+Unit test files should be named `[filename].test.js`.

 Before running the unit tests you’ll need to install, `npm i`,
 [development dependencies](https://docs.npmjs.com/files/package.json#devdependencies).
-Run unit tests from the command-line via `npm test`, or open `test/index.html` &
-`test/fp.html` in a web browser. The [Backbone](http://backbonejs.org/) &
-[Underscore](http://underscorejs.org/) test suites are included as well.
+Run unit tests from the command-line via `npm test`.

 ## Contributor License Agreement

-Lodash is a member of the [Open JS Foundation](https://openjsf.org/).
-As such, we request that all contributors sign our
-[contributor license agreement (CLA)](https://js.foundation/CLA/).
+Lodash is a member of the [JS Foundation](https://openjsf.org/).
+As such, we request that all contributors sign the JS Foundation
+[contributor license agreement (CLA)](https://cla.js.foundation/lodash/lodash).

 For more information about CLAs, please check out Alex Russell’s excellent post,
 [“Why Do I Need to Sign This?”](https://infrequently.org/2008/06/why-do-i-need-to-sign-this/).
@@ -61,18 +65,7 @@ established in the code.
  [JSDoc-style](http://www.2ality.com/2011/08/jsdoc-intro.html) comments for
  functions.

-Guidelines are enforced using [JSCS](https://www.npmjs.com/package/jscs):
+Guidelines are enforced using [ESLint](https://www.npmjs.com/package/eslint):
 ```bash
 $ npm run style
 ```
-
-## Tips
-
-You can opt-in to a pre-push git hook by adding an `.opt-in` file to the root of
-the project containing:
-```txt
-pre-push
-```
-
-With that, when you `git push`, the pre-push git hook will trigger and execute
-`npm run validate`.
--- a/.github/lock.yml
+++ b/.github/lock.yml
@@ -0,0 +1,24 @@
+# Configuration for lock-threads - https://github.com/dessant/lock-threads
+
+# Number of days of inactivity before a closed issue or pull request is locked
+daysUntilLock: 365
+
+# Skip issues and pull requests created before a given timestamp. Timestamp must
+# follow ISO 8601 (`YYYY-MM-DD`). Set to `false` to disable
+skipCreatedBefore: false
+
+# Issues and pull requests with these labels will not be locked. Set to `[]` to disable
+exemptLabels:
+  - votes needed
+
+# Label to add before locking, such as `outdated`. Set to `false` to disable
+lockLabel: false
+
+# Comment to post before locking. Set to `false` to disable
+lockComment: >
+  This thread has been automatically locked since there has not been
+  any recent activity after it was closed. Please open a new issue for
+  related bugs.
+
+# Assign `resolved` as the reason for locking. Set to `false` to disable
+setLockReason: true
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,16 @@
+name: CI
+on:
+  pull_request:
+    branches: [ main ]
+  push:
+    branches: [ main ]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: 1.0.2
+      - run: bun install
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,8 @@
 .DS_Store
-*.log
-doc/*.html
-node_modules
+*.log*
+dist/
+node_modules/
+*.code-workspace
+*.lockb
+*.sublime-project
+*.sublime-workspace
--- a/.husky/.gitignore
+++ b/.husky/.gitignore
@@ -0,0 +1 @@
+_
--- a/.husky/commit-msg
+++ b/.husky/commit-msg
@@ -0,0 +1,4 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+bun run commitlint --edit "$1"
--- a/.husky/pre-commit
+++ b/.husky/pre-commit
@@ -0,0 +1,4 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+bun run lint-staged
--- a/.jscsrc
+++ b/.jscsrc
@@ -1,97 +0,0 @@
-{
-  "maxErrors": "2000",
-  "maximumLineLength": {
-    "value": 180,
-    "allExcept": ["comments", "functionSignature", "regex"]
-  },
-  "requireCurlyBraces": [
-    "if",
-    "else",
-    "for",
-    "while",
-    "do",
-    "try",
-    "catch"
-  ],
-  "requireOperatorBeforeLineBreak": [
-    "=",
-    "+",
-    "-",
-    "/",
-    "*",
-    "==",
-    "===",
-    "!=",
-    "!==",
-    ">",
-    ">=",
-    "<",
-    "<="
-  ],
-  "requireSpaceAfterKeywords": [
-    "if",
-    "else",
-    "for",
-    "while",
-    "do",
-    "switch",
-    "return",
-    "try",
-    "catch"
-  ],
-  "requireSpaceBeforeBinaryOperators": [
-    "=", "+=", "-=", "*=", "/=", "%=", "<<=", ">>=", ">>>=",
-    "&=", "|=", "^=",
-
-    "+", "-", "*", "/", "%", "<<", ">>", ">>>", "&",
-    "|", "^", "&&", "||", "===", "==", ">=",
-    "<=", "<", ">", "!=", "!=="
-  ],
-  "requireSpacesInFunctionExpression": {
-    "beforeOpeningCurlyBrace": true
-  },
-  "requireCamelCaseOrUpperCaseIdentifiers": true,
-  "requireDotNotation": { "allExcept": ["keywords"] },
-  "requireEarlyReturn": true,
-  "requireLineFeedAtFileEnd": true,
-  "requireSemicolons": true,
-  "requireSpaceAfterBinaryOperators": true,
-  "requireSpacesInConditionalExpression": true,
-  "requireSpaceBeforeObjectValues": true,
-  "requireSpaceBeforeBlockStatements": true,
-  "requireSpacesInForStatement": true,
-
-  "validateIndentation": 2,
-  "validateParameterSeparator": ", ",
-  "validateQuoteMarks": { "mark": "'", "escape": true },
-
-  "disallowSpacesInAnonymousFunctionExpression": {
-    "beforeOpeningRoundBrace": true
-  },
-  "disallowSpacesInFunctionDeclaration": {
-    "beforeOpeningRoundBrace": true
-  },
-  "disallowSpacesInFunctionExpression": {
-    "beforeOpeningRoundBrace": true
-  },
-  "disallowKeywords": ["with"],
-  "disallowMixedSpacesAndTabs": true,
-  "disallowMultipleLineBreaks": true,
-  "disallowNewlineBeforeBlockStatements": true,
-  "disallowSpaceAfterObjectKeys": true,
-  "disallowSpaceAfterPrefixUnaryOperators": true,
-  "disallowSpacesInCallExpression": true,
-  "disallowSpacesInsideArrayBrackets": true,
-  "disallowSpacesInsideParentheses": true,
-  "disallowTrailingWhitespace": true,
-  "disallowUnusedVariables": true,
-
-  "jsDoc": {
-    "checkRedundantAccess": true,
-    "checkTypes": true,
-    "requireNewlineAfterDescription": true,
-    "requireParamDescription": true,
-    "requireParamTypes": true,
-    "requireReturnTypes": true
-  }
-}
--- a/.markdown-doctest-setup.js
+++ b/.markdown-doctest-setup.js
@@ -1,11 +0,0 @@
-'use strict';
-
-delete global['__core-js_shared__'];
-
-const _ = require('./lodash.js');
-const globals = require('lodash-doc-globals');
-
-module.exports = {
-  'babel': false,
-  'globals': _.assign({ '_': _ }, globals)
-};
--- a/.prettierignore
+++ b/.prettierignore
@@ -0,0 +1,5 @@
+coverage/
+coverage-merged/
+dist/
+node_modules/
+types/
--- a/.prettierrc
+++ b/.prettierrc
@@ -0,0 +1,6 @@
+{
+  "printWidth": 100,
+  "useTabs": false,
+  "tabWidth": 4,
+  "singleQuote": true
+}
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,135 +0,0 @@
-language: node_js
-sudo: false
-node_js:
-  - 7
-
-addons:
-  jwt:
-    secure: OYhRpW+8A0Iik+9GmHwa45ZwXeBXw/6zh6I+1w2H9g/LqPRp+Nhq3f4FSpvrrfno8lO8W4h+7s6+JOzF8C8NxNda5UUygKjF9pUphgiQdqls3YZMJlC9zXVl7gQXAHi3nG1s8vWSpwpzYD9fqczE1FX9n0+R63qX3eB6C/LbPeI=
-
-cache:
-  directories:
-    - ~/.npm
-    - ~/.yarn-cache
-    - travis_phantomjs
-
-env:
-  global:
-    - BIN=node ISTANBUL=false OPTION=""
-    - SAUCE_LABS=false SAUCE_USERNAME=lodash
-
-  matrix:
-    -
-    - BIN=phantomjs
-    - ISTANBUL=true
-    - SAUCE_LABS=true
-
-matrix:
-  include:
-    - node_js: 6
-      env:
-
-git:
-  depth: 10
-
-branches:
-  only:
-    - master
-    - 4.17
-
-notifications:
-  webhooks:
-    urls:
-      - https://webhooks.gitter.im/e/4aab6358b0e9aed0b628
-    on_success: change
-    on_failure: always
-
-before_install:
-  # Upgrade PhantomJS.
-  - |
-      export PHANTOMJS_VERSION=2.1.1
-      export PATH=$PWD/travis_phantomjs/phantomjs-$PHANTOMJS_VERSION-linux-x86_64/bin:$PATH
-      if [ $(phantomjs --version) != $PHANTOMJS_VERSION ]; then
-        rm -rf $PWD/travis_phantomjs
-        mkdir -p $PWD/travis_phantomjs
-        wget https://github.com/Medium/phantomjs/releases/download/v$PHANTOMJS_VERSION/phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2
-        tar -xvf phantomjs-$PHANTOMJS_VERSION-linux-x86_64.tar.bz2 -C $PWD/travis_phantomjs
-      fi
-      phantomjs -v
-
-  # Use exact Node version.
-  - nvm use $TRAVIS_NODE_VERSION
-
-  # Setup package managers.
-  - npm set loglevel error
-  - npm set progress false
-  - npm i -g yarn@0.16.1
-  - yarn -V
-
-  # Remove code skipped on the coverage run.
-  - |
-      PATTERN[0]="|\s*while\s*\([^)]+\)\s*\{\s*iteratee\(index\);\s*\}|"
-      PATTERN[1]="|\bindex,\s*iterable\)\s*===\s*false\)[^}]+?(break;)|"
-      PATTERN[2]="|\bcase\s+(?:dataView|promise|set|map|weakMap)CtorString:.+|g"
-      PATTERN[3]="|\s*if\s*\(cache\.size\b[\s\S]+?\}|"
-      PATTERN[4]="|\s*if\s*\(\!lodashFunc\)\s*\{\s*return;\s*\}|"
-      PATTERN[5]="|\s*define\([\s\S]+?\);|"
-      PATTERN[6]="|\s*root\._\s*=\s*_;|"
-
-      if [ $ISTANBUL = true ]; then
-        set -e
-        for PTRN in ${PATTERN[@]}; do
-          node ./test/remove.js $PTRN ./lodash.js
-        done
-      fi
-
-install:
-  # Install packages.
-  - yarn
-
-  # Use lodash-cli from GitHub. Temporarily use a fork.
-  - git clone --depth=10 --branch=master git://github.com/bnjmnt4n/lodash-cli ./node_modules/lodash-cli
-  - cd ./node_modules/lodash-cli/; npm i --production; cd ../../
-  - mkdir -p ./node_modules/lodash-cli/node_modules/lodash; cd $_; cp ../../../../lodash.js ./lodash.js; cp ../../../../package.json ./package.json; cd ../../../../
-
-script:
-  # Detect code coverage.
-  - |
-      if [ $ISTANBUL = true ]; then
-        istanbul cover -x "**/vendor/**" --report lcovonly ./test/test.js -- ./lodash.js
-        if [ $TRAVIS_SECURE_ENV_VARS = true ]; then
-          cat ./coverage/lcov.info | coveralls
-          cat ./coverage/coverage.json | codecov
-        fi
-      fi
-
-  # Test in Node.js and PhantomJS.
-  - |
-      if [ $ISTANBUL = false ]; then
-        node ./node_modules/lodash-cli/bin/lodash -o ./dist/lodash.js
-        node ./node_modules/lodash-cli/bin/lodash modularize exports=node -o ./
-        node ./node_modules/lodash-cli/bin/lodash -d -o ./lodash.js
-        if [ $SAUCE_LABS = false ]; then
-          cd ./test
-          $BIN $OPTION ./test.js ../lodash.js
-          if [ $TRAVIS_SECURE_ENV_VARS = true ]; then
-            $BIN $OPTION ./test.js ../dist/lodash.min.js
-          fi
-        fi
-      fi
-
-  # Test in Sauce Labs.
-  - |
-      if [ $SAUCE_LABS = true ]; then
-        node ./node_modules/lodash-cli/bin/lodash core -o ./dist/lodash.core.js
-        npm run build
-        $BIN ./test/saucelabs.js name="lodash tests"     runner="test/index.html?build=../dist/lodash.js&noglobals=true"     tags=development
-        $BIN ./test/saucelabs.js name="lodash tests"     runner="test/index.html?build=../dist/lodash.min.js&noglobals=true" tags=production
-        $BIN ./test/saucelabs.js name="lodash-fp tests"  runner="test/fp.html?noglobals=true"                                tags=development
-        $BIN ./test/saucelabs.js name="underscore tests" runner="test/underscore.html?build=../dist/lodash.js"               tags=development,underscore
-        $BIN ./test/saucelabs.js name="underscore tests" runner="test/underscore.html?build=../dist/lodash.min.js"           tags=production,underscore
-        $BIN ./test/saucelabs.js name="backbone tests"   runner="test/backbone.html?build=../dist/lodash.js"                 tags=development,backbone
-        $BIN ./test/saucelabs.js name="backbone tests"   runner="test/backbone.html?build=../dist/lodash.min.js"             tags=production,backbone
-        $BIN ./test/saucelabs.js name="backbone tests"   runner="test/backbone.html?build=../dist/lodash.core.js"            tags=development,backbone
-        $BIN ./test/saucelabs.js name="backbone tests"   runner="test/backbone.html?build=../dist/lodash.core.min.js"        tags=production,backbone
-      fi
--- a/4
+++ b/4
@@ -1,4 +1,6 @@
-Copyright OpenJS Foundation and other contributors <https://openjsf.org/>
+The MIT License
+
+Copyright JS Foundation and other contributors <https://js.foundation/>

 Based on Underscore.js, copyright Jeremy Ashkenas,
 DocumentCloud and Investigative Reporters & Editors <http://underscorejs.org/>
--- a/README.md
+++ b/README.md
@@ -1,30 +1,26 @@
-# lodash v4.17.21
+# lodash

 [Site](https://lodash.com/) |
 [Docs](https://lodash.com/docs) |
-[FP Guide](https://github.com/lodash/lodash/wiki/FP-Guide) |
 [Contributing](https://github.com/lodash/lodash/blob/master/.github/CONTRIBUTING.md) |
 [Wiki](https://github.com/lodash/lodash/wiki "Changelog, Roadmap, etc.") |
-[Code of Conduct](https://js.foundation/conduct/) |
-[Twitter](https://twitter.com/bestiejs) |
-[Chat](https://gitter.im/lodash/lodash)
+[Code of Conduct](https://code-of-conduct.openjsf.org)

 The [Lodash](https://lodash.com/) library exported as a [UMD](https://github.com/umdjs/umd) module.

-Generated using [lodash-cli](https://www.npmjs.com/package/lodash-cli):
 ```shell
-$ npm run build
+$ bun run build
 $ lodash -o ./dist/lodash.js
 $ lodash core -o ./dist/lodash.core.js
 ```

 ## Download

- * [Core build](https://raw.githubusercontent.com/lodash/lodash/4.17.21/dist/lodash.core.js) ([~4 kB gzipped](https://raw.githubusercontent.com/lodash/lodash/4.17.21/dist/lodash.core.min.js))
- * [Full build](https://raw.githubusercontent.com/lodash/lodash/4.17.21/dist/lodash.js) ([~24 kB gzipped](https://raw.githubusercontent.com/lodash/lodash/4.17.21/dist/lodash.min.js))
- * [CDN copies](https://www.jsdelivr.com/projects/lodash)
+ * [Core build](https://raw.githubusercontent.com/lodash/lodash/4.17.10-npm/core.js) ([~4 kB gzipped](https://raw.githubusercontent.com/lodash/lodash/4.17.10-npm/core.min.js))
+ * [Full build](https://raw.githubusercontent.com/lodash/lodash/4.17.10-npm/lodash.js) ([~24 kB gzipped](https://raw.githubusercontent.com/lodash/lodash/4.17.10-npm/lodash.min.js))
+ * [CDN copies](https://www.jsdelivr.com/projects/lodash) [![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/lodash/badge)](https://www.jsdelivr.com/package/npm/lodash)

-Lodash is released under the [MIT license](https://raw.githubusercontent.com/lodash/lodash/4.17.21/LICENSE) & supports modern environments.<br>
+Lodash is released under the [MIT license](https://raw.githubusercontent.com/lodash/lodash/4.17.10-npm/LICENSE) & supports modern environments.<br>
 Review the [build differences](https://github.com/lodash/lodash/wiki/build-differences) & pick one that’s right for you.

 ## Installation
@@ -34,13 +30,12 @@ In a browser:
 <script src="lodash.js"></script>
 ```

-Using npm:
+Using bun:
 ```shell
-$ npm i -g npm
-$ npm i --save lodash
+$ bun i lodash
 ```

-In Node.js:
+In [Bun](https://bun.sh):
 ```js
 // Load the full build.
 var _ = require('lodash');
@@ -58,8 +53,7 @@ var at = require('lodash/at');
 var curryN = require('lodash/fp/curryN');
 ```

-**Note:**<br>
-Install [n_](https://www.npmjs.com/package/n_) for Lodash use in the Node.js < 6 REPL.
+Looking for Lodash modules written in ES6 or smaller bundle sizes? Check out [lodash-es](https://www.npmjs.com/package/lodash-es).

 ## Why Lodash?

@@ -74,7 +68,5 @@ numbers, objects, strings, etc. Lodash’s modular methods are great for:

 Lodash is available in a [variety of builds](https://lodash.com/custom-builds) & module formats.

- * [lodash](https://www.npmjs.com/package/lodash) & [per method packages](https://www.npmjs.com/browse/keyword/lodash-modularized)
+ * [lodash](https://www.npmjs.com/package/lodash) & [per method packages](https://www.npmjs.com/search?q=keywords:lodash-modularized)
 * [lodash-es](https://www.npmjs.com/package/lodash-es), [babel-plugin-lodash](https://www.npmjs.com/package/babel-plugin-lodash), & [lodash-webpack-plugin](https://www.npmjs.com/package/lodash-webpack-plugin)
- * [lodash/fp](https://github.com/lodash/lodash/tree/npm/fp)
- * [lodash-amd](https://www.npmjs.com/package/lodash-amd)
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -0,0 +1,35 @@
+# Security Policy
+
+## Supported versions
+
+The following table describes the versions of this project that are currently
+supported with security updates:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 4.x   | :white_check_mark:   |
+| 3.x   | :x:                  |
+| 2.x   | :x:                  |
+| 1.x   | :x:                  |
+
+## Responsible disclosure security policy
+
+A responsible disclosure policy helps protect users of the project from publicly
+disclosed security vulnerabilities without a fix by employing a process where
+vulnerabilities are first triaged in a private manner, and only publicly disclosed
+after a reasonable time period that allows patching the vulnerability and provides
+an upgrade path for users.
+
+We kindly ask you to refrain from malicious acts that put our users, the project,
+or any of the project’s team members at risk.
+
+## Reporting a security issue
+
+We consider the security of Lodash a top priority. But no matter how much effort
+we put into security, there can still be vulnerabilities present.
+
+If you discover a security vulnerability, please report the security issue
+directly to the Lodash maintainers through the Security tab of the Lodash
+repository.
+
+Your efforts to responsibly disclose your findings are sincerely appreciated.
--- a/bunfig.toml
+++ b/bunfig.toml
@@ -0,0 +1,2 @@
+[install.lockfile]
+print = "yarn"
--- a/dist/lodash.core.js
+++ b/dist/lodash.core.js
--- a/dist/lodash.core.min.js
+++ b/dist/lodash.core.min.js
@@ -1,29 +0,0 @@
-/**
- * @license
- * Lodash (Custom Build) lodash.com/license | Underscore.js 1.8.3 underscorejs.org/LICENSE
- * Build: `lodash core -o ./dist/lodash.core.js`
- */
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-	  'assocPath': 'set',
-	  'complement': 'negate',
-	  'compose': 'flowRight',
-	  'contains': 'includes',
-	  'dissoc': 'unset',
-	  'dissocPath': 'unset',
-	  'dropLast': 'dropRight',
-	  'dropLastWhile': 'dropRightWhile',
-	  'equals': 'isEqual',
-	  'identical': 'eq',
-	  'indexBy': 'keyBy',
-	  'init': 'initial',
-	  'invertObj': 'invert',
-	  'juxt': 'over',
-	  'omitAll': 'omit',
-	  'nAry': 'ary',
-	  'path': 'get',
-	  'pathEq': 'matchesProperty',
-	  'pathOr': 'getOr',
-	  'paths': 'at',
-	  'pickAll': 'pick',
-	  'pipe': 'flow',
-	  'pluck': 'map',
-	  'prop': 'get',
-	  'propEq': 'matchesProperty',
-	  'propOr': 'getOr',
-	  'props': 'at',
-	  'symmetricDifference': 'xor',
-	  'symmetricDifferenceBy': 'xorBy',
-	  'symmetricDifferenceWith': 'xorWith',
-	  'takeLast': 'takeRight',
-	  'takeLastWhile': 'takeRightWhile',
-	  'unapply': 'rest',
-	  'unnest': 'flatten',
-	  'useWith': 'overArgs',
-	  'where': 'conformsTo',
-	  'whereEq': 'isMatch',
-	  'zipObj': 'zipObject'
-	};
-
-	/** Used to map ary to method names. */
-	exports.aryMethod = {
-	  '1': [
-	    'assignAll', 'assignInAll', 'attempt', 'castArray', 'ceil', 'create',
-	    'curry', 'curryRight', 'defaultsAll', 'defaultsDeepAll', 'floor', 'flow',
-	    'flowRight', 'fromPairs', 'invert', 'iteratee', 'memoize', 'method', 'mergeAll',
-	    'methodOf', 'mixin', 'nthArg', 'over', 'overEvery', 'overSome','rest', 'reverse',
-	    'round', 'runInContext', 'spread', 'template', 'trim', 'trimEnd', 'trimStart',
-	    'uniqueId', 'words', 'zipAll'
-	  ],
-	  '2': [
-	    'add', 'after', 'ary', 'assign', 'assignAllWith', 'assignIn', 'assignInAllWith',
-	    'at', 'before', 'bind', 'bindAll', 'bindKey', 'chunk', 'cloneDeepWith',
-	    'cloneWith', 'concat', 'conformsTo', 'countBy', 'curryN', 'curryRightN',
-	    'debounce', 'defaults', 'defaultsDeep', 'defaultTo', 'delay', 'difference',
-	    'divide', 'drop', 'dropRight', 'dropRightWhile', 'dropWhile', 'endsWith', 'eq',
-	    'every', 'filter', 'find', 'findIndex', 'findKey', 'findLast', 'findLastIndex',
-	    'findLastKey', 'flatMap', 'flatMapDeep', 'flattenDepth', 'forEach',
-	    'forEachRight', 'forIn', 'forInRight', 'forOwn', 'forOwnRight', 'get',
-	    'groupBy', 'gt', 'gte', 'has', 'hasIn', 'includes', 'indexOf', 'intersection',
-	    'invertBy', 'invoke', 'invokeMap', 'isEqual', 'isMatch', 'join', 'keyBy',
-	    'lastIndexOf', 'lt', 'lte', 'map', 'mapKeys', 'mapValues', 'matchesProperty',
-	    'maxBy', 'meanBy', 'merge', 'mergeAllWith', 'minBy', 'multiply', 'nth', 'omit',
-	    'omitBy', 'overArgs', 'pad', 'padEnd', 'padStart', 'parseInt', 'partial',
-	    'partialRight', 'partition', 'pick', 'pickBy', 'propertyOf', 'pull', 'pullAll',
-	    'pullAt', 'random', 'range', 'rangeRight', 'rearg', 'reject', 'remove',
-	    'repeat', 'restFrom', 'result', 'sampleSize', 'some', 'sortBy', 'sortedIndex',
-	    'sortedIndexOf', 'sortedLastIndex', 'sortedLastIndexOf', 'sortedUniqBy',
-	    'split', 'spreadFrom', 'startsWith', 'subtract', 'sumBy', 'take', 'takeRight',
-	    'takeRightWhile', 'takeWhile', 'tap', 'throttle', 'thru', 'times', 'trimChars',
-	    'trimCharsEnd', 'trimCharsStart', 'truncate', 'union', 'uniqBy', 'uniqWith',
-	    'unset', 'unzipWith', 'without', 'wrap', 'xor', 'zip', 'zipObject',
-	    'zipObjectDeep'
-	  ],
-	  '3': [
-	    'assignInWith', 'assignWith', 'clamp', 'differenceBy', 'differenceWith',
-	    'findFrom', 'findIndexFrom', 'findLastFrom', 'findLastIndexFrom', 'getOr',
-	    'includesFrom', 'indexOfFrom', 'inRange', 'intersectionBy', 'intersectionWith',
-	    'invokeArgs', 'invokeArgsMap', 'isEqualWith', 'isMatchWith', 'flatMapDepth',
-	    'lastIndexOfFrom', 'mergeWith', 'orderBy', 'padChars', 'padCharsEnd',
-	    'padCharsStart', 'pullAllBy', 'pullAllWith', 'rangeStep', 'rangeStepRight',
-	    'reduce', 'reduceRight', 'replace', 'set', 'slice', 'sortedIndexBy',
-	    'sortedLastIndexBy', 'transform', 'unionBy', 'unionWith', 'update', 'xorBy',
-	    'xorWith', 'zipWith'
-	  ],
-	  '4': [
-	    'fill', 'setWith', 'updateWith'
-	  ]
-	};
-
-	/** Used to map ary to rearg configs. */
-	exports.aryRearg = {
-	  '2': [1, 0],
-	  '3': [2, 0, 1],
-	  '4': [3, 2, 0, 1]
-	};
-
-	/** Used to map method names to their iteratee ary. */
-	exports.iterateeAry = {
-	  'dropRightWhile': 1,
-	  'dropWhile': 1,
-	  'every': 1,
-	  'filter': 1,
-	  'find': 1,
-	  'findFrom': 1,
-	  'findIndex': 1,
-	  'findIndexFrom': 1,
-	  'findKey': 1,
-	  'findLast': 1,
-	  'findLastFrom': 1,
-	  'findLastIndex': 1,
-	  'findLastIndexFrom': 1,
-	  'findLastKey': 1,
-	  'flatMap': 1,
-	  'flatMapDeep': 1,
-	  'flatMapDepth': 1,
-	  'forEach': 1,
-	  'forEachRight': 1,
-	  'forIn': 1,
-	  'forInRight': 1,
-	  'forOwn': 1,
-	  'forOwnRight': 1,
-	  'map': 1,
-	  'mapKeys': 1,
-	  'mapValues': 1,
-	  'partition': 1,
-	  'reduce': 2,
-	  'reduceRight': 2,
-	  'reject': 1,
-	  'remove': 1,
-	  'some': 1,
-	  'takeRightWhile': 1,
-	  'takeWhile': 1,
-	  'times': 1,
-	  'transform': 2
-	};
-
-	/** Used to map method names to iteratee rearg configs. */
-	exports.iterateeRearg = {
-	  'mapKeys': [1],
-	  'reduceRight': [1, 0]
-	};
-
-	/** Used to map method names to rearg configs. */
-	exports.methodRearg = {
-	  'assignInAllWith': [1, 0],
-	  'assignInWith': [1, 2, 0],
-	  'assignAllWith': [1, 0],
-	  'assignWith': [1, 2, 0],
-	  'differenceBy': [1, 2, 0],
-	  'differenceWith': [1, 2, 0],
-	  'getOr': [2, 1, 0],
-	  'intersectionBy': [1, 2, 0],
-	  'intersectionWith': [1, 2, 0],
-	  'isEqualWith': [1, 2, 0],
-	  'isMatchWith': [2, 1, 0],
-	  'mergeAllWith': [1, 0],
-	  'mergeWith': [1, 2, 0],
-	  'padChars': [2, 1, 0],
-	  'padCharsEnd': [2, 1, 0],
-	  'padCharsStart': [2, 1, 0],
-	  'pullAllBy': [2, 1, 0],
-	  'pullAllWith': [2, 1, 0],
-	  'rangeStep': [1, 2, 0],
-	  'rangeStepRight': [1, 2, 0],
-	  'setWith': [3, 1, 2, 0],
-	  'sortedIndexBy': [2, 1, 0],
-	  'sortedLastIndexBy': [2, 1, 0],
-	  'unionBy': [1, 2, 0],
-	  'unionWith': [1, 2, 0],
-	  'updateWith': [3, 1, 2, 0],
-	  'xorBy': [1, 2, 0],
-	  'xorWith': [1, 2, 0],
-	  'zipWith': [1, 2, 0]
-	};
-
-	/** Used to map method names to spread configs. */
-	exports.methodSpread = {
-	  'assignAll': { 'start': 0 },
-	  'assignAllWith': { 'start': 0 },
-	  'assignInAll': { 'start': 0 },
-	  'assignInAllWith': { 'start': 0 },
-	  'defaultsAll': { 'start': 0 },
-	  'defaultsDeepAll': { 'start': 0 },
-	  'invokeArgs': { 'start': 2 },
-	  'invokeArgsMap': { 'start': 2 },
-	  'mergeAll': { 'start': 0 },
-	  'mergeAllWith': { 'start': 0 },
-	  'partial': { 'start': 1 },
-	  'partialRight': { 'start': 1 },
-	  'without': { 'start': 1 },
-	  'zipAll': { 'start': 0 }
-	};
-
-	/** Used to identify methods which mutate arrays or objects. */
-	exports.mutate = {
-	  'array': {
-	    'fill': true,
-	    'pull': true,
-	    'pullAll': true,
-	    'pullAllBy': true,
-	    'pullAllWith': true,
-	    'pullAt': true,
-	    'remove': true,
-	    'reverse': true
-	  },
-	  'object': {
-	    'assign': true,
-	    'assignAll': true,
-	    'assignAllWith': true,
-	    'assignIn': true,
-	    'assignInAll': true,
-	    'assignInAllWith': true,
-	    'assignInWith': true,
-	    'assignWith': true,
-	    'defaults': true,
-	    'defaultsAll': true,
-	    'defaultsDeep': true,
-	    'defaultsDeepAll': true,
-	    'merge': true,
-	    'mergeAll': true,
-	    'mergeAllWith': true,
-	    'mergeWith': true,
-	  },
-	  'set': {
-	    'set': true,
-	    'setWith': true,
-	    'unset': true,
-	    'update': true,
-	    'updateWith': true
-	  }
-	};
-
-	/** Used to map real names to their aliases. */
-	exports.realToAlias = (function() {
-	  var hasOwnProperty = Object.prototype.hasOwnProperty,
-	      object = exports.aliasToReal,
-	      result = {};
-
-	  for (var key in object) {
-	    var value = object[key];
-	    if (hasOwnProperty.call(result, value)) {
-	      result[value].push(key);
-	    } else {
-	      result[value] = [key];
-	    }
-	  }
-	  return result;
-	}());
-
-	/** Used to map method names to other names. */
-	exports.remap = {
-	  'assignAll': 'assign',
-	  'assignAllWith': 'assignWith',
-	  'assignInAll': 'assignIn',
-	  'assignInAllWith': 'assignInWith',
-	  'curryN': 'curry',
-	  'curryRightN': 'curryRight',
-	  'defaultsAll': 'defaults',
-	  'defaultsDeepAll': 'defaultsDeep',
-	  'findFrom': 'find',
-	  'findIndexFrom': 'findIndex',
-	  'findLastFrom': 'findLast',
-	  'findLastIndexFrom': 'findLastIndex',
-	  'getOr': 'get',
-	  'includesFrom': 'includes',
-	  'indexOfFrom': 'indexOf',
-	  'invokeArgs': 'invoke',
-	  'invokeArgsMap': 'invokeMap',
-	  'lastIndexOfFrom': 'lastIndexOf',
-	  'mergeAll': 'merge',
-	  'mergeAllWith': 'mergeWith',
-	  'padChars': 'pad',
-	  'padCharsEnd': 'padEnd',
-	  'padCharsStart': 'padStart',
-	  'propertyOf': 'get',
-	  'rangeStep': 'range',
-	  'rangeStepRight': 'rangeRight',
-	  'restFrom': 'rest',
-	  'spreadFrom': 'spread',
-	  'trimChars': 'trim',
-	  'trimCharsEnd': 'trimEnd',
-	  'trimCharsStart': 'trimStart',
-	  'zipAll': 'zip'
-	};
-
-	/** Used to track methods that skip fixing their arity. */
-	exports.skipFixed = {
-	  'castArray': true,
-	  'flow': true,
-	  'flowRight': true,
-	  'iteratee': true,
-	  'mixin': true,
-	  'rearg': true,
-	  'runInContext': true
-	};
-
-	/** Used to track methods that skip rearranging arguments. */
-	exports.skipRearg = {
-	  'add': true,
-	  'assign': true,
-	  'assignIn': true,
-	  'bind': true,
-	  'bindKey': true,
-	  'concat': true,
-	  'difference': true,
-	  'divide': true,
-	  'eq': true,
-	  'gt': true,
-	  'gte': true,
-	  'isEqual': true,
-	  'lt': true,
-	  'lte': true,
-	  'matchesProperty': true,
-	  'merge': true,
-	  'multiply': true,
-	  'overArgs': true,
-	  'partial': true,
-	  'partialRight': true,
-	  'propertyOf': true,
-	  'random': true,
-	  'range': true,
-	  'rangeRight': true,
-	  'subtract': true,
-	  'zip': true,
-	  'zipObject': true,
-	  'zipObjectDeep': true
-	};
-
-
-/***/ })
-/******/ ])
-});
-;
--- a/doc/README.md
+++ b/doc/README.md
--- a/fp/_baseConvert.js
+++ b/fp/_baseConvert.js
@@ -1,569 +0,0 @@
-var mapping = require('./_mapping'),
-    fallbackHolder = require('./placeholder');
-
-/** Built-in value reference. */
-var push = Array.prototype.push;
-
-/**
- * Creates a function, with an arity of `n`, that invokes `func` with the
- * arguments it receives.
- *
- * @private
- * @param {Function} func The function to wrap.
- * @param {number} n The arity of the new function.
- * @returns {Function} Returns the new function.
- */
-function baseArity(func, n) {
-  return n == 2
-    ? function(a, b) { return func.apply(undefined, arguments); }
-    : function(a) { return func.apply(undefined, arguments); };
-}
-
-/**
- * Creates a function that invokes `func`, with up to `n` arguments, ignoring
- * any additional arguments.
- *
- * @private
- * @param {Function} func The function to cap arguments for.
- * @param {number} n The arity cap.
- * @returns {Function} Returns the new function.
- */
-function baseAry(func, n) {
-  return n == 2
-    ? function(a, b) { return func(a, b); }
-    : function(a) { return func(a); };
-}
-
-/**
- * Creates a clone of `array`.
- *
- * @private
- * @param {Array} array The array to clone.
- * @returns {Array} Returns the cloned array.
- */
-function cloneArray(array) {
-  var length = array ? array.length : 0,
-      result = Array(length);
-
-  while (length--) {
-    result[length] = array[length];
-  }
-  return result;
-}
-
-/**
- * Creates a function that clones a given object using the assignment `func`.
- *
- * @private
- * @param {Function} func The assignment function.
- * @returns {Function} Returns the new cloner function.
- */
-function createCloner(func) {
-  return function(object) {
-    return func({}, object);
-  };
-}
-
-/**
- * A specialized version of `_.spread` which flattens the spread array into
- * the arguments of the invoked `func`.
- *
- * @private
- * @param {Function} func The function to spread arguments over.
- * @param {number} start The start position of the spread.
- * @returns {Function} Returns the new function.
- */
-function flatSpread(func, start) {
-  return function() {
-    var length = arguments.length,
-        lastIndex = length - 1,
-        args = Array(length);
-
-    while (length--) {
-      args[length] = arguments[length];
-    }
-    var array = args[start],
-        otherArgs = args.slice(0, start);
-
-    if (array) {
-      push.apply(otherArgs, array);
-    }
-    if (start != lastIndex) {
-      push.apply(otherArgs, args.slice(start + 1));
-    }
-    return func.apply(this, otherArgs);
-  };
-}
-
-/**
- * Creates a function that wraps `func` and uses `cloner` to clone the first
- * argument it receives.
- *
- * @private
- * @param {Function} func The function to wrap.
- * @param {Function} cloner The function to clone arguments.
- * @returns {Function} Returns the new immutable function.
- */
-function wrapImmutable(func, cloner) {
-  return function() {
-    var length = arguments.length;
-    if (!length) {
-      return;
-    }
-    var args = Array(length);
-    while (length--) {
-      args[length] = arguments[length];
-    }
-    var result = args[0] = cloner.apply(undefined, args);
-    func.apply(undefined, args);
-    return result;
-  };
-}
-
-/**
- * The base implementation of `convert` which accepts a `util` object of methods
- * required to perform conversions.
- *
- * @param {Object} util The util object.
- * @param {string} name The name of the function to convert.
- * @param {Function} func The function to convert.
- * @param {Object} [options] The options object.
- * @param {boolean} [options.cap=true] Specify capping iteratee arguments.
- * @param {boolean} [options.curry=true] Specify currying.
- * @param {boolean} [options.fixed=true] Specify fixed arity.
- * @param {boolean} [options.immutable=true] Specify immutable operations.
- * @param {boolean} [options.rearg=true] Specify rearranging arguments.
- * @returns {Function|Object} Returns the converted function or object.
- */
-function baseConvert(util, name, func, options) {
-  var isLib = typeof name == 'function',
-      isObj = name === Object(name);
-
-  if (isObj) {
-    options = func;
-    func = name;
-    name = undefined;
-  }
-  if (func == null) {
-    throw new TypeError;
-  }
-  options || (options = {});
-
-  var config = {
-    'cap': 'cap' in options ? options.cap : true,
-    'curry': 'curry' in options ? options.curry : true,
-    'fixed': 'fixed' in options ? options.fixed : true,
-    'immutable': 'immutable' in options ? options.immutable : true,
-    'rearg': 'rearg' in options ? options.rearg : true
-  };
-
-  var defaultHolder = isLib ? func : fallbackHolder,
-      forceCurry = ('curry' in options) && options.curry,
-      forceFixed = ('fixed' in options) && options.fixed,
-      forceRearg = ('rearg' in options) && options.rearg,
-      pristine = isLib ? func.runInContext() : undefined;
-
-  var helpers = isLib ? func : {
-    'ary': util.ary,
-    'assign': util.assign,
-    'clone': util.clone,
-    'curry': util.curry,
-    'forEach': util.forEach,
-    'isArray': util.isArray,
-    'isError': util.isError,
-    'isFunction': util.isFunction,
-    'isWeakMap': util.isWeakMap,
-    'iteratee': util.iteratee,
-    'keys': util.keys,
-    'rearg': util.rearg,
-    'toInteger': util.toInteger,
-    'toPath': util.toPath
-  };
-
-  var ary = helpers.ary,
-      assign = helpers.assign,
-      clone = helpers.clone,
-      curry = helpers.curry,
-      each = helpers.forEach,
-      isArray = helpers.isArray,
-      isError = helpers.isError,
-      isFunction = helpers.isFunction,
-      isWeakMap = helpers.isWeakMap,
-      keys = helpers.keys,
-      rearg = helpers.rearg,
-      toInteger = helpers.toInteger,
-      toPath = helpers.toPath;
-
-  var aryMethodKeys = keys(mapping.aryMethod);
-
-  var wrappers = {
-    'castArray': function(castArray) {
-      return function() {
-        var value = arguments[0];
-        return isArray(value)
-          ? castArray(cloneArray(value))
-          : castArray.apply(undefined, arguments);
-      };
-    },
-    'iteratee': function(iteratee) {
-      return function() {
-        var func = arguments[0],
-            arity = arguments[1],
-            result = iteratee(func, arity),
-            length = result.length;
-
-        if (config.cap && typeof arity == 'number') {
-          arity = arity > 2 ? (arity - 2) : 1;
-          return (length && length <= arity) ? result : baseAry(result, arity);
-        }
-        return result;
-      };
-    },
-    'mixin': function(mixin) {
-      return function(source) {
-        var func = this;
-        if (!isFunction(func)) {
-          return mixin(func, Object(source));
-        }
-        var pairs = [];
-        each(keys(source), function(key) {
-          if (isFunction(source[key])) {
-            pairs.push([key, func.prototype[key]]);
-          }
-        });
-
-        mixin(func, Object(source));
-
-        each(pairs, function(pair) {
-          var value = pair[1];
-          if (isFunction(value)) {
-            func.prototype[pair[0]] = value;
-          } else {
-            delete func.prototype[pair[0]];
-          }
-        });
-        return func;
-      };
-    },
-    'nthArg': function(nthArg) {
-      return function(n) {
-        var arity = n < 0 ? 1 : (toInteger(n) + 1);
-        return curry(nthArg(n), arity);
-      };
-    },
-    'rearg': function(rearg) {
-      return function(func, indexes) {
-        var arity = indexes ? indexes.length : 0;
-        return curry(rearg(func, indexes), arity);
-      };
-    },
-    'runInContext': function(runInContext) {
-      return function(context) {
-        return baseConvert(util, runInContext(context), options);
-      };
-    }
-  };
-
-  /*--------------------------------------------------------------------------*/
-
-  /**
-   * Casts `func` to a function with an arity capped iteratee if needed.
-   *
-   * @private
-   * @param {string} name The name of the function to inspect.
-   * @param {Function} func The function to inspect.
-   * @returns {Function} Returns the cast function.
-   */
-  function castCap(name, func) {
-    if (config.cap) {
-      var indexes = mapping.iterateeRearg[name];
-      if (indexes) {
-        return iterateeRearg(func, indexes);
-      }
-      var n = !isLib && mapping.iterateeAry[name];
-      if (n) {
-        return iterateeAry(func, n);
-      }
-    }
-    return func;
-  }
-
-  /**
-   * Casts `func` to a curried function if needed.
-   *
-   * @private
-   * @param {string} name The name of the function to inspect.
-   * @param {Function} func The function to inspect.
-   * @param {number} n The arity of `func`.
-   * @returns {Function} Returns the cast function.
-   */
-  function castCurry(name, func, n) {
-    return (forceCurry || (config.curry && n > 1))
-      ? curry(func, n)
-      : func;
-  }
-
-  /**
-   * Casts `func` to a fixed arity function if needed.
-   *
-   * @private
-   * @param {string} name The name of the function to inspect.
-   * @param {Function} func The function to inspect.
-   * @param {number} n The arity cap.
-   * @returns {Function} Returns the cast function.
-   */
-  function castFixed(name, func, n) {
-    if (config.fixed && (forceFixed || !mapping.skipFixed[name])) {
-      var data = mapping.methodSpread[name],
-          start = data && data.start;
-
-      return start  === undefined ? ary(func, n) : flatSpread(func, start);
-    }
-    return func;
-  }
-
-  /**
-   * Casts `func` to an rearged function if needed.
-   *
-   * @private
-   * @param {string} name The name of the function to inspect.
-   * @param {Function} func The function to inspect.
-   * @param {number} n The arity of `func`.
-   * @returns {Function} Returns the cast function.
-   */
-  function castRearg(name, func, n) {
-    return (config.rearg && n > 1 && (forceRearg || !mapping.skipRearg[name]))
-      ? rearg(func, mapping.methodRearg[name] || mapping.aryRearg[n])
-      : func;
-  }
-
-  /**
-   * Creates a clone of `object` by `path`.
-   *
-   * @private
-   * @param {Object} object The object to clone.
-   * @param {Array|string} path The path to clone by.
-   * @returns {Object} Returns the cloned object.
-   */
-  function cloneByPath(object, path) {
-    path = toPath(path);
-
-    var index = -1,
-        length = path.length,
-        lastIndex = length - 1,
-        result = clone(Object(object)),
-        nested = result;
-
-    while (nested != null && ++index < length) {
-      var key = path[index],
-          value = nested[key];
-
-      if (value != null &&
-          !(isFunction(value) || isError(value) || isWeakMap(value))) {
-        nested[key] = clone(index == lastIndex ? value : Object(value));
-      }
-      nested = nested[key];
-    }
-    return result;
-  }
-
-  /**
-   * Converts `lodash` to an immutable auto-curried iteratee-first data-last
-   * version with conversion `options` applied.
-   *
-   * @param {Object} [options] The options object. See `baseConvert` for more details.
-   * @returns {Function} Returns the converted `lodash`.
-   */
-  function convertLib(options) {
-    return _.runInContext.convert(options)(undefined);
-  }
-
-  /**
-   * Create a converter function for `func` of `name`.
-   *
-   * @param {string} name The name of the function to convert.
-   * @param {Function} func The function to convert.
-   * @returns {Function} Returns the new converter function.
-   */
-  function createConverter(name, func) {
-    var realName = mapping.aliasToReal[name] || name,
-        methodName = mapping.remap[realName] || realName,
-        oldOptions = options;
-
-    return function(options) {
-      var newUtil = isLib ? pristine : helpers,
-          newFunc = isLib ? pristine[methodName] : func,
-          newOptions = assign(assign({}, oldOptions), options);
-
-      return baseConvert(newUtil, realName, newFunc, newOptions);
-    };
-  }
-
-  /**
-   * Creates a function that wraps `func` to invoke its iteratee, with up to `n`
-   * arguments, ignoring any additional arguments.
-   *
-   * @private
-   * @param {Function} func The function to cap iteratee arguments for.
-   * @param {number} n The arity cap.
-   * @returns {Function} Returns the new function.
-   */
-  function iterateeAry(func, n) {
-    return overArg(func, function(func) {
-      return typeof func == 'function' ? baseAry(func, n) : func;
-    });
-  }
-
-  /**
-   * Creates a function that wraps `func` to invoke its iteratee with arguments
-   * arranged according to the specified `indexes` where the argument value at
-   * the first index is provided as the first argument, the argument value at
-   * the second index is provided as the second argument, and so on.
-   *
-   * @private
-   * @param {Function} func The function to rearrange iteratee arguments for.
-   * @param {number[]} indexes The arranged argument indexes.
-   * @returns {Function} Returns the new function.
-   */
-  function iterateeRearg(func, indexes) {
-    return overArg(func, function(func) {
-      var n = indexes.length;
-      return baseArity(rearg(baseAry(func, n), indexes), n);
-    });
-  }
-
-  /**
-   * Creates a function that invokes `func` with its first argument transformed.
-   *
-   * @private
-   * @param {Function} func The function to wrap.
-   * @param {Function} transform The argument transform.
-   * @returns {Function} Returns the new function.
-   */
-  function overArg(func, transform) {
-    return function() {
-      var length = arguments.length;
-      if (!length) {
-        return func();
-      }
-      var args = Array(length);
-      while (length--) {
-        args[length] = arguments[length];
-      }
-      var index = config.rearg ? 0 : (length - 1);
-      args[index] = transform(args[index]);
-      return func.apply(undefined, args);
-    };
-  }
-
-  /**
-   * Creates a function that wraps `func` and applys the conversions
-   * rules by `name`.
-   *
-   * @private
-   * @param {string} name The name of the function to wrap.
-   * @param {Function} func The function to wrap.
-   * @returns {Function} Returns the converted function.
-   */
-  function wrap(name, func, placeholder) {
-    var result,
-        realName = mapping.aliasToReal[name] || name,
-        wrapped = func,
-        wrapper = wrappers[realName];
-
-    if (wrapper) {
-      wrapped = wrapper(func);
-    }
-    else if (config.immutable) {
-      if (mapping.mutate.array[realName]) {
-        wrapped = wrapImmutable(func, cloneArray);
-      }
-      else if (mapping.mutate.object[realName]) {
-        wrapped = wrapImmutable(func, createCloner(func));
-      }
-      else if (mapping.mutate.set[realName]) {
-        wrapped = wrapImmutable(func, cloneByPath);
-      }
-    }
-    each(aryMethodKeys, function(aryKey) {
-      each(mapping.aryMethod[aryKey], function(otherName) {
-        if (realName == otherName) {
-          var data = mapping.methodSpread[realName],
-              afterRearg = data && data.afterRearg;
-
-          result = afterRearg
-            ? castFixed(realName, castRearg(realName, wrapped, aryKey), aryKey)
-            : castRearg(realName, castFixed(realName, wrapped, aryKey), aryKey);
-
-          result = castCap(realName, result);
-          result = castCurry(realName, result, aryKey);
-          return false;
-        }
-      });
-      return !result;
-    });
-
-    result || (result = wrapped);
-    if (result == func) {
-      result = forceCurry ? curry(result, 1) : function() {
-        return func.apply(this, arguments);
-      };
-    }
-    result.convert = createConverter(realName, func);
-    result.placeholder = func.placeholder = placeholder;
-
-    return result;
-  }
-
-  /*--------------------------------------------------------------------------*/
-
-  if (!isObj) {
-    return wrap(name, func, defaultHolder);
-  }
-  var _ = func;
-
-  // Convert methods by ary cap.
-  var pairs = [];
-  each(aryMethodKeys, function(aryKey) {
-    each(mapping.aryMethod[aryKey], function(key) {
-      var func = _[mapping.remap[key] || key];
-      if (func) {
-        pairs.push([key, wrap(key, func, _)]);
-      }
-    });
-  });
-
-  // Convert remaining methods.
-  each(keys(_), function(key) {
-    var func = _[key];
-    if (typeof func == 'function') {
-      var length = pairs.length;
-      while (length--) {
-        if (pairs[length][0] == key) {
-          return;
-        }
-      }
-      func.convert = createConverter(key, func);
-      pairs.push([key, func]);
-    }
-  });
-
-  // Assign to `_` leaving `_.prototype` unchanged to allow chaining.
-  each(pairs, function(pair) {
-    _[pair[0]] = pair[1];
-  });
-
-  _.convert = convertLib;
-  _.placeholder = _;
-
-  // Assign aliases.
-  each(keys(_), function(key) {
-    each(mapping.realToAlias[key] || [], function(alias) {
-      _[alias] = _[key];
-    });
-  });
-
-  return _;
-}
-
-module.exports = baseConvert;
--- a/fp/_convertBrowser.js
+++ b/fp/_convertBrowser.js
@@ -1,18 +0,0 @@
-var baseConvert = require('./_baseConvert');
-
-/**
- * Converts `lodash` to an immutable auto-curried iteratee-first data-last
- * version with conversion `options` applied.
- *
- * @param {Function} lodash The lodash function to convert.
- * @param {Object} [options] The options object. See `baseConvert` for more details.
- * @returns {Function} Returns the converted `lodash`.
- */
-function browserConvert(lodash, options) {
-  return baseConvert(lodash, lodash, options);
-}
-
-if (typeof _ == 'function' && typeof _.runInContext == 'function') {
-  _ = browserConvert(_.runInContext());
-}
-module.exports = browserConvert;
--- a/fp/_mapping.js
+++ b/fp/_mapping.js
@@ -1,358 +0,0 @@
-/** Used to map aliases to their real names. */
-exports.aliasToReal = {
-
-  // Lodash aliases.
-  'each': 'forEach',
-  'eachRight': 'forEachRight',
-  'entries': 'toPairs',
-  'entriesIn': 'toPairsIn',
-  'extend': 'assignIn',
-  'extendAll': 'assignInAll',
-  'extendAllWith': 'assignInAllWith',
-  'extendWith': 'assignInWith',
-  'first': 'head',
-
-  // Methods that are curried variants of others.
-  'conforms': 'conformsTo',
-  'matches': 'isMatch',
-  'property': 'get',
-
-  // Ramda aliases.
-  '__': 'placeholder',
-  'F': 'stubFalse',
-  'T': 'stubTrue',
-  'all': 'every',
-  'allPass': 'overEvery',
-  'always': 'constant',
-  'any': 'some',
-  'anyPass': 'overSome',
-  'apply': 'spread',
-  'assoc': 'set',
-  'assocPath': 'set',
-  'complement': 'negate',
-  'compose': 'flowRight',
-  'contains': 'includes',
-  'dissoc': 'unset',
-  'dissocPath': 'unset',
-  'dropLast': 'dropRight',
-  'dropLastWhile': 'dropRightWhile',
-  'equals': 'isEqual',
-  'identical': 'eq',
-  'indexBy': 'keyBy',
-  'init': 'initial',
-  'invertObj': 'invert',
-  'juxt': 'over',
-  'omitAll': 'omit',
-  'nAry': 'ary',
-  'path': 'get',
-  'pathEq': 'matchesProperty',
-  'pathOr': 'getOr',
-  'paths': 'at',
-  'pickAll': 'pick',
-  'pipe': 'flow',
-  'pluck': 'map',
-  'prop': 'get',
-  'propEq': 'matchesProperty',
-  'propOr': 'getOr',
-  'props': 'at',
-  'symmetricDifference': 'xor',
-  'symmetricDifferenceBy': 'xorBy',
-  'symmetricDifferenceWith': 'xorWith',
-  'takeLast': 'takeRight',
-  'takeLastWhile': 'takeRightWhile',
-  'unapply': 'rest',
-  'unnest': 'flatten',
-  'useWith': 'overArgs',
-  'where': 'conformsTo',
-  'whereEq': 'isMatch',
-  'zipObj': 'zipObject'
-};
-
-/** Used to map ary to method names. */
-exports.aryMethod = {
-  '1': [
-    'assignAll', 'assignInAll', 'attempt', 'castArray', 'ceil', 'create',
-    'curry', 'curryRight', 'defaultsAll', 'defaultsDeepAll', 'floor', 'flow',
-    'flowRight', 'fromPairs', 'invert', 'iteratee', 'memoize', 'method', 'mergeAll',
-    'methodOf', 'mixin', 'nthArg', 'over', 'overEvery', 'overSome','rest', 'reverse',
-    'round', 'runInContext', 'spread', 'template', 'trim', 'trimEnd', 'trimStart',
-    'uniqueId', 'words', 'zipAll'
-  ],
-  '2': [
-    'add', 'after', 'ary', 'assign', 'assignAllWith', 'assignIn', 'assignInAllWith',
-    'at', 'before', 'bind', 'bindAll', 'bindKey', 'chunk', 'cloneDeepWith',
-    'cloneWith', 'concat', 'conformsTo', 'countBy', 'curryN', 'curryRightN',
-    'debounce', 'defaults', 'defaultsDeep', 'defaultTo', 'delay', 'difference',
-    'divide', 'drop', 'dropRight', 'dropRightWhile', 'dropWhile', 'endsWith', 'eq',
-    'every', 'filter', 'find', 'findIndex', 'findKey', 'findLast', 'findLastIndex',
-    'findLastKey', 'flatMap', 'flatMapDeep', 'flattenDepth', 'forEach',
-    'forEachRight', 'forIn', 'forInRight', 'forOwn', 'forOwnRight', 'get',
-    'groupBy', 'gt', 'gte', 'has', 'hasIn', 'includes', 'indexOf', 'intersection',
-    'invertBy', 'invoke', 'invokeMap', 'isEqual', 'isMatch', 'join', 'keyBy',
-    'lastIndexOf', 'lt', 'lte', 'map', 'mapKeys', 'mapValues', 'matchesProperty',
-    'maxBy', 'meanBy', 'merge', 'mergeAllWith', 'minBy', 'multiply', 'nth', 'omit',
-    'omitBy', 'overArgs', 'pad', 'padEnd', 'padStart', 'parseInt', 'partial',
-    'partialRight', 'partition', 'pick', 'pickBy', 'propertyOf', 'pull', 'pullAll',
-    'pullAt', 'random', 'range', 'rangeRight', 'rearg', 'reject', 'remove',
-    'repeat', 'restFrom', 'result', 'sampleSize', 'some', 'sortBy', 'sortedIndex',
-    'sortedIndexOf', 'sortedLastIndex', 'sortedLastIndexOf', 'sortedUniqBy',
-    'split', 'spreadFrom', 'startsWith', 'subtract', 'sumBy', 'take', 'takeRight',
-    'takeRightWhile', 'takeWhile', 'tap', 'throttle', 'thru', 'times', 'trimChars',
-    'trimCharsEnd', 'trimCharsStart', 'truncate', 'union', 'uniqBy', 'uniqWith',
-    'unset', 'unzipWith', 'without', 'wrap', 'xor', 'zip', 'zipObject',
-    'zipObjectDeep'
-  ],
-  '3': [
-    'assignInWith', 'assignWith', 'clamp', 'differenceBy', 'differenceWith',
-    'findFrom', 'findIndexFrom', 'findLastFrom', 'findLastIndexFrom', 'getOr',
-    'includesFrom', 'indexOfFrom', 'inRange', 'intersectionBy', 'intersectionWith',
-    'invokeArgs', 'invokeArgsMap', 'isEqualWith', 'isMatchWith', 'flatMapDepth',
-    'lastIndexOfFrom', 'mergeWith', 'orderBy', 'padChars', 'padCharsEnd',
-    'padCharsStart', 'pullAllBy', 'pullAllWith', 'rangeStep', 'rangeStepRight',
-    'reduce', 'reduceRight', 'replace', 'set', 'slice', 'sortedIndexBy',
-    'sortedLastIndexBy', 'transform', 'unionBy', 'unionWith', 'update', 'xorBy',
-    'xorWith', 'zipWith'
-  ],
-  '4': [
-    'fill', 'setWith', 'updateWith'
-  ]
-};
-
-/** Used to map ary to rearg configs. */
-exports.aryRearg = {
-  '2': [1, 0],
-  '3': [2, 0, 1],
-  '4': [3, 2, 0, 1]
-};
-
-/** Used to map method names to their iteratee ary. */
-exports.iterateeAry = {
-  'dropRightWhile': 1,
-  'dropWhile': 1,
-  'every': 1,
-  'filter': 1,
-  'find': 1,
-  'findFrom': 1,
-  'findIndex': 1,
-  'findIndexFrom': 1,
-  'findKey': 1,
-  'findLast': 1,
-  'findLastFrom': 1,
-  'findLastIndex': 1,
-  'findLastIndexFrom': 1,
-  'findLastKey': 1,
-  'flatMap': 1,
-  'flatMapDeep': 1,
-  'flatMapDepth': 1,
-  'forEach': 1,
-  'forEachRight': 1,
-  'forIn': 1,
-  'forInRight': 1,
-  'forOwn': 1,
-  'forOwnRight': 1,
-  'map': 1,
-  'mapKeys': 1,
-  'mapValues': 1,
-  'partition': 1,
-  'reduce': 2,
-  'reduceRight': 2,
-  'reject': 1,
-  'remove': 1,
-  'some': 1,
-  'takeRightWhile': 1,
-  'takeWhile': 1,
-  'times': 1,
-  'transform': 2
-};
-
-/** Used to map method names to iteratee rearg configs. */
-exports.iterateeRearg = {
-  'mapKeys': [1],
-  'reduceRight': [1, 0]
-};
-
-/** Used to map method names to rearg configs. */
-exports.methodRearg = {
-  'assignInAllWith': [1, 0],
-  'assignInWith': [1, 2, 0],
-  'assignAllWith': [1, 0],
-  'assignWith': [1, 2, 0],
-  'differenceBy': [1, 2, 0],
-  'differenceWith': [1, 2, 0],
-  'getOr': [2, 1, 0],
-  'intersectionBy': [1, 2, 0],
-  'intersectionWith': [1, 2, 0],
-  'isEqualWith': [1, 2, 0],
-  'isMatchWith': [2, 1, 0],
-  'mergeAllWith': [1, 0],
-  'mergeWith': [1, 2, 0],
-  'padChars': [2, 1, 0],
-  'padCharsEnd': [2, 1, 0],
-  'padCharsStart': [2, 1, 0],
-  'pullAllBy': [2, 1, 0],
-  'pullAllWith': [2, 1, 0],
-  'rangeStep': [1, 2, 0],
-  'rangeStepRight': [1, 2, 0],
-  'setWith': [3, 1, 2, 0],
-  'sortedIndexBy': [2, 1, 0],
-  'sortedLastIndexBy': [2, 1, 0],
-  'unionBy': [1, 2, 0],
-  'unionWith': [1, 2, 0],
-  'updateWith': [3, 1, 2, 0],
-  'xorBy': [1, 2, 0],
-  'xorWith': [1, 2, 0],
-  'zipWith': [1, 2, 0]
-};
-
-/** Used to map method names to spread configs. */
-exports.methodSpread = {
-  'assignAll': { 'start': 0 },
-  'assignAllWith': { 'start': 0 },
-  'assignInAll': { 'start': 0 },
-  'assignInAllWith': { 'start': 0 },
-  'defaultsAll': { 'start': 0 },
-  'defaultsDeepAll': { 'start': 0 },
-  'invokeArgs': { 'start': 2 },
-  'invokeArgsMap': { 'start': 2 },
-  'mergeAll': { 'start': 0 },
-  'mergeAllWith': { 'start': 0 },
-  'partial': { 'start': 1 },
-  'partialRight': { 'start': 1 },
-  'without': { 'start': 1 },
-  'zipAll': { 'start': 0 }
-};
-
-/** Used to identify methods which mutate arrays or objects. */
-exports.mutate = {
-  'array': {
-    'fill': true,
-    'pull': true,
-    'pullAll': true,
-    'pullAllBy': true,
-    'pullAllWith': true,
-    'pullAt': true,
-    'remove': true,
-    'reverse': true
-  },
-  'object': {
-    'assign': true,
-    'assignAll': true,
-    'assignAllWith': true,
-    'assignIn': true,
-    'assignInAll': true,
-    'assignInAllWith': true,
-    'assignInWith': true,
-    'assignWith': true,
-    'defaults': true,
-    'defaultsAll': true,
-    'defaultsDeep': true,
-    'defaultsDeepAll': true,
-    'merge': true,
-    'mergeAll': true,
-    'mergeAllWith': true,
-    'mergeWith': true,
-  },
-  'set': {
-    'set': true,
-    'setWith': true,
-    'unset': true,
-    'update': true,
-    'updateWith': true
-  }
-};
-
-/** Used to map real names to their aliases. */
-exports.realToAlias = (function() {
-  var hasOwnProperty = Object.prototype.hasOwnProperty,
-      object = exports.aliasToReal,
-      result = {};
-
-  for (var key in object) {
-    var value = object[key];
-    if (hasOwnProperty.call(result, value)) {
-      result[value].push(key);
-    } else {
-      result[value] = [key];
-    }
-  }
-  return result;
-}());
-
-/** Used to map method names to other names. */
-exports.remap = {
-  'assignAll': 'assign',
-  'assignAllWith': 'assignWith',
-  'assignInAll': 'assignIn',
-  'assignInAllWith': 'assignInWith',
-  'curryN': 'curry',
-  'curryRightN': 'curryRight',
-  'defaultsAll': 'defaults',
-  'defaultsDeepAll': 'defaultsDeep',
-  'findFrom': 'find',
-  'findIndexFrom': 'findIndex',
-  'findLastFrom': 'findLast',
-  'findLastIndexFrom': 'findLastIndex',
-  'getOr': 'get',
-  'includesFrom': 'includes',
-  'indexOfFrom': 'indexOf',
-  'invokeArgs': 'invoke',
-  'invokeArgsMap': 'invokeMap',
-  'lastIndexOfFrom': 'lastIndexOf',
-  'mergeAll': 'merge',
-  'mergeAllWith': 'mergeWith',
-  'padChars': 'pad',
-  'padCharsEnd': 'padEnd',
-  'padCharsStart': 'padStart',
-  'propertyOf': 'get',
-  'rangeStep': 'range',
-  'rangeStepRight': 'rangeRight',
-  'restFrom': 'rest',
-  'spreadFrom': 'spread',
-  'trimChars': 'trim',
-  'trimCharsEnd': 'trimEnd',
-  'trimCharsStart': 'trimStart',
-  'zipAll': 'zip'
-};
-
-/** Used to track methods that skip fixing their arity. */
-exports.skipFixed = {
-  'castArray': true,
-  'flow': true,
-  'flowRight': true,
-  'iteratee': true,
-  'mixin': true,
-  'rearg': true,
-  'runInContext': true
-};
-
-/** Used to track methods that skip rearranging arguments. */
-exports.skipRearg = {
-  'add': true,
-  'assign': true,
-  'assignIn': true,
-  'bind': true,
-  'bindKey': true,
-  'concat': true,
-  'difference': true,
-  'divide': true,
-  'eq': true,
-  'gt': true,
-  'gte': true,
-  'isEqual': true,
-  'lt': true,
-  'lte': true,
-  'matchesProperty': true,
-  'merge': true,
-  'multiply': true,
-  'overArgs': true,
-  'partial': true,
-  'partialRight': true,
-  'propertyOf': true,
-  'random': true,
-  'range': true,
-  'rangeRight': true,
-  'subtract': true,
-  'zip': true,
-  'zipObject': true,
-  'zipObjectDeep': true
-};
--- a/fp/placeholder.js
+++ b/fp/placeholder.js
@@ -1,6 +0,0 @@
-/**
- * The default argument placeholder value for methods.
- *
- * @type {Object}
- */
-module.exports = {};
--- a/lib/common/file.js
+++ b/lib/common/file.js
@@ -1,71 +0,0 @@
-'use strict';
-
-const _ = require('lodash');
-const fs = require('fs-extra');
-const glob = require('glob');
-const path = require('path');
-
-const minify = require('../common/minify.js');
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Creates a [fs.copy](https://github.com/jprichardson/node-fs-extra#copy)
- * function with `srcPath` and `destPath` partially applied.
- *
- * @memberOf file
- * @param {string} srcPath The path of the file to copy.
- * @param {string} destPath The path to copy the file to.
- * @returns {Function} Returns the partially applied function.
- */
-function copy(srcPath, destPath) {
-  return _.partial(fs.copy, srcPath, destPath);
-}
-
-/**
- * Creates an object of base name and compiled template pairs that match `pattern`.
- *
- * @memberOf file
- * @param {string} pattern The glob pattern to be match.
- * @returns {Object} Returns the object of compiled templates.
- */
-function globTemplate(pattern) {
-  return _.transform(glob.sync(pattern), (result, filePath) => {
-    const key = path.basename(filePath, path.extname(filePath));
-    result[key] = _.template(fs.readFileSync(filePath, 'utf8'));
-  }, {});
-}
-
-/**
- * Creates a `minify` function with `srcPath` and `destPath` partially applied.
- *
- * @memberOf file
- * @param {string} srcPath The path of the file to minify.
- * @param {string} destPath The path to write the file to.
- * @returns {Function} Returns the partially applied function.
- */
-function min(srcPath, destPath) {
-  return _.partial(minify, srcPath, destPath);
-}
-
-/**
- * Creates a [fs.writeFile](https://nodejs.org/api/fs.html#fs_fs_writefile_file_data_options_callback)
- * function with `filePath` and `data` partially applied.
- *
- * @memberOf file
- * @param {string} destPath The path to write the file to.
- * @param {string} data The data to write to the file.
- * @returns {Function} Returns the partially applied function.
- */
-function write(destPath, data) {
-  return _.partial(fs.writeFile, destPath, data);
-}
-
-/*----------------------------------------------------------------------------*/
-
-module.exports = {
-  copy,
-  globTemplate,
-  min,
-  write
-};
--- a/lib/common/mapping.js
+++ b/lib/common/mapping.js
@@ -1,9 +0,0 @@
-'use strict';
-
-const _mapping = require('../../fp/_mapping');
-const util = require('./util');
-const Hash = util.Hash;
-
-/*----------------------------------------------------------------------------*/
-
-module.exports = new Hash(_mapping);
--- a/lib/common/minify.js
+++ b/lib/common/minify.js
@@ -1,39 +0,0 @@
-'use strict';
-
-const _ = require('lodash');
-const fs = require('fs-extra');
-const uglify = require('uglify-js');
-
-const uglifyOptions = require('./uglify.options');
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Asynchronously minifies the file at `srcPath`, writes it to `destPath`, and
- * invokes `callback` upon completion. The callback is invoked with one argument:
- * (error).
- *
- * If unspecified, `destPath` is `srcPath` with an extension of `.min.js`.
- * (e.g. the `destPath` of `path/to/foo.js` would be `path/to/foo.min.js`)
- *
- * @param {string} srcPath The path of the file to minify.
- * @param {string} [destPath] The path to write the file to.
- * @param {Function} callback The function invoked upon completion.
- * @param {Object} [option] The UglifyJS options object.
- */
-function minify(srcPath, destPath, callback, options) {
-  if (_.isFunction(destPath)) {
-    if (_.isObject(callback)) {
-      options = callback;
-    }
-    callback = destPath;
-    destPath = undefined;
-  }
-  if (!destPath) {
-    destPath = srcPath.replace(/(?=\.js$)/, '.min');
-  }
-  const output = uglify.minify(srcPath, _.defaults(options || {}, uglifyOptions));
-  fs.writeFile(destPath, output.code, 'utf-8', callback);
-}
-
-module.exports = minify;
--- a/lib/common/uglify.options.js
+++ b/lib/common/uglify.options.js
@@ -1,22 +0,0 @@
-'use strict';
-
-/**
- * The UglifyJS options object for
- * [compress](https://github.com/mishoo/UglifyJS2#compressor-options),
- * [mangle](https://github.com/mishoo/UglifyJS2#mangler-options), and
- * [output](https://github.com/mishoo/UglifyJS2#beautifier-options) options.
- */
-module.exports = {
-  'compress': {
-    'collapse_vars': true,
-    'negate_iife': false,
-    'pure_getters': true,
-    'unsafe': true,
-    'warnings': false
-  },
-  'output': {
-    'ascii_only': true,
-    'comments': /@license/,
-    'max_line_len': 500
-  }
-};
--- a/lib/common/util.js
+++ b/lib/common/util.js
@@ -1,40 +0,0 @@
-'use strict';
-
-const _ = require('lodash');
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Creates a hash object. If a `properties` object is provided, its own
- * enumerable properties are assigned to the created hash.
- *
- * @memberOf util
- * @param {Object} [properties] The properties to assign to the hash.
- * @returns {Object} Returns the new hash object.
- */
-function Hash(properties) {
-  return _.transform(properties, (result, value, key) => {
-    result[key] = (_.isPlainObject(value) && !(value instanceof Hash))
-      ? new Hash(value)
-      : value;
-  }, this);
-}
-
-Hash.prototype = Object.create(null);
-
-/**
- * This method throws any error it receives.
- *
- * @memberOf util
- * @param {Object} [error] The error object.
- */
-function pitch(error) {
-  if (error != null) {
-    throw error;
-  }
-}
-
-module.exports = {
-  Hash,
-  pitch
-};
--- a/lib/fp/build-dist.js
+++ b/lib/fp/build-dist.js
@@ -1,56 +0,0 @@
-'use strict';
-
-const _ = require('lodash');
-const async = require('async');
-const path = require('path');
-const webpack = require('webpack');
-
-const file = require('../common/file');
-const util = require('../common/util');
-
-const basePath = path.join(__dirname, '..', '..');
-const distPath = path.join(basePath, 'dist');
-const fpPath = path.join(basePath, 'fp');
-const filename = 'lodash.fp.js';
-
-const fpConfig = {
-  'entry': path.join(fpPath, '_convertBrowser.js'),
-  'output': {
-    'path': distPath,
-    'filename': filename,
-    'library': 'fp',
-    'libraryTarget': 'umd'
-  },
-  'plugins': [
-    new webpack.optimize.OccurenceOrderPlugin,
-    new webpack.optimize.DedupePlugin
-  ]
-};
-
-const mappingConfig = {
-  'entry': path.join(fpPath, '_mapping.js'),
-  'output': {
-    'path': distPath,
-    'filename': 'mapping.fp.js',
-    'library': 'mapping',
-    'libraryTarget': 'umd'
-  }
-};
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Creates browser builds of the FP converter and mappings at the `target` path.
- *
- * @private
- * @param {string} target The output directory path.
- */
-function build() {
-  async.series([
-    _.partial(webpack, mappingConfig),
-    _.partial(webpack, fpConfig),
-    file.min(path.join(distPath, filename))
-  ], util.pitch);
-}
-
-build();
--- a/lib/fp/build-doc.js
+++ b/lib/fp/build-doc.js
@@ -1,78 +0,0 @@
-'use strict';
-
-const _ = require('lodash');
-const fs = require('fs-extra');
-const path = require('path');
-
-const file = require('../common/file');
-const mapping = require('../common/mapping');
-const util = require('../common/util');
-
-const templatePath = path.join(__dirname, 'template/doc');
-const template = file.globTemplate(path.join(templatePath, '*.jst'));
-
-const argNames = ['a', 'b', 'c', 'd'];
-
-const templateData = {
-  mapping,
-  toArgOrder,
-  toFuncList
-};
-
-/**
- * Converts arranged argument `indexes` into a named argument string
- * representation of their order.
- *
- * @private
- * @param {number[]} indexes The arranged argument indexes.
- * @returns {string} Returns the named argument string.
- */
-function toArgOrder(indexes) {
-  const reordered = [];
-  _.each(indexes, (newIndex, index) => {
-    reordered[newIndex] = argNames[index];
-  });
-  return '`(' + reordered.join(', ') + ')`';
-}
-
-/**
- * Converts `funcNames` into a chunked list string representation.
- *
- * @private
- * @param {string[]} funcNames The function names.
- * @returns {string} Returns the function list string.
- */
-function toFuncList(funcNames) {
-  let chunks = _.chunk(funcNames.slice().sort(), 5);
-  let lastChunk = _.last(chunks);
-  const lastName = lastChunk ? lastChunk.pop() : undefined;
-
-  chunks = _.reject(chunks, _.isEmpty);
-  lastChunk = _.last(chunks);
-
-  let result = '`' + _.map(chunks, chunk => chunk.join('`, `') + '`').join(',\n`');
-  if (lastName == null) {
-    return result;
-  }
-  if (_.size(chunks) > 1 || _.size(lastChunk) > 1) {
-    result += ',';
-  }
-  result += ' &';
-  result += _.size(lastChunk) < 5 ? ' ' : '\n';
-  return result + '`' + lastName + '`';
-}
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Creates the FP-Guide wiki at the `target` path.
- *
- * @private
- * @param {string} target The output file path.
- */
-function build(target) {
-  target = path.resolve(target);
-  fs.writeFile(target, template.wiki(templateData), util.pitch);
-}
-
-build(_.last(process.argv));
--- a/lib/fp/build-modules.js
+++ b/lib/fp/build-modules.js
@@ -1,150 +0,0 @@
-'use strict';
-
-const _ = require('lodash');
-const async = require('async');
-const glob = require('glob');
-const path = require('path');
-
-const file = require('../common/file');
-const mapping = require('../common/mapping');
-const util = require('../common/util');
-
-const templatePath = path.join(__dirname, 'template/modules');
-const template = file.globTemplate(path.join(templatePath, '*.jst'));
-
-const aryMethods = _.union(
-  mapping.aryMethod[1],
-  mapping.aryMethod[2],
-  mapping.aryMethod[3],
-  mapping.aryMethod[4]
-);
-
-const categories = [
-  'array',
-  'collection',
-  'date',
-  'function',
-  'lang',
-  'math',
-  'number',
-  'object',
-  'seq',
-  'string',
-  'util'
-];
-
-const ignored = [
-  '_*.js',
-  'core.js',
-  'core.min.js',
-  'fp.js',
-  'index.js',
-  'lodash.js',
-  'lodash.min.js'
-];
-
-/**
- * Checks if `name` is a method alias.
- *
- * @private
- * @param {string} name The name to check.
- * @returns {boolean} Returns `true` if `name` is a method alias, else `false`.
- */
-function isAlias(name) {
-  return _.has(mapping.aliasToReal, name);
-}
-
-/**
- * Checks if `name` is a category name.
- *
- * @private
- * @param {string} name The name to check.
- * @returns {boolean} Returns `true` if `name` is a category name, else `false`.
- */
-function isCategory(name) {
-  return _.includes(categories, name);
-}
-
-/**
- * Checks if `name` belongs to a method that's passed thru and not wrapped.
- *
- * @private
- * @param {string} name The name to check.
- * @returns {boolean} Returns `true` if `name` is of a pass thru method,
- *  else `false`.
- */
-function isThru(name) {
-  return !_.includes(aryMethods, name);
-}
-
-/**
- * Gets metadata for `func`.
- *
- * @private
- * @param {Function} func The function to query.
- * @returns {*} Returns the metadata for `func`.
- */
-function getTemplate(moduleName) {
-  const data = {
-    'name': _.get(mapping.aliasToReal, moduleName, moduleName),
-    'mapping': mapping
-  };
-
-  if (isAlias(moduleName)) {
-    return template.alias(data);
-  }
-  if (isCategory(moduleName)) {
-    return template.category(data);
-  }
-  if (isThru(moduleName)) {
-    return template.thru(data);
-  }
-  return template.module(data);
-}
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Creates FP modules at the `target` path.
- *
- * @private
- * @param {string} target The output directory path.
- */
-function build(target) {
-  target = path.resolve(target);
-
-  const fpPath = path.join(target, 'fp');
-
-  // Glob existing lodash module paths.
-  const modulePaths = glob.sync(path.join(target, '*.js'), {
-    'nodir': true,
-    'ignore': ignored.map(filename => {
-      return path.join(target, filename);
-    })
-  });
-
-  // Add FP alias and remapped module paths.
-  _.each([mapping.aliasToReal, mapping.remap], data => {
-    _.forOwn(data, (realName, alias) => {
-      const modulePath = path.join(target, alias + '.js');
-      if (!_.includes(modulePaths, modulePath)) {
-        modulePaths.push(modulePath);
-      }
-    });
-  });
-
-  const actions = modulePaths.map(modulePath => {
-    const moduleName = path.basename(modulePath, '.js');
-    return file.write(path.join(fpPath, moduleName + '.js'), getTemplate(moduleName));
-  });
-
-  actions.unshift(file.copy(path.join(__dirname, '../../fp'), fpPath));
-  actions.push(file.write(path.join(fpPath, '_falseOptions.js'), template._falseOptions()));
-  actions.push(file.write(path.join(fpPath, '_util.js'), template._util()));
-  actions.push(file.write(path.join(target, 'fp.js'), template.fp()));
-  actions.push(file.write(path.join(fpPath, 'convert.js'), template.convert()));
-
-  async.series(actions, util.pitch);
-}
-
-build(_.last(process.argv));
--- a/lib/fp/template/doc/wiki.jst
+++ b/lib/fp/template/doc/wiki.jst
@@ -1,228 +0,0 @@
-## lodash/fp
-
-The `lodash/fp` module promotes a more
-[functional programming](https://en.wikipedia.org/wiki/Functional_programming)
-(FP) friendly style by exporting an instance of `lodash` with its methods wrapped
-to produce immutable auto-curried iteratee-first data-last methods.
-
-## Installation
-
-In a browser:
-```html
-<script src='https://cdn.jsdelivr.net/g/lodash@4(lodash.min.js+lodash.fp.min.js)'></script>
-<script>
-// Loading `lodash.fp.js` converts `_` to its fp variant.
-_.defaults({ 'a': 2, 'b': 2 })({ 'a': 1 });
-// ➜ { 'a': 1, 'b': 2 }
-
-// Use `noConflict` to restore the pre-fp variant.
-var fp = _.noConflict();
-
-_.defaults({ 'a': 1 }, { 'a': 2, 'b': 2 });
-// ➜ { 'a': 1, 'b': 2 }
-fp.defaults({ 'a': 2, 'b': 2 })({ 'a': 1 });
-// ➜ { 'a': 1, 'b': 2 }
-</script>
-```
-
-In Node.js:
-```js
-// Load the fp build.
-var fp = require('lodash/fp');
-
-// Load a method category.
-var object = require('lodash/fp/object');
-
-// Load a single method for smaller builds with browserify/rollup/webpack.
-var extend = require('lodash/fp/extend');
-```
-
-## Mapping
-
-Immutable auto-curried iteratee-first data-last methods sound great, but what
-does that really mean for each method? Below is a breakdown of the mapping used
-to convert each method.
-
-#### Capped Iteratee Arguments
-
-Iteratee arguments are capped to avoid gotchas with variadic iteratees.
-```js
-// The `lodash/map` iteratee receives three arguments:
-// (value, index|key, collection)
-_.map(['6', '8', '10'], parseInt);
-// ➜ [6, NaN, 2]
-
-// The `lodash/fp/map` iteratee is capped at one argument:
-// (value)
-fp.map(parseInt)(['6', '8', '10']);
-// ➜ [6, 8, 10]
-```
-
-Methods that cap iteratees to one argument:<br>
-<%= toFuncList(_.keys(_.pickBy(mapping.iterateeAry, _.partial(_.eq, _, 1)))) %>
-
-Methods that cap iteratees to two arguments:<br>
-<%= toFuncList(_.keys(_.pickBy(mapping.iterateeAry, _.partial(_.eq, _, 2)))) %>
-
-The iteratee of `mapKeys` is capped to one argument: `(key)`
-
-#### Fixed Arity
-
-Methods have fixed arities to support auto-currying.
-```js
-// `lodash/padStart` accepts an optional `chars` param.
-_.padStart('a', 3, '-')
-// ➜ '--a'
-
-// `lodash/fp/padStart` does not.
-fp.padStart(3)('a');
-// ➜ '  a'
-fp.padCharsStart('-')(3)('a');
-// ➜ '--a'
-```
-
-Methods with a fixed arity of one:<br>
-<%= toFuncList(_.difference(mapping.aryMethod[1], _.keys(mapping.skipFixed))) %>
-
-Methods with a fixed arity of two:<br>
-<%= toFuncList(_.difference(mapping.aryMethod[2], _.keys(mapping.skipFixed))) %>
-
-Methods with a fixed arity of three:<br>
-<%= toFuncList(_.difference(mapping.aryMethod[3], _.keys(mapping.skipFixed))) %>
-
-Methods with a fixed arity of four:<br>
-<%= toFuncList(_.difference(mapping.aryMethod[4], _.keys(mapping.skipFixed))) %>
-
-#### Rearranged Arguments
-
-Method arguments are rearranged to make composition easier.
-```js
-// `lodash/filter` is data-first iteratee-last:
-// (collection, iteratee)
-var compact = _.partial(_.filter, _, Boolean);
-compact(['a', null, 'c']);
-// ➜ ['a', 'c']
-
-// `lodash/fp/filter` is iteratee-first data-last:
-// (iteratee, collection)
-var compact = fp.filter(Boolean);
-compact(['a', null, 'c']);
-// ➜ ['a', 'c']
-```
-
-##### Most methods follow these rules
-
-A fixed arity of two has an argument order of:<br>
-<%= toArgOrder(mapping.aryRearg[2]) %>
-
-A fixed arity of three has an argument order of:<br>
-<%= toArgOrder(mapping.aryRearg[3]) %>
-
-A fixed arity of four has an argument order of:<br>
-<%= toArgOrder(mapping.aryRearg[4]) %>
-
-##### Exceptions to the rules
-
-Methods that accept an array as their last, second to last, or only argument:<br>
-<%= toFuncList(_.keys(mapping.methodSpread)) %>
-
-Methods with unchanged argument orders:<br>
-<%= toFuncList(_.keys(mapping.skipRearg)) %>
-
-Methods with custom argument orders:<br>
-<%= _.map(_.keys(mapping.methodRearg), methodName => {
-  const orders = mapping.methodRearg[methodName];
-  return ' * `_.' + methodName + '` has an order of ' + toArgOrder(orders);
-}).join('\n') %>
-
-The iteratee of `reduceRight` has an argument order of: `(b, a)`
-
-#### New Methods
-
-Not all variadic methods have corresponding new method variants. Feel free to
-[request](https://github.com/lodash/lodash/blob/master/.github/CONTRIBUTING.md#feature-requests)
-any additions.
-
-Methods created to accommodate Lodash’s variadic methods:<br>
-<%= toFuncList(_.keys(mapping.remap)) %>
-
-#### Aliases
-
-There are <%= _.size(mapping.aliasToReal) %> method aliases:<br>
-<%= _.map(_.keys(mapping.aliasToReal).sort(), alias => {
-  const realName = mapping.aliasToReal[alias];
-  return ' * `_.' + alias + '` is an alias of `_.' + realName + '`';
-}).join('\n') %>
-
-## Placeholders
-
-The placeholder argument, which defaults to `_`, may be used to fill in method
-arguments in a different order. Placeholders are filled by the first available
-arguments of the curried returned function.
-```js
-// The equivalent of `2 > 5`.
-_.gt(2)(5);
-// ➜ false
-
-// The equivalent of `_.gt(5, 2)` or `5 > 2`.
-_.gt(_, 2)(5);
-// ➜ true
-```
-
-## Chaining
-
-The `lodash/fp` module **does not** convert chain sequence methods. See
-[Izaak Schroeder’s article](https://medium.com/making-internets/why-using-chain-is-a-mistake-9bc1f80d51ba)
-on using functional composition as an alternative to method chaining.
-
-## Convert
-
-Although `lodash/fp` & its method modules come pre-converted, there are times
-when you may want to customize the conversion. That’s when the `convert` method
-comes in handy.
-```js
-// Every option is `true` by default.
-var _fp = fp.convert({
-  // Specify capping iteratee arguments.
-  'cap': true,
-  // Specify currying.
-  'curry': true,
-  // Specify fixed arity.
-  'fixed': true,
-  // Specify immutable operations.
-  'immutable': true,
-  // Specify rearranging arguments.
-  'rearg': true
-});
-
-// The `convert` method is available on each method too.
-var mapValuesWithKey = fp.mapValues.convert({ 'cap': false });
-
-// Here’s an example of disabling iteratee argument caps to access the `key` param.
-mapValuesWithKey(function(value, key) {
-  return key == 'a' ? -1 : value;
-})({ 'a': 1, 'b': 1 });
-// => { 'a': -1, 'b': 1 }
-```
-
-Manual conversions are also possible with the `convert` module.
-```js
-var convert = require('lodash/fp/convert');
-
-// Convert by name.
-var assign = convert('assign', require('lodash.assign'));
-
-// Convert by object.
-var fp = convert({
-  'assign': require('lodash.assign'),
-  'chunk': require('lodash.chunk')
-});
-
-// Convert by `lodash` instance.
-var fp = convert(lodash.runInContext());
-```
-
-## Tooling
-
-Use [eslint-plugin-lodash-fp](https://www.npmjs.com/package/eslint-plugin-lodash-fp)
-to help use `lodash/fp` more efficiently.
--- a/lib/fp/template/modules/_falseOptions.jst
+++ b/lib/fp/template/modules/_falseOptions.jst
@@ -1,7 +0,0 @@
-module.exports = {
-  'cap': false,
-  'curry': false,
-  'fixed': false,
-  'immutable': false,
-  'rearg': false
-};
--- a/lib/fp/template/modules/_util.jst
+++ b/lib/fp/template/modules/_util.jst
@@ -1,16 +0,0 @@
-module.exports = {
-  'ary': require('../ary'),
-  'assign': require('../_baseAssign'),
-  'clone': require('../clone'),
-  'curry': require('../curry'),
-  'forEach': require('../_arrayEach'),
-  'isArray': require('../isArray'),
-  'isError': require('../isError'),
-  'isFunction': require('../isFunction'),
-  'isWeakMap': require('../isWeakMap'),
-  'iteratee': require('../iteratee'),
-  'keys': require('../_baseKeys'),
-  'rearg': require('../rearg'),
-  'toInteger': require('../toInteger'),
-  'toPath': require('../toPath')
-};
--- a/lib/fp/template/modules/alias.jst
+++ b/lib/fp/template/modules/alias.jst
@@ -1 +0,0 @@
-module.exports = require('./<%= name %>');
--- a/lib/fp/template/modules/category.jst
+++ b/lib/fp/template/modules/category.jst
@@ -1,2 +0,0 @@
-var convert = require('./convert');
-module.exports = convert(require('../<%= name %>'));
--- a/lib/fp/template/modules/convert.jst
+++ b/lib/fp/template/modules/convert.jst
@@ -1,18 +0,0 @@
-var baseConvert = require('./_baseConvert'),
-    util = require('./_util');
-
-/**
- * Converts `func` of `name` to an immutable auto-curried iteratee-first data-last
- * version with conversion `options` applied. If `name` is an object its methods
- * will be converted.
- *
- * @param {string} name The name of the function to wrap.
- * @param {Function} [func] The function to wrap.
- * @param {Object} [options] The options object. See `baseConvert` for more details.
- * @returns {Function|Object} Returns the converted function or object.
- */
-function convert(name, func, options) {
-  return baseConvert(util, name, func, options);
-}
-
-module.exports = convert;
--- a/lib/fp/template/modules/fp.jst
+++ b/lib/fp/template/modules/fp.jst
@@ -1,2 +0,0 @@
-var _ = require('./lodash.min').runInContext();
-module.exports = require('./fp/_baseConvert')(_, _);
--- a/lib/fp/template/modules/module.jst
+++ b/lib/fp/template/modules/module.jst
@@ -1,5 +0,0 @@
-var convert = require('./convert'),
-    func = convert('<%= name %>', require('../<%= _.get(mapping.remap, name, name) %>'));
-
-func.placeholder = require('./placeholder');
-module.exports = func;
--- a/lib/fp/template/modules/thru.jst
+++ b/lib/fp/template/modules/thru.jst
@@ -1,5 +0,0 @@
-var convert = require('./convert'),
-    func = convert('<%= name %>', require('../<%= _.get(mapping.remap, name, name) %>'), require('./_falseOptions'));
-
-func.placeholder = require('./placeholder');
-module.exports = func;
--- a/lib/main/build-dist.js
+++ b/lib/main/build-dist.js
@@ -1,31 +0,0 @@
-'use strict';
-
-const async = require('async');
-const path = require('path');
-
-const file = require('../common/file');
-const util = require('../common/util');
-
-const basePath = path.join(__dirname, '..', '..');
-const distPath = path.join(basePath, 'dist');
-const filename = 'lodash.js';
-
-const baseLodash = path.join(basePath, filename);
-const distLodash = path.join(distPath, filename);
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Creates browser builds of Lodash at the `target` path.
- *
- * @private
- * @param {string} target The output directory path.
- */
-function build() {
-  async.series([
-    file.copy(baseLodash, distLodash),
-    file.min(distLodash)
-  ], util.pitch);
-}
-
-build();
--- a/lib/main/build-doc.js
+++ b/lib/main/build-doc.js
@@ -1,83 +0,0 @@
-'use strict';
-
-const _ = require('lodash');
-const docdown = require('docdown');
-const fs = require('fs-extra');
-const path = require('path');
-
-const util = require('../common/util');
-
-const basePath = path.join(__dirname, '..', '..');
-const docPath = path.join(basePath, 'doc');
-const readmePath = path.join(docPath, 'README.md');
-
-const pkg = require('../../package.json');
-const version = pkg.version;
-
-const config = {
-  'base': {
-    'path': path.join(basePath, 'lodash.js'),
-    'title': `<a href="https://lodash.com/">lodash</a> <span>v${ version }</span>`,
-    'toc': 'categories',
-    'url': `https://github.com/lodash/lodash/blob/${ version }/lodash.js`
-  },
-  'github': {
-    'style': 'github',
-    'sublinks': [npmLink('&#x24C3;', 'See the npm package')]
-  },
-  'site': {
-    'entryLink': '<a href="${entryHref}" class="fa fa-link"></a>',
-    'sourceLink': '[source](${sourceHref})',
-    'tocHref': '',
-    'tocLink': '',
-    'sublinks': [npmLink('npm package')]
-  }
-};
-
-/**
- * Composes a npm link from `text` and optional `title`.
- *
- * @private
- * @param {string} text The link text.
- * @param {string} [title] The link title.
- * @returns {string} Returns the composed npm link.
- */
-function npmLink(text, title) {
-  return (
-    '<% if (name == "templateSettings" || !/^(?:methods|properties|seq)$/i.test(category)) {' +
-      'print(' +
-        '"[' + text + '](https://www.npmjs.com/package/lodash." + name.toLowerCase() + ' +
-        '"' + (title == null ? '' : ' \\"' + title + '\\"') + ')"' +
-      ');' +
-    '} %>'
-  );
-}
-
-/**
- * Post-process `markdown` to make adjustments.
- *
- * @private
- * @param {string} markdown The markdown to process.
- * @returns {string} Returns the processed markdown.
- */
-function postprocess(markdown) {
-  // Wrap symbol property identifiers in brackets.
-  return markdown.replace(/\.(Symbol\.(?:[a-z]+[A-Z]?)+)/g, '[$1]');
-}
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Creates the documentation markdown formatted for 'github' or 'site'.
- *
- * @private
- * @param {string} type The format type.
- */
-function build(type) {
-  const options = _.defaults({}, config.base, config[type]);
-  const markdown = docdown(options);
-
-  fs.writeFile(readmePath, postprocess(markdown), util.pitch);
-}
-
-build(_.last(process.argv));
--- a/lib/main/build-modules.js
+++ b/lib/main/build-modules.js
@@ -1,34 +0,0 @@
-'use strict';
-
-const _ = require('lodash');
-const async = require('async');
-const path = require('path');
-
-const file = require('../common/file');
-const util = require('../common/util');
-
-const basePath = path.join(__dirname, '..', '..');
-const distPath = path.join(basePath, 'dist');
-
-const filePairs = [
-  [path.join(distPath, 'lodash.core.js'), 'core.js'],
-  [path.join(distPath, 'lodash.core.min.js'), 'core.min.js'],
-  [path.join(distPath, 'lodash.min.js'), 'lodash.min.js']
-];
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Creates supplementary Lodash modules at the `target` path.
- *
- * @private
- * @param {string} target The output directory path.
- */
-function build(target) {
-  const actions = _.map(filePairs, pair =>
-    file.copy(pair[0], path.join(target, pair[1])));
-
-  async.series(actions, util.pitch);
-}
-
-build(_.last(process.argv));
--- a/lib/main/build-site.js
+++ b/lib/main/build-site.js
@@ -1,224 +0,0 @@
-'use strict';
-
-const _ = require('lodash');
-const cheerio = require('cheerio');
-const fs = require('fs');
-const marky = require('marky-markdown');
-const path = require('path');
-const util = require('../common/util');
-
-const basePath = path.join(__dirname, '..', '..');
-const docPath = path.join(basePath, 'doc');
-const readmePath = path.join(docPath, 'README.md');
-
-const highlights = {
-  'html': [
-    'string'
-  ],
-  'js': [
-    'comment',
-    'console',
-    'delimiter',
-    'method',
-    'modifier',
-    'name',
-    'numeric',
-    'string',
-    'support',
-    'type'
-  ]
-};
-
-const exts = _.keys(highlights);
-
-/**
- * Converts Lodash method references into documentation links.
- *
- * @private
- * @param {Object} $ The Cheerio object.
- */
-function autoLink($) {
-  $('.doc-container code').each(function() {
-    const $code = $(this);
-    const html = $code.html();
-    if (/^_\.\w+$/.test(html)) {
-      const id = html.split('.')[1];
-      $code.replaceWith(`<a href="#${ id }"><code>_.${ id }</code></a>`);
-    }
-  });
-}
-
-/**
- * Removes horizontal rules from the document.
- *
- * @private
- * @param {Object} $ The Cheerio object.
- */
-function removeHorizontalRules($) {
-  $('hr').remove();
-}
-
-/**
- * Removes marky-markdown specific ids and class names.
- *
- * @private
- * @param {Object} $ The Cheerio object.
- */
-function removeMarkyAttributes($) {
-  $('[id^="user-content-"]')
-    .attr('class', null)
-    .attr('id', null);
-
-  $(':header:not(h3) > a').each(function() {
-    const $a = $(this);
-    $a.replaceWith($a.html());
-  });
-}
-
-/**
- * Renames "_" id and anchor references to "lodash".
- *
- * @private
- * @param {Object} $ The Cheerio object.
- */
-function renameLodashId($) {
-  $('#_').attr('id', 'lodash');
-  $('[href="#_"]').attr('href', '#lodash');
-}
-
-/**
- * Repairs broken marky-markdown headers.
- * See https://github.com/npm/marky-markdown/issues/217 for more details.
- *
- * @private
- * @param {Object} $ The Cheerio object.
- */
-function repairMarkyHeaders($) {
-  $('p:empty + h3').prev().remove();
-
-  $('h3 ~ p:empty').each(function() {
-    const $p = $(this);
-    let node = this.prev;
-    while ((node = node.prev) && node.name != 'h3' && node.name != 'p') {
-      $p.prepend(node.next);
-    }
-  });
-
-  $('h3 code em').parent().each(function() {
-    const $code = $(this);
-    $code.html($code.html().replace(/<\/?em>/g, '_'));
-  });
-}
-
-/**
- * Cleans up highlights blocks by removing extraneous class names and elements.
- *
- * @private
- * @param {Object} $ The Cheerio object.
- */
-function tidyHighlights($) {
-  $('.highlight').each(function() {
-    let $spans;
-    const $parent = $(this);
-    const classes = $parent.find('.source,.text').first().attr('class').split(' ');
-    const ext = _(classes).intersection(exts).last();
-
-    $parent.addClass(ext);
-
-    // Remove line indicators for single line snippets.
-    $parent.children('pre').each(function() {
-      const $divs = $(this).children('div');
-      if ($divs.length == 1) {
-        $divs.replaceWith($divs.html());
-      }
-    });
-    // Remove extraneous class names.
-    $parent.find('[class]').each(function() {
-      const $element = $(this);
-      const classes = $element.attr('class').split(' ');
-      const attr = _(classes).intersection(highlights[ext]).join(' ');
-      $element.attr('class', attr || null);
-    });
-    // Collapse nested comment highlights.
-    $parent.find(`[class~="comment"]`).each(function() {
-      const $element = $(this);
-      $element.text($element.text().trim());
-    });
-    // Collapse nested string highlights.
-    $parent.find(`[class~="string"]`).each(function() {
-      const $element = $(this);
-      $element.text($element.text());
-    });
-    // Collapse nested spans.
-    while (($spans = $parent.find('span:not([class])')).length) {
-      $spans.each(function() {
-        let $span = $(this);
-        while ($span[0] && $span[0].name == 'span' && !$span.attr('class')) {
-          const $parent = $span.parent();
-          $span.replaceWith($span.html());
-          $span = $parent;
-        }
-      });
-    }
-  });
-}
-
-/*----------------------------------------------------------------------------*/
-
-/**
- * Creates the documentation HTML.
- *
- * @private
- */
-function build() {
-  const markdown = fs
-    // Load markdown.
-    .readFileSync(readmePath, 'utf8')
-    // Uncomment docdown HTML hints.
-    .replace(/(<)!--\s*|\s*--(>)/g, '$1$2')
-    // Convert source and npm package links to anchors.
-    .replace(/\[source\]\(([^)]+)\) \[npm package\]\(([^)]+)\)/g, (match, href1, href2) =>
-      `<p><a href="${ href1 }">source</a> <a href="${ href2 }">npm package</a></p>`
-    );
-
-  const $ = cheerio.load(marky(markdown, {
-    'enableHeadingLinkIcons': false,
-    'sanitize': false
-  }));
-
-  const $header = $('h1').first().remove();
-  const version = $header.find('span').first().text().trim().slice(1);
-
-  // Auto-link Lodash method references.
-  autoLink($);
-  // Rename "_" id references to "lodash".
-  renameLodashId($);
-  // Remove docdown horizontal rules.
-  removeHorizontalRules($);
-  // Remove marky-markdown attribute additions.
-  removeMarkyAttributes($);
-  // Repair marky-markdown wrapping around headers.
-  repairMarkyHeaders($);
-  // Cleanup highlights.
-  tidyHighlights($);
-
-  const html = [
-    // Append YAML front matter.
-    '---',
-    'id: docs',
-    'layout: docs',
-    'title: Lodash Documentation',
-    'version: ' + (version || null),
-    '---',
-    '',
-    // Wrap in raw tags to avoid Liquid template tag processing.
-    '{% raw %}',
-    $.html().trim(),
-    '{% endraw %}',
-    ''
-  ].join('\n');
-
-  fs.writeFile(path.join(docPath, version + '.html'), html, util.pitch);
-}
-
-build();
--- a/lodash.js
+++ b/lodash.js
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@@ -1,66 +1,50 @@
 {
  "name": "lodash",
-  "version": "4.17.21",
+  "version": "5.0.0",
  "license": "MIT",
  "private": true,
-  "main": "lodash.js",
-  "engines": {
-    "node": ">=4.0.0"
-  },
+  "main": "dist/lodash.js",
+  "sideEffects": false,
  "scripts": {
-    "build": "npm run build:main && npm run build:fp",
-    "build:fp": "node lib/fp/build-dist.js",
-    "build:fp-modules": "node lib/fp/build-modules.js",
-    "build:main": "node lib/main/build-dist.js",
-    "build:main-modules": "node lib/main/build-modules.js",
-    "doc": "node lib/main/build-doc github && npm run test:doc",
-    "doc:fp": "node lib/fp/build-doc",
-    "doc:site": "node lib/main/build-doc site",
-    "doc:sitehtml": "optional-dev-dependency marky-markdown@^9.0.1 && npm run doc:site && node lib/main/build-site",
-    "pretest": "npm run build",
-    "style": "npm run style:main && npm run style:fp && npm run style:perf && npm run style:test",
-    "style:fp": "jscs fp/*.js lib/**/*.js",
-    "style:main": "jscs lodash.js",
-    "style:perf": "jscs perf/*.js perf/**/*.js",
-    "style:test": "jscs test/*.js test/**/*.js",
-    "test": "npm run test:main && npm run test:fp",
-    "test:doc": "markdown-doctest doc/*.md",
-    "test:fp": "node test/test-fp",
-    "test:main": "node test/test",
-    "validate": "npm run style && npm run test"
+    "prepare": "husky install",
+    "lint": "eslint ./src/**/*.ts"
  },
  "devDependencies": {
-    "async": "^2.6.3",
-    "benchmark": "^2.1.3",
-    "chalk": "^1.1.3",
-    "cheerio": "^0.22.0",
-    "codecov.io": "~0.1.6",
-    "coveralls": "^2.11.15",
-    "curl-amd": "~0.8.12",
-    "docdown": "~0.7.2",
-    "dojo": "^1.15.0",
-    "ecstatic": "^2.2.2",
-    "fs-extra": "~1.0.0",
-    "glob": "^7.1.4",
-    "istanbul": "0.4.5",
-    "jquery": "^3.4.1",
-    "jscs": "^3.0.7",
-    "lodash": "4.17.20",
-    "lodash-doc-globals": "^0.1.1",
-    "markdown-doctest": "^0.9.1",
-    "optional-dev-dependency": "^2.0.0",
-    "platform": "^1.3.3",
-    "qunit-extras": "^3.0.0",
-    "qunitjs": "^2.1.0",
-    "request": "^2.88.0",
-    "requirejs": "^2.3.6",
-    "sauce-tunnel": "^2.5.0",
-    "uglify-js": "2.7.5",
-    "webpack": "^1.14.0"
+    "@commitlint/cli": "17.7.1",
+    "@commitlint/config-conventional": "17.7.0",
+    "@types/eslint": "8.44.2",
+    "@types/jest": "29.5.5",
+    "@typescript-eslint/eslint-plugin": "6.7.0",
+    "@typescript-eslint/parser": "6.7.0",
+    "eslint": "8.49.0",
+    "eslint-config-airbnb-base": "15.0.0",
+    "eslint-config-airbnb-typescript": "17.1.0",
+    "eslint-config-prettier": "9.0.0",
+    "eslint-plugin-import": "2.28.1",
+    "eslint-plugin-prettier": "5.0.0",
+    "husky": "8.0.3",
+    "lint-staged": "14.0.1",
+    "lodash": "4.17.21",
+    "prettier": "3.0.3"
  },
-  "greenkeeper": {
-    "ignore": [
-      "lodash"
+  "lint-staged": {
+    "src/**/*.{ts}": [
+      "eslint --fix"
    ]
-  }
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged",
+      "commit-msg": "bun run commitlint --edit $1"
+    }
+  },
+  "engines": {
+    "node": "^18.17.1",
+    "yarn": "^1.22.19"
+  },
+  "volta": {
+    "node": "18.17.1",
+    "yarn": "1.22.19"
+  },
+  "engineStrict": true
 }
--- a/perf/asset/perf-ui.js
+++ b/perf/asset/perf-ui.js
@@ -1,112 +0,0 @@
-;(function(window) {
-  'use strict';
-
-  /** The base path of the lodash builds. */
-  var basePath = '../';
-
-  /** The lodash build to load. */
-  var build = (build = /build=([^&]+)/.exec(location.search)) && decodeURIComponent(build[1]);
-
-  /** The other library to load. */
-  var other = (other = /other=([^&]+)/.exec(location.search)) && decodeURIComponent(other[1]);
-
-  /** The `ui` object. */
-  var ui = {};
-
-  /*--------------------------------------------------------------------------*/
-
-  // Initialize controls.
-  addEventListener('load', function() {
-    function eventHandler(event) {
-      var buildIndex = buildList.selectedIndex,
-          otherIndex = otherList.selectedIndex,
-          search = location.search.replace(/^\?|&?(?:build|other)=[^&]*&?/g, '');
-
-      if (event.stopPropagation) {
-        event.stopPropagation();
-      } else {
-        event.cancelBubble = true;
-      }
-      location.href =
-        location.href.split('?')[0] + '?' +
-        (search ? search + '&' : '') +
-        'build=' + (buildIndex < 0 ? build : buildList[buildIndex].value) + '&' +
-        'other=' + (otherIndex < 0 ? other : otherList[otherIndex].value);
-    }
-
-    var span1 = document.createElement('span');
-    span1.style.cssText = 'float:right';
-    span1.innerHTML =
-      '<label for="perf-build">Build: </label>' +
-      '<select id="perf-build">' +
-      '<option value="lodash">lodash (production)</option>' +
-      '</select>';
-
-    var span2 = document.createElement('span');
-    span2.style.cssText = 'float:right';
-    span2.innerHTML =
-      '<label for="perf-other">Other Library: </label>' +
-      '<select id="perf-other">' +
-      '<option value="underscore-dev">Underscore (development)</option>' +
-      '<option value="underscore">Underscore (production)</option>' +
-      '<option value="lodash">lodash</option>' +
-      '</select>';
-
-    var buildList = span1.lastChild,
-        otherList = span2.lastChild,
-        toolbar = document.getElementById('perf-toolbar');
-
-    toolbar.appendChild(span2);
-    toolbar.appendChild(span1);
-
-    buildList.selectedIndex = (function() {
-      switch (build) {
-        case 'lodash':
-        case null:                return 0;
-      }
-      return -1;
-    }());
-
-    otherList.selectedIndex = (function() {
-      switch (other) {
-        case 'underscore-dev':    return 0;
-        case 'lodash':            return 2;
-        case 'underscore':
-        case null:                return 1;
-      }
-      return -1;
-    }());
-
-    buildList.addEventListener('change', eventHandler);
-    otherList.addEventListener('change', eventHandler);
-  });
-
-  // The lodash build file path.
-  ui.buildPath = (function() {
-    var result;
-    switch (build) {
-      case null:                build  = 'lodash';
-      case 'lodash':            result = 'dist/lodash.min.js'; break;
-      default:                  return build;
-    }
-    return basePath + result;
-  }());
-
-  // The other library file path.
-  ui.otherPath = (function() {
-    var result;
-    switch (other) {
-      case 'lodash':            result = 'dist/lodash.min.js'; break;
-      case 'underscore-dev':    result = 'vendor/underscore/underscore.js'; break;
-      case null:                other  = 'underscore';
-      case 'underscore':        result = 'vendor/underscore/underscore-min.js'; break;
-      default:                  return other;
-    }
-    return basePath + result;
-  }());
-
-  ui.urlParams = { 'build': build, 'other': other };
-
-  window.ui = ui;
-
-}(this));
--- a/perf/index.html
+++ b/perf/index.html
@@ -1,80 +0,0 @@
-<!doctype html>
-<html lang="en">
-  <head>
-    <meta charset="utf-8">
-    <title>lodash Performance Suite</title>
-    <style>
-      html, body {
-        margin: 0;
-        padding: 0;
-        height: 100%;
-      }
-      #FirebugUI {
-        top: 2.5em;
-      }
-      #perf-toolbar {
-        background-color: #EEE;
-        color: #5E740B;
-        font-family: "Helvetica Neue Light", "HelveticaNeue-Light", "Helvetica Neue", Calibri, Helvetica, Arial, sans-serif;
-        font-size: small;
-        padding: 0.5em 1em 0.5em 1em;
-        overflow: hidden;
-      }
-      #perf-toolbar label {
-        display: inline-block;
-        margin-right: 0.5em;
-      }
-      #perf-toolbar span {
-        display: inline-block;
-        float: right;
-        line-height: 2.1em;
-        margin-left: 1em;
-        margin-top: 0;
-      }
-    </style>
-  </head>
-  <body>
-    <div id="perf-toolbar"></div>
-    <script src="../lodash.js"></script>
-    <script src="../node_modules/platform/platform.js"></script>
-    <script src="../node_modules/benchmark/benchmark.js"></script>
-    <script src="../vendor/firebug-lite/src/firebug-lite-debug.js"></script>
-    <script src="./asset/perf-ui.js"></script>
-    <script>
-      document.write('<script src="' + ui.buildPath + '"><\/script>');
-    </script>
-    <script>
-      var lodash = _.noConflict();
-    </script>
-    <script>
-      document.write('<script src="' + ui.otherPath + '"><\/script>');
-    </script>
-    <script src="perf.js"></script>
-    <script>
-      (function() {
-        var measured,
-            perfNow,
-            begin = new Date;
-
-        function init() {
-          var fbUI = document.getElementById('FirebugUI'),
-              fbDoc = fbUI && (fbDoc = fbUI.contentWindow || fbUI.contentDocument).document || fbDoc,
-              fbCommandLine = fbDoc && fbDoc.getElementById('fbCommandLine');
-
-          if (!fbCommandLine) {
-            return setTimeout(init, 15);
-          }
-          fbUI.style.height = (
-            Math.max(document.documentElement.clientHeight, document.body.clientHeight) -
-            document.getElementById('perf-toolbar').clientHeight
-          ) + 'px';
-
-          fbDoc.body.style.height = fbDoc.documentElement.style.height = '100%';
-          setTimeout(run, 15);
-        }
-
-        window.onload = init;
-      }());
-    </script>
-  </body>
-</html>
--- a/perf/perf.js
+++ b/perf/perf.js
--- a/src/.eslintrc.cjs
+++ b/src/.eslintrc.cjs
@@ -0,0 +1,18 @@
+'use strict';
+
+const path = require('node:path');
+
+module.exports = {
+    overrides: [
+        {
+            files: ['**/*.{ts}'],
+            rules: {
+                'import/no-extraneous-dependencies': [
+                    'error',
+                    // Use package.json from both this package folder and root.
+                    { packageDir: [__dirname, path.join(__dirname, '../')] },
+                ],
+            },
+        },
+    ],
+};
--- a/src/.internal/Hash.ts
+++ b/src/.internal/Hash.ts
@@ -0,0 +1,88 @@
+/** Used to stand-in for `undefined` hash values. */
+const HASH_UNDEFINED = '__lodash_hash_undefined__'
+
+class Hash {
+
+  /**
+   * Creates a hash object.
+   *
+   * @private
+   * @constructor
+   * @param {Array} [entries] The key-value pairs to cache.
+   */
+  constructor(entries) {
+    let index = -1
+    const length = entries == null ? 0 : entries.length
+
+    this.clear()
+    while (++index < length) {
+      const entry = entries[index]
+      this.set(entry[0], entry[1])
+    }
+  }
+
+  /**
+   * Removes all key-value entries from the hash.
+   *
+   * @memberOf Hash
+   */
+  clear() {
+    this.__data__ = Object.create(null)
+    this.size = 0
+  }
+
+  /**
+   * Removes `key` and its value from the hash.
+   *
+   * @memberOf Hash
+   * @param {string} key The key of the value to remove.
+   * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+   */
+  delete(key) {
+    const result = this.has(key) && delete this.__data__[key]
+    this.size -= result ? 1 : 0
+    return result
+  }
+
+  /**
+   * Gets the hash value for `key`.
+   *
+   * @memberOf Hash
+   * @param {string} key The key of the value to get.
+   * @returns {*} Returns the entry value.
+   */
+  get(key) {
+    const data = this.__data__
+    const result = data[key]
+    return result === HASH_UNDEFINED ? undefined : result
+  }
+
+  /**
+   * Checks if a hash value for `key` exists.
+   *
+   * @memberOf Hash
+   * @param {string} key The key of the entry to check.
+   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+   */
+  has(key) {
+    const data = this.__data__
+    return data[key] !== undefined
+  }
+
+  /**
+   * Sets the hash `key` to `value`.
+   *
+   * @memberOf Hash
+   * @param {string} key The key of the value to set.
+   * @param {*} value The value to set.
+   * @returns {Object} Returns the hash instance.
+   */
+  set(key, value) {
+    const data = this.__data__
+    this.size += this.has(key) ? 0 : 1
+    data[key] = value === undefined ? HASH_UNDEFINED : value
+    return this
+  }
+}
+
+export default Hash
--- a/src/.internal/ListCache.ts
+++ b/src/.internal/ListCache.ts
@@ -0,0 +1,103 @@
+import assocIndexOf from './assocIndexOf.js'
+
+class ListCache {
+
+  /**
+   * Creates an list cache object.
+   *
+   * @private
+   * @constructor
+   * @param {Array} [entries] The key-value pairs to cache.
+   */
+  constructor(entries) {
+    let index = -1
+    const length = entries == null ? 0 : entries.length
+
+    this.clear()
+    while (++index < length) {
+      const entry = entries[index]
+      this.set(entry[0], entry[1])
+    }
+  }
+
+  /**
+   * Removes all key-value entries from the list cache.
+   *
+   * @memberOf ListCache
+   */
+  clear() {
+    this.__data__ = []
+    this.size = 0
+  }
+
+  /**
+   * Removes `key` and its value from the list cache.
+   *
+   * @memberOf ListCache
+   * @param {string} key The key of the value to remove.
+   * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+   */
+  delete(key) {
+    const data = this.__data__
+    const index = assocIndexOf(data, key)
+
+    if (index < 0) {
+      return false
+    }
+    const lastIndex = data.length - 1
+    if (index === lastIndex) {
+      data.pop()
+    } else {
+      data.splice(index, 1)
+    }
+    --this.size
+    return true
+  }
+
+  /**
+   * Gets the list cache value for `key`.
+   *
+   * @memberOf ListCache
+   * @param {string} key The key of the value to get.
+   * @returns {*} Returns the entry value.
+   */
+  get(key) {
+    const data = this.__data__
+    const index = assocIndexOf(data, key)
+    return index < 0 ? undefined : data[index][1]
+  }
+
+  /**
+   * Checks if a list cache value for `key` exists.
+   *
+   * @memberOf ListCache
+   * @param {string} key The key of the entry to check.
+   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+   */
+  has(key) {
+    return assocIndexOf(this.__data__, key) > -1
+  }
+
+  /**
+   * Sets the list cache `key` to `value`.
+   *
+   * @memberOf ListCache
+   * @param {string} key The key of the value to set.
+   * @param {*} value The value to set.
+   * @returns {Object} Returns the list cache instance.
+   */
+  set(key, value) {
+    const data = this.__data__
+    const index = assocIndexOf(data, key)
+
+    if (index < 0) {
+      ++this.size
+      data.push([key, value])
+    } else {
+      data[index][1] = value
+    }
+    return this
+  }
+}
+
+export default ListCache
--- a/src/.internal/MapCache.ts
+++ b/src/.internal/MapCache.ts
@@ -0,0 +1,120 @@
+
+import Hash from './Hash.js'
+
+/**
+ * Gets the data for `map`.
+ *
+ * @private
+ * @param {Object} map The map to query.
+ * @param {string} key The reference key.
+ * @returns {*} Returns the map data.
+ */
+function getMapData({ __data__ }, key) {
+  const data = __data__
+  return isKeyable(key)
+    ? data[typeof key === 'string' ? 'string' : 'hash']
+    : data.map
+}
+
+/**
+ * Checks if `value` is suitable for use as unique object key.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
+ */
+function isKeyable(value) {
+  const type = typeof value
+  return (type === 'string' || type === 'number' || type === 'symbol' || type === 'boolean')
+    ? (value !== '__proto__')
+    : (value === null)
+}
+
+class MapCache {
+
+  /**
+   * Creates a map cache object to store key-value pairs.
+   *
+   * @private
+   * @constructor
+   * @param {Array} [entries] The key-value pairs to cache.
+   */
+  constructor(entries) {
+    let index = -1
+    const length = entries == null ? 0 : entries.length
+
+    this.clear()
+    while (++index < length) {
+      const entry = entries[index]
+      this.set(entry[0], entry[1])
+    }
+  }
+
+  /**
+   * Removes all key-value entries from the map.
+   *
+   * @memberOf MapCache
+   */
+  clear() {
+    this.size = 0
+    this.__data__ = {
+      'hash': new Hash,
+      'map': new Map,
+      'string': new Hash
+    }
+  }
+
+  /**
+   * Removes `key` and its value from the map.
+   *
+   * @memberOf MapCache
+   * @param {string} key The key of the value to remove.
+   * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+   */
+  delete(key) {
+    const result = getMapData(this, key)['delete'](key)
+    this.size -= result ? 1 : 0
+    return result
+  }
+
+  /**
+   * Gets the map value for `key`.
+   *
+   * @memberOf MapCache
+   * @param {string} key The key of the value to get.
+   * @returns {*} Returns the entry value.
+   */
+  get(key) {
+    return getMapData(this, key).get(key)
+  }
+
+  /**
+   * Checks if a map value for `key` exists.
+   *
+   * @memberOf MapCache
+   * @param {string} key The key of the entry to check.
+   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+   */
+  has(key) {
+    return getMapData(this, key).has(key)
+  }
+
+  /**
+   * Sets the map `key` to `value`.
+   *
+   * @memberOf MapCache
+   * @param {string} key The key of the value to set.
+   * @param {*} value The value to set.
+   * @returns {Object} Returns the map cache instance.
+   */
+  set(key, value) {
+    const data = getMapData(this, key)
+    const size = data.size
+
+    data.set(key, value)
+    this.size += data.size === size ? 0 : 1
+    return this
+  }
+}
+
+export default MapCache
--- a/src/.internal/SetCache.ts
+++ b/src/.internal/SetCache.ts
@@ -0,0 +1,52 @@
+import MapCache from './MapCache.js'
+
+/** Used to stand-in for `undefined` hash values. */
+const HASH_UNDEFINED = '__lodash_hash_undefined__'
+
+class SetCache {
+
+  /**
+   * Creates an array cache object to store unique values.
+   *
+   * @private
+   * @constructor
+   * @param {Array} [values] The values to cache.
+   */
+  constructor(values) {
+    let index = -1
+    const length = values == null ? 0 : values.length
+
+    this.__data__ = new MapCache
+    while (++index < length) {
+      this.add(values[index])
+    }
+  }
+
+  /**
+   * Adds `value` to the array cache.
+   *
+   * @memberOf SetCache
+   * @alias push
+   * @param {*} value The value to cache.
+   * @returns {Object} Returns the cache instance.
+   */
+  add(value) {
+    this.__data__.set(value, HASH_UNDEFINED)
+    return this
+  }
+
+  /**
+   * Checks if `value` is in the array cache.
+   *
+   * @memberOf SetCache
+   * @param {*} value The value to search for.
+   * @returns {boolean} Returns `true` if `value` is found, else `false`.
+   */
+  has(value) {
+    return this.__data__.has(value)
+  }
+}
+
+SetCache.prototype.push = SetCache.prototype.add
+
+export default SetCache
--- a/src/.internal/Stack.ts
+++ b/src/.internal/Stack.ts
@@ -0,0 +1,93 @@
+import ListCache from './ListCache.js'
+import MapCache from './MapCache.js'
+
+/** Used as the size to enable large array optimizations. */
+const LARGE_ARRAY_SIZE = 200
+
+class Stack {
+
+  /**
+   * Creates a stack cache object to store key-value pairs.
+   *
+   * @private
+   * @constructor
+   * @param {Array} [entries] The key-value pairs to cache.
+   */
+  constructor(entries) {
+    const data = this.__data__ = new ListCache(entries)
+    this.size = data.size
+  }
+
+  /**
+   * Removes all key-value entries from the stack.
+   *
+   * @memberOf Stack
+   */
+  clear() {
+    this.__data__ = new ListCache
+    this.size = 0
+  }
+
+  /**
+   * Removes `key` and its value from the stack.
+   *
+   * @memberOf Stack
+   * @param {string} key The key of the value to remove.
+   * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+   */
+  delete(key) {
+    const data = this.__data__
+    const result = data['delete'](key)
+
+    this.size = data.size
+    return result
+  }
+
+  /**
+   * Gets the stack value for `key`.
+   *
+   * @memberOf Stack
+   * @param {string} key The key of the value to get.
+   * @returns {*} Returns the entry value.
+   */
+  get(key) {
+    return this.__data__.get(key)
+  }
+
+  /**
+   * Checks if a stack value for `key` exists.
+   *
+   * @memberOf Stack
+   * @param {string} key The key of the entry to check.
+   * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+   */
+  has(key) {
+    return this.__data__.has(key)
+  }
+
+  /**
+   * Sets the stack `key` to `value`.
+   *
+   * @memberOf Stack
+   * @param {string} key The key of the value to set.
+   * @param {*} value The value to set.
+   * @returns {Object} Returns the stack cache instance.
+   */
+  set(key, value) {
+    let data = this.__data__
+    if (data instanceof ListCache) {
+      const pairs = data.__data__
+      if (pairs.length < LARGE_ARRAY_SIZE - 1) {
+        pairs.push([key, value])
+        this.size = ++data.size
+        return this
+      }
+      data = this.__data__ = new MapCache(pairs)
+    }
+    data.set(key, value)
+    this.size = data.size
+    return this
+  }
+}
+
+export default Stack
--- a/src/.internal/addMapEntry.ts
+++ b/src/.internal/addMapEntry.ts
@@ -0,0 +1,15 @@
+/**
+ * Adds the key-value `pair` to `map`.
+ *
+ * @private
+ * @param {Object} map The map to modify.
+ * @param {Array} pair The key-value pair to add.
+ * @returns {Object} Returns `map`.
+ */
+function addMapEntry(map, pair) {
+  // Don't return `map.set` because it's not chainable in IE 11.
+  map.set(pair[0], pair[1])
+  return map
+}
+
+export default addMapEntry
--- a/src/.internal/addSetEntry.ts
+++ b/src/.internal/addSetEntry.ts
@@ -0,0 +1,15 @@
+/**
+ * Adds `value` to `set`.
+ *
+ * @private
+ * @param {Object} set The set to modify.
+ * @param {*} value The value to add.
+ * @returns {Object} Returns `set`.
+ */
+function addSetEntry(set, value) {
+  // Don't return `set.add` because it's not chainable in IE 11.
+  set.add(value)
+  return set
+}
+
+export default addSetEntry
--- a/src/.internal/arrayEach.ts
+++ b/src/.internal/arrayEach.ts
@@ -0,0 +1,21 @@
+/**
+ * A specialized version of `forEach` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns `array`.
+ */
+function arrayEach(array, iteratee) {
+  let index = -1
+  const length = array.length
+
+  while (++index < length) {
+    if (iteratee(array[index], index, array) === false) {
+      break
+    }
+  }
+  return array
+}
+
+export default arrayEach
--- a/src/.internal/arrayEachRight.ts
+++ b/src/.internal/arrayEachRight.ts
@@ -0,0 +1,20 @@
+/**
+ * A specialized version of `forEachRight` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array} Returns `array`.
+ */
+function arrayEachRight(array, iteratee) {
+  let length = array == null ? 0 : array.length
+
+  while (length--) {
+    if (iteratee(array[length], length, array) === false) {
+      break
+    }
+  }
+  return array
+}
+
+export default arrayEachRight
--- a/src/.internal/arrayIncludes.ts
+++ b/src/.internal/arrayIncludes.ts
@@ -0,0 +1,17 @@
+import baseIndexOf from './baseIndexOf.js'
+
+/**
+ * A specialized version of `includes` for arrays without support for
+ * specifying an index to search from.
+ *
+ * @private
+ * @param {Array} [array] The array to inspect.
+ * @param {*} target The value to search for.
+ * @returns {boolean} Returns `true` if `target` is found, else `false`.
+ */
+function arrayIncludes(array, value) {
+  const length = array == null ? 0 : array.length
+  return !!length && baseIndexOf(array, value, 0) > -1
+}
+
+export default arrayIncludes
--- a/src/.internal/arrayIncludesWith.ts
+++ b/src/.internal/arrayIncludesWith.ts
@@ -0,0 +1,23 @@
+/**
+ * This function is like `arrayIncludes` except that it accepts a comparator.
+ *
+ * @private
+ * @param {Array} [array] The array to inspect.
+ * @param {*} target The value to search for.
+ * @param {Function} comparator The comparator invoked per element.
+ * @returns {boolean} Returns `true` if `target` is found, else `false`.
+ */
+function arrayIncludesWith(array, target, comparator) {
+  if (array == null) {
+    return false
+  }
+
+  for (const value of array) {
+    if (comparator(target, value)) {
+      return true
+    }
+  }
+  return false
+}
+
+export default arrayIncludesWith
--- a/src/.internal/arrayLikeKeys.ts
+++ b/src/.internal/arrayLikeKeys.ts
@@ -0,0 +1,43 @@
+import isArguments from '../isArguments.js'
+import isBuffer from '../isBuffer.js'
+import isIndex from './isIndex.js'
+import isTypedArray from '../isTypedArray.js'
+
+/** Used to check objects for own properties. */
+const hasOwnProperty = Object.prototype.hasOwnProperty
+
+/**
+ * Creates an array of the enumerable property names of the array-like `value`.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @param {boolean} inherited Specify returning inherited property names.
+ * @returns {Array} Returns the array of property names.
+ */
+function arrayLikeKeys(value, inherited) {
+  const isArr = Array.isArray(value)
+  const isArg = !isArr && isArguments(value)
+  const isBuff = !isArr && !isArg && isBuffer(value)
+  const isType = !isArr && !isArg && !isBuff && isTypedArray(value)
+  const skipIndexes = isArr || isArg || isBuff || isType
+  const length = value.length
+  const result = new Array(skipIndexes ? length : 0)
+  let index = skipIndexes ? -1 : length
+  while (++index < length) {
+    result[index] = `${index}`
+  }
+  for (const key in value) {
+    if ((inherited || hasOwnProperty.call(value, key)) &&
+        !(skipIndexes && (
+        // Safari 9 has enumerable `arguments.length` in strict mode.
+          (key === 'length' ||
+           // Skip index properties.
+           isIndex(key, length))
+        ))) {
+      result.push(key)
+    }
+  }
+  return result
+}
+
+export default arrayLikeKeys
--- a/src/.internal/arrayReduce.ts
+++ b/src/.internal/arrayReduce.ts
@@ -0,0 +1,25 @@
+/**
+ * A specialized version of `reduce` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {boolean} [initAccum] Specify using the first element of `array` as
+ *  the initial value.
+ * @returns {*} Returns the accumulated value.
+ */
+function arrayReduce(array, iteratee, accumulator, initAccum) {
+  let index = -1
+  const length = array == null ? 0 : array.length
+
+  if (initAccum && length) {
+    accumulator = array[++index]
+  }
+  while (++index < length) {
+    accumulator = iteratee(accumulator, array[index], index, array)
+  }
+  return accumulator
+}
+
+export default arrayReduce
--- a/src/.internal/arrayReduceRight.ts
+++ b/src/.internal/arrayReduceRight.ts
@@ -0,0 +1,23 @@
+/**
+ * A specialized version of `reduceRight` for arrays.
+ *
+ * @private
+ * @param {Array} [array] The array to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {*} [accumulator] The initial value.
+ * @param {boolean} [initAccum] Specify using the last element of `array` as
+ *  the initial value.
+ * @returns {*} Returns the accumulated value.
+ */
+function arrayReduceRight(array, iteratee, accumulator, initAccum) {
+  let length = array == null ? 0 : array.length
+  if (initAccum && length) {
+    accumulator = array[--length]
+  }
+  while (length--) {
+    accumulator = iteratee(accumulator, array[length], length, array)
+  }
+  return accumulator
+}
+
+export default arrayReduceRight
--- a/src/.internal/asciiSize.ts
+++ b/src/.internal/asciiSize.ts
@@ -0,0 +1,12 @@
+/**
+ * Gets the size of an ASCII `string`.
+ *
+ * @private
+ * @param {string} string The string inspect.
+ * @returns {number} Returns the string size.
+ */
+function asciiSize({ length }) {
+  return length
+}
+
+export default asciiSize
--- a/src/.internal/asciiToArray.ts
+++ b/src/.internal/asciiToArray.ts
@@ -0,0 +1,12 @@
+/**
+ * Converts an ASCII `string` to an array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the converted array.
+ */
+function asciiToArray(string) {
+  return string.split('')
+}
+
+export default asciiToArray
--- a/src/.internal/assignMergeValue.ts
+++ b/src/.internal/assignMergeValue.ts
@@ -0,0 +1,20 @@
+import baseAssignValue from './baseAssignValue.js'
+import eq from '../eq.js'
+
+/**
+ * This function is like `assignValue` except that it doesn't assign
+ * `undefined` values.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+function assignMergeValue(object, key, value) {
+  if ((value !== undefined && !eq(object[key], value)) ||
+      (value === undefined && !(key in object))) {
+    baseAssignValue(object, key, value)
+  }
+}
+
+export default assignMergeValue
--- a/src/.internal/assignValue.ts
+++ b/src/.internal/assignValue.ts
@@ -0,0 +1,27 @@
+import baseAssignValue from './baseAssignValue.js'
+import eq from '../eq.js'
+
+/** Used to check objects for own properties. */
+const hasOwnProperty = Object.prototype.hasOwnProperty
+
+/**
+ * Assigns `value` to `key` of `object` if the existing value is not equivalent.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+function assignValue(object, key, value) {
+  const objValue = object[key]
+
+  if (!(hasOwnProperty.call(object, key) && eq(objValue, value))) {
+    if (value !== 0 || (1 / value) === (1 / objValue)) {
+      baseAssignValue(object, key, value)
+    }
+  } else if (value === undefined && !(key in object)) {
+    baseAssignValue(object, key, value)
+  }
+}
+
+export default assignValue
--- a/src/.internal/assocIndexOf.ts
+++ b/src/.internal/assocIndexOf.ts
@@ -0,0 +1,21 @@
+import eq from '../eq.js'
+
+/**
+ * Gets the index at which the `key` is found in `array` of key-value pairs.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} key The key to search for.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function assocIndexOf(array, key) {
+  let { length } = array
+  while (length--) {
+    if (eq(array[length][0], key)) {
+      return length
+    }
+  }
+  return -1
+}
+
+export default assocIndexOf
--- a/src/.internal/baseAssignValue.ts
+++ b/src/.internal/baseAssignValue.ts
@@ -0,0 +1,23 @@
+/**
+ * The base implementation of `assignValue` and `assignMergeValue` without
+ * value checks.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+function baseAssignValue(object, key, value) {
+  if (key === '__proto__') {
+    Object.defineProperty(object, key, {
+      'configurable': true,
+      'enumerable': true,
+      'value': value,
+      'writable': true
+    })
+  } else {
+    object[key] = value
+  }
+}
+
+export default baseAssignValue
--- a/src/.internal/baseAt.ts
+++ b/src/.internal/baseAt.ts
@@ -0,0 +1,23 @@
+import get from '../get.js'
+
+/**
+ * The base implementation of `at` without support for individual paths.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {string[]} paths The property paths to pick.
+ * @returns {Array} Returns the picked elements.
+ */
+function baseAt(object, paths) {
+  let index = -1
+  const length = paths.length
+  const result = new Array(length)
+  const skip = object == null
+
+  while (++index < length) {
+    result[index] = skip ? undefined : get(object, paths[index])
+  }
+  return result
+}
+
+export default baseAt
--- a/src/.internal/baseClone.ts
+++ b/src/.internal/baseClone.ts
@@ -0,0 +1,241 @@
+import Stack from './Stack.js'
+import arrayEach from './arrayEach.js'
+import assignValue from './assignValue.js'
+import cloneBuffer from './cloneBuffer.js'
+import copyArray from './copyArray.js'
+import copyObject from './copyObject.js'
+import cloneArrayBuffer from './cloneArrayBuffer.js'
+import cloneDataView from './cloneDataView.js'
+import cloneRegExp from './cloneRegExp.js'
+import cloneSymbol from './cloneSymbol.js'
+import cloneTypedArray from './cloneTypedArray.js'
+import copySymbols from './copySymbols.js'
+import copySymbolsIn from './copySymbolsIn.js'
+import getAllKeys from './getAllKeys.js'
+import getAllKeysIn from './getAllKeysIn.js'
+import getTag from './getTag.js'
+import initCloneObject from './initCloneObject.js'
+import isBuffer from '../isBuffer.js'
+import isObject from '../isObject.js'
+import isTypedArray from '../isTypedArray.js'
+import keys from '../keys.js'
+import keysIn from '../keysIn.js'
+
+/** Used to compose bitmasks for cloning. */
+const CLONE_DEEP_FLAG = 1
+const CLONE_FLAT_FLAG = 2
+const CLONE_SYMBOLS_FLAG = 4
+
+/** `Object#toString` result references. */
+const argsTag = '[object Arguments]'
+const arrayTag = '[object Array]'
+const boolTag = '[object Boolean]'
+const dateTag = '[object Date]'
+const errorTag = '[object Error]'
+const mapTag = '[object Map]'
+const numberTag = '[object Number]'
+const objectTag = '[object Object]'
+const regexpTag = '[object RegExp]'
+const setTag = '[object Set]'
+const stringTag = '[object String]'
+const symbolTag = '[object Symbol]'
+const weakMapTag = '[object WeakMap]'
+
+const arrayBufferTag = '[object ArrayBuffer]'
+const dataViewTag = '[object DataView]'
+const float32Tag = '[object Float32Array]'
+const float64Tag = '[object Float64Array]'
+const int8Tag = '[object Int8Array]'
+const int16Tag = '[object Int16Array]'
+const int32Tag = '[object Int32Array]'
+const uint8Tag = '[object Uint8Array]'
+const uint8ClampedTag = '[object Uint8ClampedArray]'
+const uint16Tag = '[object Uint16Array]'
+const uint32Tag = '[object Uint32Array]'
+
+/** Used to identify `toStringTag` values supported by `clone`. */
+const cloneableTags = {}
+cloneableTags[argsTag] = cloneableTags[arrayTag] =
+cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
+cloneableTags[boolTag] = cloneableTags[dateTag] =
+cloneableTags[float32Tag] = cloneableTags[float64Tag] =
+cloneableTags[int8Tag] = cloneableTags[int16Tag] =
+cloneableTags[int32Tag] = cloneableTags[mapTag] =
+cloneableTags[numberTag] = cloneableTags[objectTag] =
+cloneableTags[regexpTag] = cloneableTags[setTag] =
+cloneableTags[stringTag] = cloneableTags[symbolTag] =
+cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
+cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true
+cloneableTags[errorTag] = cloneableTags[weakMapTag] = false
+
+/** Used to check objects for own properties. */
+const hasOwnProperty = Object.prototype.hasOwnProperty
+
+/**
+ * Initializes an object clone based on its `toStringTag`.
+ *
+ * **Note:** This function only supports cloning values with tags of
+ * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @param {string} tag The `toStringTag` of the object to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+function initCloneByTag(object, tag, isDeep) {
+  const Ctor = object.constructor
+  switch (tag) {
+    case arrayBufferTag:
+      return cloneArrayBuffer(object)
+
+    case boolTag:
+    case dateTag:
+      return new Ctor(+object)
+
+    case dataViewTag:
+      return cloneDataView(object, isDeep)
+
+    case float32Tag: case float64Tag:
+    case int8Tag: case int16Tag: case int32Tag:
+    case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
+      return cloneTypedArray(object, isDeep)
+
+    case mapTag:
+      return new Ctor
+
+    case numberTag:
+    case stringTag:
+      return new Ctor(object)
+
+    case regexpTag:
+      return cloneRegExp(object)
+
+    case setTag:
+      return new Ctor
+
+    case symbolTag:
+      return cloneSymbol(object)
+  }
+}
+
+/**
+ * Initializes an array clone.
+ *
+ * @private
+ * @param {Array} array The array to clone.
+ * @returns {Array} Returns the initialized clone.
+ */
+function initCloneArray(array) {
+  const { length } = array
+  const result = new array.constructor(length)
+
+  // Add properties assigned by `RegExp#exec`.
+  if (length && typeof array[0] === 'string' && hasOwnProperty.call(array, 'index')) {
+    result.index = array.index
+    result.input = array.input
+  }
+  return result
+}
+
+/**
+ * The base implementation of `clone` and `cloneDeep` which tracks
+ * traversed objects.
+ *
+ * @private
+ * @param {*} value The value to clone.
+ * @param {number} bitmask The bitmask flags.
+ *  1 - Deep clone
+ *  2 - Flatten inherited properties
+ *  4 - Clone symbols
+ * @param {Function} [customizer] The function to customize cloning.
+ * @param {string} [key] The key of `value`.
+ * @param {Object} [object] The parent object of `value`.
+ * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
+ * @returns {*} Returns the cloned value.
+ */
+function baseClone(value, bitmask, customizer, key, object, stack) {
+  let result
+  const isDeep = bitmask & CLONE_DEEP_FLAG
+  const isFlat = bitmask & CLONE_FLAT_FLAG
+  const isFull = bitmask & CLONE_SYMBOLS_FLAG
+
+  if (customizer) {
+    result = object ? customizer(value, key, object, stack) : customizer(value)
+  }
+  if (result !== undefined) {
+    return result
+  }
+  if (!isObject(value)) {
+    return value
+  }
+  const isArr = Array.isArray(value)
+  const tag = getTag(value)
+  if (isArr) {
+    result = initCloneArray(value)
+    if (!isDeep) {
+      return copyArray(value, result)
+    }
+  } else {
+    const isFunc = typeof value === 'function'
+
+    if (isBuffer(value)) {
+      return cloneBuffer(value, isDeep)
+    }
+    if (tag === objectTag || tag === argsTag || (isFunc && !object)) {
+      result = (isFlat || isFunc) ? {} : initCloneObject(value)
+      if (!isDeep) {
+        return isFlat
+          ? copySymbolsIn(value, copyObject(value, keysIn(value), result))
+          : copySymbols(value, Object.assign(result, value))
+      }
+    } else {
+      if (isFunc || !cloneableTags[tag]) {
+        return object ? value : {}
+      }
+      result = initCloneByTag(value, tag, isDeep)
+    }
+  }
+  // Check for circular references and return its corresponding clone.
+  stack || (stack = new Stack)
+  const stacked = stack.get(value)
+  if (stacked) {
+    return stacked
+  }
+  stack.set(value, result)
+
+  if (tag === mapTag) {
+    value.forEach((subValue, key) => {
+      result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack))
+    })
+    return result
+  }
+
+  if (tag === setTag) {
+    value.forEach((subValue) => {
+      result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack))
+    })
+    return result
+  }
+
+  if (isTypedArray(value)) {
+    return result
+  }
+
+  const keysFunc = isFull
+    ? (isFlat ? getAllKeysIn : getAllKeys)
+    : (isFlat ? keysIn : keys)
+
+  const props = isArr ? undefined : keysFunc(value)
+  arrayEach(props || value, (subValue, key) => {
+    if (props) {
+      key = subValue
+      subValue = value[key]
+    }
+    // Recursively populate clone (susceptible to call stack limits).
+    assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack))
+  })
+  return result
+}
+
+export default baseClone
--- a/src/.internal/baseConforms.ts
+++ b/src/.internal/baseConforms.ts
@@ -0,0 +1,16 @@
+import baseConformsTo from './baseConformsTo.js'
+import keys from '../keys.js'
+
+/**
+ * The base implementation of `conforms` which doesn't clone `source`.
+ *
+ * @private
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {Function} Returns the new spec function.
+ */
+function baseConforms(source) {
+  const props = keys(source)
+  return (object) => baseConformsTo(object, source, props)
+}
+
+export default baseConforms
--- a/src/.internal/baseConformsTo.ts
+++ b/src/.internal/baseConformsTo.ts
@@ -0,0 +1,27 @@
+/**
+ * The base implementation of `conformsTo` which accepts `props` to check.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {boolean} Returns `true` if `object` conforms, else `false`.
+ */
+function baseConformsTo(object, source, props) {
+  let length = props.length
+  if (object == null) {
+    return !length
+  }
+  object = Object(object)
+  while (length--) {
+    const key = props[length]
+    const predicate = source[key]
+    const value = object[key]
+
+    if ((value === undefined && !(key in object)) || !predicate(value)) {
+      return false
+    }
+  }
+  return true
+}
+
+export default baseConformsTo
--- a/src/.internal/baseDifference.ts
+++ b/src/.internal/baseDifference.ts
@@ -0,0 +1,63 @@
+import SetCache from './SetCache.js'
+import arrayIncludes from './arrayIncludes.js'
+import arrayIncludesWith from './arrayIncludesWith.js'
+import map from '../map.js'
+import cacheHas from './cacheHas.js'
+
+/** Used as the size to enable large array optimizations. */
+const LARGE_ARRAY_SIZE = 200
+
+/**
+ * The base implementation of methods like `difference` without support
+ * for excluding multiple arrays.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Array} values The values to exclude.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of filtered values.
+ */
+function baseDifference(array, values, iteratee, comparator) {
+  let includes = arrayIncludes
+  let isCommon = true
+  const result = []
+  const valuesLength = values.length
+
+  if (!array.length) {
+    return result
+  }
+  if (iteratee) {
+    values = map(values, (value) => iteratee(value))
+  }
+  if (comparator) {
+    includes = arrayIncludesWith
+    isCommon = false
+  }
+  else if (values.length >= LARGE_ARRAY_SIZE) {
+    includes = cacheHas
+    isCommon = false
+    values = new SetCache(values)
+  }
+  outer:
+  for (let value of array) {
+    const computed = iteratee == null ? value : iteratee(value)
+
+    value = (comparator || value !== 0) ? value : 0
+    if (isCommon && computed === computed) {
+      let valuesIndex = valuesLength
+      while (valuesIndex--) {
+        if (values[valuesIndex] === computed) {
+          continue outer
+        }
+      }
+      result.push(value)
+    }
+    else if (!includes(values, computed, comparator)) {
+      result.push(value)
+    }
+  }
+  return result
+}
+
+export default baseDifference
--- a/src/.internal/baseEach.ts
+++ b/src/.internal/baseEach.ts
@@ -0,0 +1,31 @@
+import baseForOwn from './baseForOwn.js'
+import isArrayLike from '../isArrayLike.js'
+
+/**
+ * The base implementation of `forEach`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object} Returns `collection`.
+ */
+function baseEach(collection, iteratee) {
+  if (collection == null) {
+    return collection
+  }
+  if (!isArrayLike(collection)) {
+    return baseForOwn(collection, iteratee)
+  }
+  const length = collection.length
+  const iterable = Object(collection)
+  let index = -1
+
+  while (++index < length) {
+    if (iteratee(iterable[index], index, iterable) === false) {
+      break
+    }
+  }
+  return collection
+}
+
+export default baseEach
--- a/src/.internal/baseEachRight.ts
+++ b/src/.internal/baseEachRight.ts
@@ -0,0 +1,30 @@
+import baseForOwnRight from './baseForOwnRight.js'
+import isArrayLike from '../isArrayLike.js'
+
+/**
+ * The base implementation of `forEachRight`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Array|Object} Returns `collection`.
+ */
+function baseEachRight(collection, iteratee) {
+  if (collection == null) {
+    return collection
+  }
+  if (!isArrayLike(collection)) {
+    return baseForOwnRight(collection, iteratee)
+  }
+  const iterable = Object(collection)
+  let length = collection.length
+
+  while (length--) {
+    if (iteratee(iterable[length], length, iterable) === false) {
+      break
+    }
+  }
+  return collection
+}
+
+export default baseEachRight
--- a/src/.internal/baseFindIndex.ts
+++ b/src/.internal/baseFindIndex.ts
@@ -0,0 +1,23 @@
+/**
+ * The base implementation of `findIndex` and `findLastIndex`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {number} fromIndex The index to search from.
+ * @param {boolean} [fromRight] Specify iterating from right to left.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function baseFindIndex(array, predicate, fromIndex, fromRight) {
+  const { length } = array
+  let index = fromIndex + (fromRight ? 1 : -1)
+
+  while ((fromRight ? index-- : ++index < length)) {
+    if (predicate(array[index], index, array)) {
+      return index
+    }
+  }
+  return -1
+}
+
+export default baseFindIndex
--- a/src/.internal/baseFindKey.ts
+++ b/src/.internal/baseFindKey.ts
@@ -0,0 +1,22 @@
+/**
+ * The base implementation of methods like `findKey` and `findLastKey`
+ * which iterates over `collection` using `eachFunc`.
+ *
+ * @private
+ * @param {Array|Object} collection The collection to inspect.
+ * @param {Function} predicate The function invoked per iteration.
+ * @param {Function} eachFunc The function to iterate over `collection`.
+ * @returns {*} Returns the found element or its key, else `undefined`.
+ */
+function baseFindKey(collection, predicate, eachFunc) {
+  let result
+  eachFunc(collection, (value, key, collection) => {
+    if (predicate(value, key, collection)) {
+      result = key
+      return false
+    }
+  })
+  return result
+}
+
+export default baseFindKey
--- a/src/.internal/baseFlatten.ts
+++ b/src/.internal/baseFlatten.ts
@@ -0,0 +1,37 @@
+import isFlattenable from './isFlattenable.js'
+
+/**
+ * The base implementation of `flatten` with support for restricting flattening.
+ *
+ * @private
+ * @param {Array} array The array to flatten.
+ * @param {number} depth The maximum recursion depth.
+ * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
+ * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
+ * @param {Array} [result=[]] The initial result value.
+ * @returns {Array} Returns the new flattened array.
+ */
+function baseFlatten(array, depth, predicate, isStrict, result) {
+  predicate || (predicate = isFlattenable)
+  result || (result = [])
+
+  if (array == null) {
+    return result
+  }
+
+  for (const value of array) {
+    if (depth > 0 && predicate(value)) {
+      if (depth > 1) {
+        // Recursively flatten arrays (susceptible to call stack limits).
+        baseFlatten(value, depth - 1, predicate, isStrict, result)
+      } else {
+        result.push(...value)
+      }
+    } else if (!isStrict) {
+      result[result.length] = value
+    }
+  }
+  return result
+}
+
+export default baseFlatten
--- a/src/.internal/baseFor.ts
+++ b/src/.internal/baseFor.ts
@@ -0,0 +1,27 @@
+/**
+ * The base implementation of `baseForOwn` which iterates over `object`
+ * properties returned by `keysFunc` and invokes `iteratee` for each property.
+ * Iteratee functions may exit iteration early by explicitly returning `false`.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} keysFunc The function to get the keys of `object`.
+ * @returns {Object} Returns `object`.
+ */
+function baseFor(object, iteratee, keysFunc) {
+  const iterable = Object(object)
+  const props = keysFunc(object)
+  let { length } = props
+  let index = -1
+
+  while (length--) {
+    const key = props[++index]
+    if (iteratee(iterable[key], key, iterable) === false) {
+      break
+    }
+  }
+  return object
+}
+
+export default baseFor
--- a/src/.internal/baseForOwn.ts
+++ b/src/.internal/baseForOwn.ts
@@ -0,0 +1,16 @@
+import baseFor from './baseFor.js'
+import keys from '../keys.js'
+
+/**
+ * The base implementation of `forOwn`.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ */
+function baseForOwn(object, iteratee) {
+  return object && baseFor(object, iteratee, keys)
+}
+
+export default baseForOwn
--- a/src/.internal/baseForOwnRight.ts
+++ b/src/.internal/baseForOwnRight.ts
@@ -0,0 +1,16 @@
+import baseForRight from './baseForRight.js'
+import keys from '../keys.js'
+
+/**
+ * The base implementation of `forOwnRight`.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ */
+function baseForOwnRight(object, iteratee) {
+  return object && baseForRight(object, iteratee, keys)
+}
+
+export default baseForOwnRight
--- a/src/.internal/baseForRight.ts
+++ b/src/.internal/baseForRight.ts
@@ -0,0 +1,25 @@
+/**
+ * This function is like `baseFor` except that it iterates over properties
+ * in the opposite order.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @param {Function} keysFunc The function to get the keys of `object`.
+ * @returns {Object} Returns `object`.
+ */
+function baseForRight(object, iteratee, keysFunc) {
+  const iterable = Object(object)
+  const props = keysFunc(object)
+  let { length } = props
+
+  while (length--) {
+    const key = props[length]
+    if (iteratee(iterable[key], key, iterable) === false) {
+      break
+    }
+  }
+  return object
+}
+
+export default baseForRight
--- a/src/.internal/baseGet.ts
+++ b/src/.internal/baseGet.ts
@@ -0,0 +1,24 @@
+import castPath from './castPath.js'
+import toKey from './toKey.js'
+
+/**
+ * The base implementation of `get` without support for default values.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to get.
+ * @returns {*} Returns the resolved value.
+ */
+function baseGet(object, path) {
+  path = castPath(path, object)
+
+  let index = 0
+  const length = path.length
+
+  while (object != null && index < length) {
+    object = object[toKey(path[index++])]
+  }
+  return (index && index === length) ? object : undefined
+}
+
+export default baseGet
--- a/src/.internal/baseInRange.ts
+++ b/src/.internal/baseInRange.ts
@@ -0,0 +1,14 @@
+/**
+ * The base implementation of `inRange` which doesn't coerce arguments.
+ *
+ * @private
+ * @param {number} number The number to check.
+ * @param {number} start The start of the range.
+ * @param {number} end The end of the range.
+ * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
+ */
+function baseInRange(number, start, end) {
+  return number >= Math.min(start, end) && number < Math.max(start, end)
+}
+
+export default baseInRange
--- a/src/.internal/baseIndexOf.ts
+++ b/src/.internal/baseIndexOf.ts
@@ -0,0 +1,20 @@
+import baseFindIndex from './baseFindIndex.js'
+import baseIsNaN from './baseIsNaN.js'
+import strictIndexOf from './strictIndexOf.js'
+
+/**
+ * The base implementation of `indexOf` without `fromIndex` bounds checks.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function baseIndexOf(array, value, fromIndex) {
+  return value === value
+    ? strictIndexOf(array, value, fromIndex)
+    : baseFindIndex(array, baseIsNaN, fromIndex)
+}
+
+export default baseIndexOf
--- a/src/.internal/baseIndexOfWith.ts
+++ b/src/.internal/baseIndexOfWith.ts
@@ -0,0 +1,23 @@
+/**
+ * This function is like `baseIndexOf` except that it accepts a comparator.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @param {Function} comparator The comparator invoked per element.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function baseIndexOfWith(array, value, fromIndex, comparator) {
+  let index = fromIndex - 1
+  const { length } = array
+
+  while (++index < length) {
+    if (comparator(array[index], value)) {
+      return index
+    }
+  }
+  return -1
+}
+
+export default baseIndexOfWith
--- a/src/.internal/baseIntersection.ts
+++ b/src/.internal/baseIntersection.ts
@@ -0,0 +1,72 @@
+import SetCache from './SetCache.js'
+import arrayIncludes from './arrayIncludes.js'
+import arrayIncludesWith from './arrayIncludesWith.js'
+import map from '../map.js'
+import cacheHas from './cacheHas.js'
+
+/**
+ * The base implementation of methods like `intersection` that accepts an
+ * array of arrays to inspect.
+ *
+ * @private
+ * @param {Array} arrays The arrays to inspect.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns the new array of shared values.
+ */
+function baseIntersection(arrays, iteratee, comparator) {
+  const includes = comparator ? arrayIncludesWith : arrayIncludes
+  const length = arrays[0].length
+  const othLength = arrays.length
+  const caches = new Array(othLength)
+  const result = []
+
+  let array
+  let maxLength = Infinity
+  let othIndex = othLength
+
+  while (othIndex--) {
+    array = arrays[othIndex]
+    if (othIndex && iteratee) {
+      array = map(array, (value) => iteratee(value))
+    }
+    maxLength = Math.min(array.length, maxLength)
+    caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
+      ? new SetCache(othIndex && array)
+      : undefined
+  }
+  array = arrays[0]
+
+  let index = -1
+  const seen = caches[0]
+
+  outer:
+  while (++index < length && result.length < maxLength) {
+    let value = array[index]
+    const computed = iteratee ? iteratee(value) : value
+
+    value = (comparator || value !== 0) ? value : 0
+    if (!(seen
+      ? cacheHas(seen, computed)
+      : includes(result, computed, comparator)
+    )) {
+      othIndex = othLength
+      while (--othIndex) {
+        const cache = caches[othIndex]
+        if (!(cache
+          ? cacheHas(cache, computed)
+          : includes(arrays[othIndex], computed, comparator))
+        ) {
+          continue outer
+        }
+      }
+      if (seen) {
+        seen.push(computed)
+      }
+      result.push(value)
+    }
+  }
+  return result
+}
+
+export default baseIntersection
--- a/src/.internal/baseIsEqual.ts
+++ b/src/.internal/baseIsEqual.ts
@@ -0,0 +1,28 @@
+import baseIsEqualDeep from './baseIsEqualDeep.js'
+import isObjectLike from '../isObjectLike.js'
+
+/**
+ * The base implementation of `isEqual` which supports partial comparisons
+ * and tracks traversed objects.
+ *
+ * @private
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @param {boolean} bitmask The bitmask flags.
+ *  1 - Unordered comparison
+ *  2 - Partial comparison
+ * @param {Function} [customizer] The function to customize comparisons.
+ * @param {Object} [stack] Tracks traversed `value` and `other` objects.
+ * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+ */
+function baseIsEqual(value, other, bitmask, customizer, stack) {
+  if (value === other) {
+    return true
+  }
+  if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
+    return value !== value && other !== other
+  }
+  return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack)
+}
+
+export default baseIsEqual
--- a/Show More
+++ b/Show More