Consolidate invert modules.

.internal/baseInverter.js

@@ -1,21 +0,0 @@
-import baseForOwn from './baseForOwn.js';
-
-/**
- * The base implementation of `invert` and `invertBy` which inverts
- * `object` with values transformed by `iteratee` and set by `setter`.
- *
- * @private
- * @param {Object} object The object to iterate over.
- * @param {Function} setter The function to set `accumulator` values.
- * @param {Function} iteratee The iteratee to transform values.
- * @param {Object} accumulator The initial inverted object.
- * @returns {Function} Returns `accumulator`.
- */
-function baseInverter(object, setter, iteratee, accumulator) {
-  baseForOwn(object, (value, key, object) => {
-    setter(accumulator, iteratee(value), key, object);
-  });
-  return accumulator;
-}
-
-export default baseInverter;

.internal/createInverter.js

@@ -1,14 +0,0 @@
-import baseInverter from './.internal/baseInverter.js';
-
-/**
- * Creates a function like `invertBy`.
- *
- * @private
- * @param {Function} setter The function to set accumulator values.
- * @returns {Function} Returns the new inverter function.
- */
-function createInverter(setter) {
-  return (object, iteratee) => baseInverter(object, setter, iteratee, {});
-}
-
-export default createInverter;

invert.js

@@ -1,6 +1,4 @@
-import constant from './constant.js';
-import createInverter from './.internal/createInverter.js';
-import identity from './identity.js';
+import baseForOwn from './baseForOwn.js';
 
 /**
  * Creates an object composed of the inverted keys and values of `object`.
@@ -18,8 +16,12 @@ import identity from './identity.js';
  * invert(object);
  * // => { '1': 'c', '2': 'b' }
  */
-const invert = createInverter((result, value, key) => {
-  result[value] = key;
-});
+function invert(object) {
+  const result = {};
+  baseForOwn(object, (value, key) => {
+    result[value] = key;
+  });
+  return result;
+}
 
 export default invert;

invertBy.js

@@ -1,4 +1,4 @@
-import createInverter from './.internal/createInverter.js';
+import baseForOwn from './baseForOwn.js';
 
 /** Used to check objects for own properties. */
 const hasOwnProperty = Object.prototype.hasOwnProperty;
@@ -22,12 +22,17 @@ const hasOwnProperty = Object.prototype.hasOwnProperty;
  * invertBy(object, value => `group${ value }`);
  * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
  */
-const invertBy = createInverter((result, value, key) => {
-  if (hasOwnProperty.call(result, value)) {
-    result[value].push(key);
-  } else {
-    result[value] = [key];
-  }
-});
+function invertBy(object, iteratee) {
+  const result = {};
+  baseForOwn(object, (value, key) => {
+    value = iteratee(value);
+    if (hasOwnProperty.call(result, value)) {
+      result[value].push(key);
+    } else {
+      result[value] = [key];
+    }
+  });
+  return result;
+}
 
 export default invertBy;