Use ES6 in lib files.

lib/main/build-dist.js

@@ -1,17 +1,17 @@
 'use strict';
 
-var async = require('async'),
-    path = require('path');
+const async = require('async');
+const path = require('path');
 
-var file = require('../common/file'),
-    util = require('../common/util');
+const file = require('../common/file');
+const util = require('../common/util');
 
-var basePath = path.join(__dirname, '..', '..'),
-    distPath = path.join(basePath, 'dist'),
-    filename = 'lodash.js';
+const basePath = path.join(__dirname, '..', '..');
+const distPath = path.join(basePath, 'dist');
+const filename = 'lodash.js';
 
-var baseLodash = path.join(basePath, filename),
-    distLodash = path.join(distPath, filename);
+const baseLodash = path.join(basePath, filename);
+const distLodash = path.join(distPath, filename);
 
 /*----------------------------------------------------------------------------*/
 

lib/main/build-doc.js

@@ -1,20 +1,20 @@
 'use strict';
 
-var _ = require('lodash'),
-    docdown = require('docdown'),
-    fs = require('fs-extra'),
-    path = require('path');
+const _ = require('lodash');
+const docdown = require('docdown');
+const fs = require('fs-extra');
+const path = require('path');
 
-var util = require('../common/util');
+const util = require('../common/util');
 
-var basePath = path.join(__dirname, '..', '..'),
-    docPath = path.join(basePath, 'doc'),
-    readmePath = path.join(docPath, 'README.md');
+const basePath = path.join(__dirname, '..', '..');
+const docPath = path.join(basePath, 'doc');
+const readmePath = path.join(docPath, 'README.md');
 
-var pkg = require('../../package.json'),
-    version = pkg.version;
+const pkg = require('../../package.json');
+const version = pkg.version;
 
-var config = {
+const config = {
   'base': {
     'path': path.join(basePath, 'lodash.js'),
     'title': '<a href="https://lodash.com/">lodash</a> <span>v' + version + '</span>',
@@ -74,8 +74,8 @@ function postprocess(markdown) {
  * @param {string} type The format type.
  */
 function build(type) {
-  var options = _.defaults({}, config.base, config[type]),
-      markdown = docdown(options);
+  const options = _.defaults({}, config.base, config[type]);
+  const markdown = docdown(options);
 
   fs.writeFile(readmePath, postprocess(markdown), util.pitch);
 }

lib/main/build-modules.js

@@ -1,16 +1,16 @@
 'use strict';
 
-var _ = require('lodash'),
-    async = require('async'),
-    path = require('path');
+const _ = require('lodash');
+const async = require('async');
+const path = require('path');
 
-var file = require('../common/file'),
-    util = require('../common/util');
+const file = require('../common/file');
+const util = require('../common/util');
 
-var basePath = path.join(__dirname, '..', '..'),
-    distPath = path.join(basePath, 'dist');
+const basePath = path.join(__dirname, '..', '..');
+const distPath = path.join(basePath, 'dist');
 
-var filePairs = [
+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']
@@ -25,9 +25,8 @@ var filePairs = [
  * @param {string} target The output directory path.
  */
 function build(target) {
-  var actions = _.map(filePairs, function(pair) {
-    return file.copy(pair[0], path.join(target, pair[1]));
-  });
+  const actions = _.map(filePairs, pair =>
+    file.copy(pair[0], path.join(target, pair[1])));
 
   async.series(actions, util.pitch);
 }

lib/main/build-site.js

@@ -1,41 +1,41 @@
 'use strict';
 
-var _ = require('lodash'),
-    fs = require('fs'),
-    marky = require('marky-markdown'),
-    path = require('path'),
-    util = require('../common/util');
+const _ = require('lodash');
+const fs = require('fs');
+const marky = require('marky-markdown');
+const path = require('path');
+const util = require('../common/util');
 
-var basePath = path.join(__dirname, '..', '..'),
-    docPath = path.join(basePath, 'doc'),
-    readmePath = path.join(docPath, 'README.md');
+const basePath = path.join(__dirname, '..', '..');
+const docPath = path.join(basePath, 'doc');
+const readmePath = path.join(docPath, 'README.md');
+
+const highlights = [
+  'comment',
+  'constant',
+  'delimiter',
+  'html',
+  'js',
+  'method',
+  'modifier',
+  'numeric',
+  'shell',
+  'source',
+  'string',
+  'text',
+  'type'
+];
 
 function build(type) {
-  var markdown = fs
+  const markdown = fs
     // Load markdown.
     .readFileSync(readmePath, 'utf8')
     // Uncomment docdown HTML hints.
     .replace(/(<)!--\s*|\s*--(>)/g, '$1$2');
 
-  var $ = marky(markdown, { 'sanitize': false }),
-      $header = $('h1').first().remove(),
-      version = _.trim($header.find('span').first().text()).slice(1);
-
-  var highlights = [
-    'comment',
-    'constant',
-    'delimiter',
-    'html',
-    'js',
-    'method',
-    'modifier',
-    'numeric',
-    'shell',
-    'source',
-    'string',
-    'text',
-    'type'
-  ];
+  const $ = marky(markdown, { 'sanitize': false });
+  const $header = $('h1').first().remove();
+  const version = _.trim($header.find('span').first().text()).slice(1);
 
   // Remove docdown horizontal rules.
   $('hr').remove();
@@ -46,7 +46,7 @@ function build(type) {
     .attr('id', null);
 
   $(':header:not(h3) > a').each(function() {
-    var $a = $(this);
+    const $a = $(this);
     $a.replaceWith($a.html());
   });
 
@@ -54,8 +54,8 @@ function build(type) {
   $('p:empty + h3').prev().remove();
 
   $('h3 ~ p:empty').each(function() {
-    var $p = $(this),
-        node = this.previousSibling;
+    const $p = $(this);
+    let node = this.previousSibling;
 
     while ((node = node.previousSibling) && node.name != 'h3' && node.name != 'p') {
       $p.prepend(node.nextSibling);
@@ -63,19 +63,19 @@ function build(type) {
   });
 
   $('h3 code em').parent().each(function() {
-    var $code = $(this);
+    const $code = $(this);
     $code.html($code.html().replace(/<\/?em>/g, '_'));
   });
 
   // Cleanup highlights class names.
   $('.highlight [class]').each(function() {
-    var $el = $(this),
-        className = _.intersection($el.attr('class').split(/\s+/), highlights).join(' ');
+    const $el = $(this);
+    const className = _.intersection($el.attr('class').split(/\s+/), highlights).join(' ');
 
     $el.attr('class', className || null);
   });
 
-  var html = [
+  const html = [
     // Append YAML front matter.
     '---',
     'id: docs',