Remove redundant .js extension from imports

config/karma.config.js

@@ -5,7 +5,7 @@ const argumentsParser = require('commander');
 const glob = require('glob');
 const webpack = require('webpack');
 const IS_EE = require('./helpers/is_ee_env');
-const webpackConfig = require('./webpack.config.js');
+const webpackConfig = require('./webpack.config');
 
 const ROOT_PATH = path.resolve(__dirname, '..');
 const SPECS_PATH = /^(?:\.[\\/])?(ee[\\/])?spec[\\/]javascripts[\\/]/;

config/webpack.config.js

@@ -422,7 +422,7 @@ module.exports = {
             );
 
             // eslint-disable-next-line global-require
-            const dllConfig = require('./webpack.vendor.config.js');
+            const dllConfig = require('./webpack.vendor.config');
             const dllCompiler = webpack(dllConfig);
 
             dllCompiler.run((err, stats) => {

scripts/frontend/extract_gettext_all.js

@@ -6,7 +6,7 @@ const {
   decorateExtractorWithHelpers,
 } = require('gettext-extractor-vue');
 const vue2TemplateCompiler = require('vue-template-compiler');
-const ensureSingleLine = require('../../app/assets/javascripts/locale/ensure_single_line.js');
+const ensureSingleLine = require('../../app/assets/javascripts/locale/ensure_single_line');
 
 const args = argumentsParser
   .option('-f, --file <file>', 'Extract message from one single file')

scripts/frontend/stylelint/stylelint-utility-classes.js

 const stylelint = require('stylelint');
 const utils = require('./stylelint-utils');
-const utilityClasses = require('./utility-classes-map.js');
+const utilityClasses = require('./utility-classes-map');
 
 const ruleName = 'stylelint-gitlab/utility-classes';
 

spec/javascripts/lib/utils/mock_data.js

-export * from '../../../frontend/lib/utils/mock_data.js';
+export * from '../../../frontend/lib/utils/mock_data';

storybook/config/webpack.config.js

@@ -5,7 +5,7 @@ const path = require('path');
 const sass = require('node-sass'); // eslint-disable-line import/no-unresolved
 const { buildIncludePaths, resolveGlobUrl } = require('node-sass-magic-importer/dist/toolbox'); // eslint-disable-line import/no-unresolved
 const webpack = require('webpack');
-const gitlabWebpackConfig = require('../../config/webpack.config.js');
+const gitlabWebpackConfig = require('../../config/webpack.config');
 
 const ROOT = path.resolve(__dirname, '../../');
 const TRANSPARENT_1X1_PNG =