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rOACCT/node_modules/react-styleguidist/lib/scripts/utils/mergeWebpackConfig.js
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mergeWebpackConfig.js
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			"use strict";

			exports.__esModule = true;
			exports.default = mergeWebpackConfig;

			var _webpackMerge = _interopRequireDefault(require("webpack-merge"));

			var _isFunction = _interopRequireDefault(require("lodash/isFunction"));

			var _omit = _interopRequireDefault(require("lodash/omit"));

			function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

			const IGNORE_SECTIONS = ['entry', 'externals', 'output', 'watch', 'stats', 'styleguidist'];
			const IGNORE_SECTIONS_ENV = {
			development: [],
			// For production builds, we'll ignore devtool settings to avoid
			// source mapping bloat.
			production: ['devtool']
			};
			const IGNORE_PLUGINS = ['CommonsChunkPlugins', 'MiniHtmlWebpackPlugin', 'HtmlWebpackPlugin', 'OccurrenceOrderPlugin', 'DedupePlugin', 'UglifyJsPlugin', 'TerserPlugin', 'HotModuleReplacementPlugin'];
			const merge = (0, _webpackMerge.default)({
			// Ignore user’s plugins to avoid duplicates and issues with our plugins
			customizeArray: _webpackMerge.default.unique('plugins', IGNORE_PLUGINS, plugin => plugin.constructor && plugin.constructor.name)
			});

			/**
			* Merge two Webpack configs.
			*
			* In the user config:
			* - Ignores given sections (options.ignore).
			* - Ignores plugins that shouldn’t be used twice or may cause issues.
			*
			* @param {object} baseConfig
			* @param {object\|Function} userConfig
			* @param {string} env
			* @return {object}
			*/
			function mergeWebpackConfig(baseConfig, userConfig, env = 'production') {
			const userConfigObject = (0, _isFunction.default)(userConfig) ? userConfig(env) : userConfig;
			const safeUserConfig = (0, _omit.default)(userConfigObject, IGNORE_SECTIONS.concat(IGNORE_SECTIONS_ENV[env]));
			return merge(baseConfig, safeUserConfig);
			}