1 files changed, 96 insertions, 0 deletions
diff --git a/node_modules/@webpack-contrib/config-loader/lib/extend.js b/node_modules/@webpack-contrib/config-loader/lib/extend.js
new file mode 100644
index 00000000..0854032a
--- /dev/null
+++ b/node_modules/@webpack-contrib/config-loader/lib/extend.js
@@ -0,0 +1,96 @@
+const path = require('path');
+
+const isPlainObj = require('is-plain-obj');
+const merge = require('merge-options').bind({ concatArrays: true });
+
+const load = require('./load');
+const resolve = require('./resolve');
+const pluginFilters = require('./filters/plugins');
+const ruleFilters = require('./filters/rules');
+
+const loadExtends = (extent, options) => {
+  let result;
+  /* istanbul ignore else */
+  if (path.isAbsolute(extent)) {
+    result = load({ allowMissing: true, configPath: extent });
+  } else {
+    // eslint-disable-next-line import/no-dynamic-require, global-require
+    result = { config: require(extent), configPath: extent };
+  }
+
+  // eslint-disable-next-line no-use-before-define
+  return resolve(result).then(({ config }) => mergeExtend(config, options));
+};
+
+const filterPlugins = (config, options = {}) => {
+  const filterName = options.plugins || 'default';
+  const filter = pluginFilters[filterName] || pluginFilters.default;
+
+  return filter(config);
+};
+
+const filterRules = (config, options = {}) => {
+  const filterName = options.rules || 'default';
+  const filter = ruleFilters[filterName] || ruleFilters.default;
+
+  return filter(config);
+};
+
+const filterModule = (config, options = {}) => {
+  const { module } = config;
+  /* istanbul ignore else */
+  if (module) {
+    module.rules = filterRules(config, options);
+  }
+
+  return module;
+};
+
+const filter = (config, options = {}) => {
+  /* eslint-disable no-param-reassign */
+  config.module = filterModule(config, options);
+  config.plugins = filterPlugins(config, options);
+
+  return config;
+};
+
+const mergeExtend = (config, options = {}) => {
+  let { extends: configExtends } = config;
+
+  if (configExtends) {
+    if (isPlainObj(configExtends)) {
+      // eslint-disable-next-line no-param-reassign
+      options = configExtends.filters;
+      configExtends = configExtends.configs;
+    }
+
+    configExtends = [].concat(configExtends);
+
+    const result = configExtends.reduceRight(
+      (prev, conf) =>
+        loadExtends(conf, options).then((extent) =>
+          prev.then((prevConfig) => filter(merge(extent, prevConfig), options))
+        ),
+      Promise.resolve(config)
+    );
+
+    return result;
+  }
+
+  return Promise.resolve(config);
+};
+
+module.exports = {
+  extend(config, options) {
+    const promises = [].concat(config).map((conf) =>
+      mergeExtend(conf, options).then((result) => {
+        delete result.extends;
+        return result;
+      })
+    );
+
+    return Promise.all(promises).then(
+      (results) => (results.length > 1 ? results : results[0])
+    );
+  },
+};