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node_modules/webpack-chain/src/Use.js

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+const merge = require('deepmerge');
+const ChainedMap = require('./ChainedMap');
+const Orderable = require('./Orderable');
+
+module.exports = Orderable(
+  class extends ChainedMap {
+    constructor(parent, name) {
+      super(parent);
+      this.name = name;
+      this.extend(['loader', 'options']);
+    }
+
+    tap(f) {
+      this.options(f(this.get('options')));
+      return this;
+    }
+
+    merge(obj, omit = []) {
+      if (!omit.includes('loader') && 'loader' in obj) {
+        this.loader(obj.loader);
+      }
+
+      if (!omit.includes('options') && 'options' in obj) {
+        this.options(merge(this.store.get('options') || {}, obj.options));
+      }
+
+      return super.merge(obj, [...omit, 'loader', 'options']);
+    }
+
+    toConfig() {
+      const config = this.clean(this.entries() || {});
+
+      Object.defineProperties(config, {
+        __useName: { value: this.name },
+        __ruleNames: { value: this.parent && this.parent.names },
+        __ruleTypes: { value: this.parent && this.parent.ruleTypes },
+      });
+
+      return config;
+    }
+  },
+);