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node_modules/webpack-chain/src/ResolveLoader.js

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+const Resolve = require('./Resolve');
+const ChainedSet = require('./ChainedSet');
+
+module.exports = class extends Resolve {
+  constructor(parent) {
+    super(parent);
+    this.moduleExtensions = new ChainedSet(this);
+    this.packageMains = new ChainedSet(this);
+  }
+
+  toConfig() {
+    return this.clean({
+      moduleExtensions: this.moduleExtensions.values(),
+      packageMains: this.packageMains.values(),
+      ...super.toConfig(),
+    });
+  }
+
+  merge(obj, omit = []) {
+    const omissions = ['moduleExtensions', 'packageMains'];
+
+    omissions.forEach((key) => {
+      if (!omit.includes(key) && key in obj) {
+        this[key].merge(obj[key]);
+      }
+    });
+
+    return super.merge(obj, [...omit, ...omissions]);
+  }
+};