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node_modules/webpack-chain/src/Module.js

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+const ChainedMap = require('./ChainedMap');
+const Rule = require('./Rule');
+
+module.exports = class extends ChainedMap {
+  constructor(parent) {
+    super(parent);
+    this.rules = new ChainedMap(this);
+    this.defaultRules = new ChainedMap(this);
+    this.extend(['noParse', 'strictExportPresence']);
+  }
+
+  defaultRule(name) {
+    return this.defaultRules.getOrCompute(
+      name,
+      () => new Rule(this, name, 'defaultRule'),
+    );
+  }
+
+  rule(name) {
+    return this.rules.getOrCompute(name, () => new Rule(this, name, 'rule'));
+  }
+
+  toConfig() {
+    return this.clean(
+      Object.assign(this.entries() || {}, {
+        defaultRules: this.defaultRules.values().map((r) => r.toConfig()),
+        rules: this.rules.values().map((r) => r.toConfig()),
+      }),
+    );
+  }
+
+  merge(obj, omit = []) {
+    if (!omit.includes('rule') && 'rule' in obj) {
+      Object.keys(obj.rule).forEach((name) =>
+        this.rule(name).merge(obj.rule[name]),
+      );
+    }
+
+    if (!omit.includes('defaultRule') && 'defaultRule' in obj) {
+      Object.keys(obj.defaultRule).forEach((name) =>
+        this.defaultRule(name).merge(obj.defaultRule[name]),
+      );
+    }
+
+    return super.merge(obj, ['rule', 'defaultRule']);
+  }
+};