nodejs
diff --git a/‎lib/internal/errors.js‎
Lines changed: 50 additions & 6 deletions b/‎lib/internal/errors.js‎
Lines changed: 50 additions & 6 deletions
@@ -12,6 +12,7 @@
 
 const kCode = Symbol('code');
 const messages = new Map();
+const codes = {};
 
 var green = '';
 var red = '';
@@ -194,6 +195,54 @@ function createErrDiff(actual, expected, operator) {
   return `${msg}${skipped ? skippedMsg : ''}\n${res}${other}${end}`;
 }
 
+function makeNodeErrorWithCode(Base, key) {
+  return class NodeError extends Base {
+    constructor(...args) {
+      super(message(key, args));
+    }
+
+    get name() {
+      return `${super.name} [${key}]`;
+    }
+
+    set name(value) {
+      defineProperty(this, 'name', {
+        configurable: true,
+        enumerable: true,
+        value,
+        writable: true
+      });
+    }
+
+    get code() {
+      return key;
+    }
+
+    set code(value) {
+      defineProperty(this, 'code', {
+        configurable: true,
+        enumerable: true,
+        value,
+        writable: true
+      });
+    }
+  };
+}
+
+// Utility function for registering the error codes. Only used here. Exported
+// *only* to allow for testing.
+function E(sym, val, def, ...otherClasses) {
+  messages.set(sym, val);
+  if (def === undefined) return;
+  def = makeNodeErrorWithCode(def, sym);
+  if (otherClasses.length !== 0) {
+    otherClasses.forEach((clazz) => {
+      def[clazz.name] = makeNodeErrorWithCode(clazz, sym);
+    });
+  }
+  codes[sym] = def;
+}
+
 class AssertionError extends Error {
   constructor(options) {
     if (typeof options !== 'object' || options === null) {
@@ -296,12 +345,6 @@ function message(key, args) {
   return String(fmt.apply(null, args));
 }
 
-// Utility function for registering the error codes. Only used here. Exported
-// *only* to allow for testing.
-function E(sym, val) {
-  messages.set(sym, typeof val === 'function' ? val : String(val));
-}
-
 /**
  * This used to be util._errnoException().
  *
@@ -412,6 +455,7 @@ module.exports = exports = {
   RangeError: makeNodeError(RangeError),
   URIError: makeNodeError(URIError),
   AssertionError,
+  codes,
   E // This is exported only to facilitate testing.
 };