diff --git a/closure/goog/promise/resolver.js b/closure/goog/promise/resolver.js
index febf793fd4..939027532d 100644
--- a/closure/goog/promise/resolver.js
+++ b/closure/goog/promise/resolver.js
@@ -3,40 +3,37 @@
  * Copyright The Closure Library Authors.
  * SPDX-License-Identifier: Apache-2.0
  */
+goog.module('goog.promise.Resolver');
+goog.module.declareLegacyNamespace();
 
-goog.provide('goog.promise.Resolver');
-
-goog.requireType('goog.Promise');
-
-
+const GoogPromise = goog.requireType('goog.Promise');
+const Thenable = goog.requireType('goog.Thenable');
 
 /**
  * Resolver interface for promises. The resolver is a convenience interface that
  * bundles the promise and its associated resolve and reject functions together,
  * for cases where the resolver needs to be persisted internally.
- *
- * @interface
  * @template TYPE
+ * @interface
  */
-goog.promise.Resolver = function() {};
-
-
-/**
- * The promise that created this resolver.
- * @type {!goog.Promise<TYPE>}
- */
-goog.promise.Resolver.prototype.promise;
-
-
-/**
- * Resolves this resolver with the specified value.
- * @type {function((TYPE|goog.Promise<TYPE>|Thenable)=)}
- */
-goog.promise.Resolver.prototype.resolve;
-
-
-/**
- * Rejects this resolver with the specified reason.
- * @type {function(*=): void}
- */
-goog.promise.Resolver.prototype.reject;
+class Resolver {
+  constructor() {
+    /**
+     * The promise that created this resolver.
+     * @type {!GoogPromise<TYPE>}
+     */
+    this.promise;
+    /**
+     * Resolves this resolver with the specified value.
+     * @type {function((TYPE|GoogPromise<TYPE>|Promise<TYPE>|IThenable|Thenable)=)}
+     */
+    this.resolve;
+    /**
+     * Rejects this resolver with the specified reason.
+     * @type {function(*=): void}
+     */
+    this.reject;
+  }
+}
+
+exports = Resolver;