1 files changed, 56 insertions, 0 deletions
diff --git a/remote/test/puppeteer/packages/puppeteer-core/src/util/AsyncIterableUtil.ts b/remote/test/puppeteer/packages/puppeteer-core/src/util/AsyncIterableUtil.ts
new file mode 100644
index 0000000000..5b06b3ab30
--- /dev/null
+++ b/remote/test/puppeteer/packages/puppeteer-core/src/util/AsyncIterableUtil.ts
@@ -0,0 +1,56 @@
+/**
+ * Copyright 2023 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import {AwaitableIterable} from '../common/types.js';
+
+/**
+ * @internal
+ */
+export class AsyncIterableUtil {
+  static async *map<T, U>(
+    iterable: AwaitableIterable<T>,
+    map: (item: T) => Promise<U>
+  ): AsyncIterable<U> {
+    for await (const value of iterable) {
+      yield await map(value);
+    }
+  }
+
+  static async *flatMap<T, U>(
+    iterable: AwaitableIterable<T>,
+    map: (item: T) => AwaitableIterable<U>
+  ): AsyncIterable<U> {
+    for await (const value of iterable) {
+      yield* map(value);
+    }
+  }
+
+  static async collect<T>(iterable: AwaitableIterable<T>): Promise<T[]> {
+    const result = [];
+    for await (const value of iterable) {
+      result.push(value);
+    }
+    return result;
+  }
+
+  static async first<T>(
+    iterable: AwaitableIterable<T>
+  ): Promise<T | undefined> {
+    for await (const value of iterable) {
+      return value;
+    }
+    return;
+  }
+}