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Diffstat (limited to '')
-rw-r--r-- | remote/test/puppeteer/packages/puppeteer-core/src/util/AsyncIterableUtil.ts | 56 |
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; + } +} |