/**
 * Copyright 2019 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 { Observable , Transform } from "../types.js" ; typeparam param notifier returns export function buffer < T > ( notifier ) { let buffer = [ ] ; return new TransformStream < T , T [ ] > ( { start ( controller ) { ( async ( ) => { const reader = notifier . getReader ( ) ; while ( true ) { const { done } = await reader . read ( ) ; if ( buffer . length > 0 ) { controller . enqueue ( buffer ) ; buffer = [ ] ; } if ( done ) { controller . terminate ( ) ; return ; } } } ) ( ) ; } , transform ( chunk ) { buffer . push ( chunk ) ; } } , { highWaterMark : 1 } , { highWaterMark : 0 } ) ; }