/**
 * 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 { Transform } from "../types.js" ; export type ScanFunc < U , T > = ( acc : U , v : T ) => U ; typeparam typeparam param f param v0 returns export function scan < U , T > ( f , v0 ) { return new TransformStream < T , U > ( { transform ( chunk , controller ) { v0 = f ( v0 , chunk ) ; controller . enqueue ( v0 ) ; } } , { highWaterMark : 1 } , { highWaterMark : 0 } ) ; }