/**
 * 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 } from "../types.js" ; typeparam param os returns export function combineLatest < T1 , T2 > ( o1 , o2 ) ; export function combineLatest < T1 , T2 , T3 > ( o1 , o2 , o3 ) ; export function combineLatest < T > ( ... os ) ; export function combineLatest < T > ( ... os ) { const NONE = Symbol ( ) ; const latestValue = os . map ( ( ) => NONE ) ; return new ReadableStream < T [ ] > ( { async start ( controller ) { const forwarders = os . map ( async ( o , idx ) => { const reader = o . getReader ( ) ; while ( true ) { const { value , done } = await reader . read ( ) ; if ( done ) { return ; } latestValue [ idx ] = value ! ; if ( ! latestValue . includes ( NONE ) ) { controller . enqueue ( [ ... ( latestValue as T [ ] ) ] ) ; } } } ) ; await Promise . all ( forwarders ) ; controller . close ( ) ; } } , { highWaterMark : 0 } ) ; }