/**
 * 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 o returns export async function extractLast < T > ( o ) { const reader = o . getReader ( ) ; let latestValue ; let hasLatestValue = false ; while ( true ) { const { value , done } = await reader . read ( ) ; if ( done ) { break ; } latestValue = value ! ; hasLatestValue = true ; } if ( ! hasLatestValue ) { throw new Error ( "Observable finished without emitting any items" ) ; } return latestValue ! ; }