hunk.code_window:     "compile_dist_esm2015": "tsc -p ./tsconfig/tsconfig.esm2015.json",
       "compile_dist_esm2015_for_docs": "tsc ./dist/src/internal/Rx.ts ./dist/src/add/observable/of.ts ./dist/src/MiscJSDoc.ts -m es2015   --sourceMap --outDir ./dist/es6 --target es2015 -d --diagnostics --pretty --noImplicitAny --noImplicitReturns --noImplicitThis --suppressImplicitAnyIndexErrors --moduleResolution node",
       "compile_dist_esm5_for_rollup": "tsc -p ./tsconfig/tsconfig.esm5.rollup.json",
       "compile_legacy_reexport": "tsc -p ./tsconfig/tsconfig.legacy-reexport.json",
       "copy_sources": "mkdirp dist && shx cp -r ./src/ ./dist/src",
       "copy_for_tests": "shx rm -rf ./spec-build && shx cp -r ./spec/ ./spec-build/ && mkdir ./spec-build/node_modules && shx cp -r ./dist/package/ ./spec-build/node_modules/rxjs && shx cp -r ./dist-compat/package/ ./spec-build/node_modules/rxjs-compat",
       "decision_tree_widget": "cd doc/decision-tree-widget && npm run build && cd ../..",
       "doctoc": "doctoc CONTRIBUTING.md",
       "generate_packages": "node .make-packages.js",
  
hunk.labels: keep keep keep keep keep replace keep keep keep
hunk.after_edit:     "copy_for_tests": "shx rm -rf ./spec-build && shx cp -r ./spec/ ./spec-build/ && mkdirp ./spec-build/node_modules && shx cp -r ./dist/package/ ./spec-build/node_modules/rxjs && shx cp -r ./dist-compat/package/ ./spec-build/node_modules/rxjs-compat",
  
hunk.file_path: package.json
hunk.type: replace
file: import { Operator } from '../Operator';
  import { Observable } from '../Observable';
  import { Subscriber } from '../Subscriber';
  import { Subscription } from '../Subscription';
  import { OuterSubscriber } from '../OuterSubscriber';
  import { InnerSubscriber } from '../InnerSubscriber';
  import { subscribeToResult } from '../util/subscribeToResult';
  import { ObservableInput, OperatorFunction } from '../types';
  
  /**
   * Projects each source value to an Observable which is merged in the output
   * Observable only if the previous projected Observable has completed.
   *
   * <span class="informal">Maps each value to an Observable, then flattens all of
   * these inner Observables using {@link exhaust}.</span>
   *
   * <img src="./img/exhaustMap.png" width="100%">
   *
   * Returns an Observable that emits items based on applying a function that you
   * supply to each item emitted by the source Observable, where that function
   * returns an (so-called "inner") Observable. When it projects a source value to
   * an Observable, the output Observable begins emitting the items emitted by
   * that projected Observable. However, `exhaustMap` ignores every new projected
   * Observable if the previous projected Observable has not yet completed. Once
   * that one completes, it will accept and flatten the next projected Observable
   * and repeat this process.
   *
   * @example <caption>Run a finite timer for each click, only if there is no currently active timer</caption>
   * var clicks = Rx.Observable.fromEvent(document, 'click');
   * var result = clicks.exhaustMap((ev) => Rx.Observable.interval(1000).take(5));
   * result.subscribe(x => console.log(x));
   *
   * @see {@link concatMap}
   * @see {@link exhaust}
   * @see {@link mergeMap}
   * @see {@link switchMap}
   *
   * @param {function(value: T, ?index: number): ObservableInput} project A function
   * that, when applied to an item emitted by the source Observable, returns an
   * Observable.
   * @return {Observable} An Observable containing projected Observables
   * of each item of the source, ignoring projected Observables that start before
   * their preceding Observable has completed.
   * @method exhaustMap
   * @owner Observable
   */
  export function exhaustMap<T, R>(project: (value: T, index: number) => ObservableInput<R>): OperatorFunction<T, R> {
    return (source: Observable<T>) =>
      source.lift(new SwitchFirstMapOperator(project));
  }
  
  class SwitchFirstMapOperator<T, R> implements Operator<T, R> {
    constructor(private project: (value: T, index: number) => ObservableInput<R>) {
    }
  
    call(subscriber: Subscriber<R>, source: any): any {
      return source.subscribe(new SwitchFirstMapSubscriber(subscriber, this.project));
    }
  }
  
  /**
   * We need this JSDoc comment for affecting ESDoc.
   * @ignore
   * @extends {Ignored}
   */
  class SwitchFirstMapSubscriber<T, R> extends OuterSubscriber<T, R> {
    private hasSubscription = false;
    private hasCompleted = false;
    private index = 0;
  
    constructor(destination: Subscriber<R>,
                private project: (value: T, index: number) => ObservableInput<R>) {
      super(destination);
    }
  
    protected _next(value: T): void {
      if (!this.hasSubscription) {
        this.tryNext(value);
      }
    }
  
    private tryNext(value: T): void {
      const index = this.index++;
      const destination = this.destination;
      try {
        const result = this.project(value, index);
        this.hasSubscription = true;
        this.add(subscribeToResult(this, result, value, index));
      } catch (err) {
        destination.error(err);
      }
    }
  
    protected _complete(): void {
      this.hasCompleted = true;
      if (!this.hasSubscription) {
        this.destination.complete();
      }
    }
  
    notifyNext(outerValue: T, innerValue: R,
               outerIndex: number, innerIndex: number,
               innerSub: InnerSubscriber<T, R>): void {
      this.destination.next(innerValue);
    }
  
    notifyError(err: any): void {
      this.destination.error(err);
    }
  
    notifyComplete(innerSub: Subscription): void {
      this.remove(innerSub);
  
      this.hasSubscription = false;
      if (this.hasCompleted) {
        this.destination.complete();
      }
    }
  }
  