{"ast":null,"code":"import { map } from './map';\nimport { from } from '../observable/from';\nimport { SimpleOuterSubscriber, SimpleInnerSubscriber, innerSubscribe } from '../innerSubscribe';\nexport function exhaustMap(project, resultSelector) {\n if (resultSelector) {\n return source => source.pipe(exhaustMap((a, i) => from(project(a, i)).pipe(map((b, ii) => resultSelector(a, b, i, ii)))));\n }\n return source => source.lift(new ExhaustMapOperator(project));\n}\nclass ExhaustMapOperator {\n constructor(project) {\n this.project = project;\n }\n call(subscriber, source) {\n return source.subscribe(new ExhaustMapSubscriber(subscriber, this.project));\n }\n}\nclass ExhaustMapSubscriber extends SimpleOuterSubscriber {\n constructor(destination, project) {\n super(destination);\n this.project = project;\n this.hasSubscription = false;\n this.hasCompleted = false;\n this.index = 0;\n }\n _next(value) {\n if (!this.hasSubscription) {\n this.tryNext(value);\n }\n }\n tryNext(value) {\n let 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from(project(a, i)).pipe(map((b, ii) => resultSelector(a, b, i, ii)))));\n }\n return (source) => source.lift(new ExhaustMapOperator(project));\n}\nclass ExhaustMapOperator {\n constructor(project) {\n this.project = project;\n }\n call(subscriber, source) {\n return source.subscribe(new ExhaustMapSubscriber(subscriber, this.project));\n }\n}\nclass ExhaustMapSubscriber extends SimpleOuterSubscriber {\n constructor(destination, project) {\n super(destination);\n this.project = project;\n this.hasSubscription = false;\n this.hasCompleted = false;\n this.index = 0;\n }\n _next(value) {\n if (!this.hasSubscription) {\n this.tryNext(value);\n }\n }\n tryNext(value) {\n let result;\n const index = this.index++;\n try {\n result = this.project(value, index);\n }\n catch (err) {\n this.destination.error(err);\n return;\n }\n this.hasSubscription = true;\n this._innerSub(result);\n }\n _innerSub(result) {\n const innerSubscriber = new SimpleInnerSubscriber(this);\n const destination = 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