function mergeMapimport { mergeMap } from "https://deno.land/x/rxjs@v1.0.2/mod.ts"; mergeMap<T, O extends ObservableInput<any>>(project: (value: T, index: number) => O, concurrent?: number): OperatorFunction<T, ObservedValueOf<O>>DeprecatedThe resultSelector parameter will be removed in v8. Use an inner map instead. Details: https://rxjs.dev/deprecations/resultSelector mergeMap<T, O extends ObservableInput<any>>(project: (value: T, index: number) => O,resultSelector: undefined,concurrent?: number,): OperatorFunction<T, ObservedValueOf<O>>DeprecatedThe resultSelector parameter will be removed in v8. Use an inner map instead. Details: https://rxjs.dev/deprecations/resultSelector mergeMap<T, R, O extends ObservableInput<any>>(project: (value: T, index: number) => O,resultSelector: (outerValue: T,innerValue: ObservedValueOf<O>,outerIndex: number,innerIndex: number,) => R,concurrent?: number,): OperatorFunction<T, R>Type ParametersTO extends ObservableInput<any>Parametersproject: (value: T, index: number) => Ooptionalconcurrent: numberReturnsOperatorFunction<T, ObservedValueOf<O>>Type ParametersTO extends ObservableInput<any>Parametersproject: (value: T, index: number) => OresultSelector: undefinedoptionalconcurrent: numberReturnsOperatorFunction<T, ObservedValueOf<O>>Type ParametersTRO extends ObservableInput<any>Parametersproject: (value: T, index: number) => OresultSelector: (outerValue: T,innerValue: ObservedValueOf<O>,outerIndex: number,innerIndex: number,) => Roptionalconcurrent: numberReturnsOperatorFunction<T, R>