function expandimport { expand } from "https://deno.land/x/rxjs@v1.0.2/mod.ts"; expand<T, O extends ObservableInput<unknown>>(project: (value: T, index: number) => O,concurrent?: number,scheduler?: SchedulerLike,): OperatorFunction<T, ObservedValueOf<O>>DeprecatedThe scheduler parameter will be removed in v8. If you need to schedule the inner subscription, use subscribeOn within the projection function: expand((value) => fn(value).pipe(subscribeOn(scheduler))). Details: Details: https://rxjs.dev/deprecations/scheduler-argument expand<T, O extends ObservableInput<unknown>>(project: (value: T, index: number) => O,concurrent: number | undefined,scheduler: SchedulerLike,): OperatorFunction<T, ObservedValueOf<O>>Type ParametersTO extends ObservableInput<unknown>Parametersproject: (value: T, index: number) => Ooptionalconcurrent: numberoptionalscheduler: SchedulerLikeReturnsOperatorFunction<T, ObservedValueOf<O>>Type ParametersTO extends ObservableInput<unknown>Parametersproject: (value: T, index: number) => Oconcurrent: number | undefinedscheduler: SchedulerLikeReturnsOperatorFunction<T, ObservedValueOf<O>>