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import { Observable } from '../Observable'; import { ObservableInput, OperatorFunction } from '../types'; import { identity } from '../util/identity'; import { mapOneOrManyArgs } from '../util/mapOneOrManyArgs'; import { pipe } from '../util/pipe'; import { mergeMap } from './mergeMap'; import { toArray } from './toArray'; /** * Collects all of the inner sources from source observable. Then, once the * source completes, joins the values using the given static. * * This is used for {@link combineLatestAll} and {@link zipAll} which both have the * same behavior of collecting all inner observables, then operating on them. * * @param joinFn The type of static join to apply to the sources collected * @param project The projection function to apply to the values, if any */ export function joinAllInternals<T, R>(joinFn: (sources: ObservableInput<T>[]) => Observable<T>, project?: (...args: any[]) => R) { return pipe( // Collect all inner sources into an array, and emit them when the // source completes. toArray() as OperatorFunction<ObservableInput<T>, ObservableInput<T>[]>, // Run the join function on the collected array of inner sources. mergeMap((sources) => joinFn(sources)), // If a projection function was supplied, apply it to each result. project ? mapOneOrManyArgs(project) : (identity as any) ); }
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