medium-rxjs-collection-pipe.ts

import { Observable, OperatorFunction } from "rxjs";

/* ... */

interface Collection {
  traverse(): Observable<Document>;
  traverse<A>(
    op1: OperatorFunction<Document, A>): Observable<A>;
  traverse<A, B>(
    op1: OperatorFunction<Document, A>,
    op2: OperatorFunction<A, B>): Observable<B>;
  traverse<A, B, C>(
    op1: OperatorFunction<Document, A>,
    op2: OperatorFunction<A, B>,
    op3: OperatorFunction<B, C>): Observable<C>;
  /* ... 5 signatures elided ... */
  traverse<A, B, C, D, E, F, G, H, I>(
    op1: OperatorFunction<Document, A>,
    op2: OperatorFunction<A, B>,
    op3: OperatorFunction<B, C>,
    op4: OperatorFunction<C, D>,
    op5: OperatorFunction<D, E>,
    op6: OperatorFunction<E, F>,
    op7: OperatorFunction<F, G>,
    op8: OperatorFunction<G, H>,
    op9: OperatorFunction<H, I>): Observable<I>;
}