initial commit: scaffolding

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diff --git a/node_modules/rxjs/src/internal/operators/mergeMapTo.ts b/node_modules/rxjs/src/internal/operators/mergeMapTo.ts
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+import { OperatorFunction, ObservedValueOf, ObservableInput } from '../types';
+import { mergeMap } from './mergeMap';
+import { isFunction } from '../util/isFunction';
+
+/** @deprecated Will be removed in v9. Use {@link mergeMap} instead: `mergeMap(() => result)` */
+export function mergeMapTo<O extends ObservableInput<unknown>>(
+  innerObservable: O,
+  concurrent?: number
+): OperatorFunction<unknown, ObservedValueOf<O>>;
+/**
+ * @deprecated The `resultSelector` parameter will be removed in v8. Use an inner `map` instead.
+ * Details: https://rxjs.dev/deprecations/resultSelector
+ */
+export function mergeMapTo<T, R, O extends ObservableInput<unknown>>(
+  innerObservable: O,
+  resultSelector: (outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R,
+  concurrent?: number
+): OperatorFunction<T, R>;
+/* tslint:enable:max-line-length */
+
+/**
+ * Projects each source value to the same Observable which is merged multiple
+ * times in the output Observable.
+ *
+ * <span class="informal">It's like {@link mergeMap}, but maps each value always
+ * to the same inner Observable.</span>
+ *
+ * ![](mergeMapTo.png)
+ *
+ * Maps each source value to the given Observable `innerObservable` regardless
+ * of the source value, and then merges those resulting Observables into one
+ * single Observable, which is the output Observable.
+ *
+ * ## Example
+ *
+ * For each click event, start an interval Observable ticking every 1 second
+ *
+ * ```ts
+ * import { fromEvent, mergeMapTo, interval } from 'rxjs';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const result = clicks.pipe(mergeMapTo(interval(1000)));
+ *
+ * result.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link concatMapTo}
+ * @see {@link merge}
+ * @see {@link mergeAll}
+ * @see {@link mergeMap}
+ * @see {@link mergeScan}
+ * @see {@link switchMapTo}
+ *
+ * @param innerObservable An `ObservableInput` to replace each value from the
+ * source Observable.
+ * @param concurrent Maximum number of input Observables being subscribed to
+ * concurrently.
+ * @return A function that returns an Observable that emits items from the
+ * given `innerObservable`.
+ * @deprecated Will be removed in v9. Use {@link mergeMap} instead: `mergeMap(() => result)`
+ */
+export function mergeMapTo<T, R, O extends ObservableInput<unknown>>(
+  innerObservable: O,
+  resultSelector?: ((outerValue: T, innerValue: ObservedValueOf<O>, outerIndex: number, innerIndex: number) => R) | number,
+  concurrent: number = Infinity
+): OperatorFunction<T, ObservedValueOf<O> | R> {
+  if (isFunction(resultSelector)) {
+    return mergeMap(() => innerObservable, resultSelector, concurrent);
+  }
+  if (typeof resultSelector === 'number') {
+    concurrent = resultSelector;
+  }
+  return mergeMap(() => innerObservable, concurrent);
+}