initial commit: scaffolding

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diff --git a/node_modules/rxjs/src/internal/operators/mapTo.ts b/node_modules/rxjs/src/internal/operators/mapTo.ts
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+import { OperatorFunction } from '../types';
+import { map } from './map';
+
+/** @deprecated To be removed in v9. Use {@link map} instead: `map(() => value)`. */
+export function mapTo<R>(value: R): OperatorFunction<unknown, R>;
+/**
+ * @deprecated Do not specify explicit type parameters. Signatures with type parameters
+ * that cannot be inferred will be removed in v8. `mapTo` itself will be removed in v9,
+ * use {@link map} instead: `map(() => value)`.
+ * */
+export function mapTo<T, R>(value: R): OperatorFunction<T, R>;
+
+/**
+ * Emits the given constant value on the output Observable every time the source
+ * Observable emits a value.
+ *
+ * <span class="informal">Like {@link map}, but it maps every source value to
+ * the same output value every time.</span>
+ *
+ * ![](mapTo.png)
+ *
+ * Takes a constant `value` as argument, and emits that whenever the source
+ * Observable emits a value. In other words, ignores the actual source value,
+ * and simply uses the emission moment to know when to emit the given `value`.
+ *
+ * ## Example
+ *
+ * Map every click to the string `'Hi'`
+ *
+ * ```ts
+ * import { fromEvent, mapTo } from 'rxjs';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const greetings = clicks.pipe(mapTo('Hi'));
+ *
+ * greetings.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link map}
+ *
+ * @param value The value to map each source value to.
+ * @return A function that returns an Observable that emits the given `value`
+ * every time the source Observable emits.
+ * @deprecated To be removed in v9. Use {@link map} instead: `map(() => value)`.
+ */
+export function mapTo<R>(value: R): OperatorFunction<unknown, R> {
+  return map(() => value);
+}