From 06bc4a5c8738a68101b4cbe726f5e5cb8d10cd2d Mon Sep 17 00:00:00 2001
From: Yazan Alaboudi <yazan.alaboudi@gmail.com>
Date: Mon, 21 Oct 2019 19:25:49 +0400
Subject: [PATCH] refactor(mapTo): update function signature

Reduce the number of generics used in the 'mapTo' function to 1 generic parameter. Mark the 2 generic variant as a deprecated variant

Fixes ReactiveX/rxjs#5090
---
 src/internal/operators/mapTo.ts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/internal/operators/mapTo.ts b/src/internal/operators/mapTo.ts
index a072604d4d..2961f5d913 100644
--- a/src/internal/operators/mapTo.ts
+++ b/src/internal/operators/mapTo.ts
@@ -3,6 +3,10 @@ import { Subscriber } from '../Subscriber';
 import { Observable } from '../Observable';
 import { OperatorFunction } from '../types';
 
+export function mapTo<R>(value: R): OperatorFunction<any, R>;
+/** @deprecated remove in v8. Use mapTo<R>(value: R): OperatorFunction<any, R> signature instead **/
+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.
@@ -35,8 +39,8 @@ import { OperatorFunction } from '../types';
  * @method mapTo
  * @owner Observable
  */
-export function mapTo<T, R>(value: R): OperatorFunction<T, R> {
-  return (source: Observable<T>) => source.lift(new MapToOperator(value));
+export function mapTo<R>(value: R): OperatorFunction<any, R> {
+  return (source: Observable<any>) => source.lift(new MapToOperator(value));
 }
 
 class MapToOperator<T, R> implements Operator<T, R> {