From 7b9ceb85fa4e19ade740faa2af2e00e62e16f7c9 Mon Sep 17 00:00:00 2001
From: Alan Agius <alan.agius4@gmail.com>
Date: Thu, 8 Feb 2018 21:22:37 +0100
Subject: [PATCH] refactor: use union type in `DateConstructor` (#21757)

* refactor: use union type in `DateConstructor`

Add support for union types in `DateConstructor`

This will add support for something like the below;
`
let date; string | number;
const date = new Date(x);
`

Closes: #21758

* fix: date constructor can't be passed `string | Date`, but takes either individually

Closes: #20900
---
 lib/lib.es5.d.ts         | 3 +--
 src/lib/es2015.core.d.ts | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/lib/lib.es5.d.ts b/lib/lib.es5.d.ts
index 3f495ed40a9..07ffe74c05f 100644
--- a/lib/lib.es5.d.ts
+++ b/lib/lib.es5.d.ts
@@ -792,8 +792,7 @@ interface Date {
 
 interface DateConstructor {
     new(): Date;
-    new(value: number): Date;
-    new(value: string): Date;
+    new(value: string | number): Date;
     new(year: number, month: number, date?: number, hours?: number, minutes?: number, seconds?: number, ms?: number): Date;
     (): string;
     readonly prototype: Date;
diff --git a/src/lib/es2015.core.d.ts b/src/lib/es2015.core.d.ts
index eef20591a84..68be040c29d 100644
--- a/src/lib/es2015.core.d.ts
+++ b/src/lib/es2015.core.d.ts
@@ -69,7 +69,7 @@ interface ArrayConstructor {
 }
 
 interface DateConstructor {
-    new (value: Date): Date;
+    new (value: number | string | Date): Date;
 }
 
 interface Function {