From 8aa696537bc77254bc0615b7dc9cda430e3c1b43 Mon Sep 17 00:00:00 2001
From: "Manu Mtz.-Almeida" <manu.mtza@gmail.com>
Date: Mon, 14 May 2018 17:31:17 +0200
Subject: [PATCH] fix(angular): Required<> is not available

---
 core/src/utils/overlays.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/core/src/utils/overlays.ts b/core/src/utils/overlays.ts
index 29fff9231b..d91f1d9745 100644
--- a/core/src/utils/overlays.ts
+++ b/core/src/utils/overlays.ts
@@ -3,7 +3,14 @@ import { Animation, AnimationBuilder, Config, Mode } from '../interface';
 
 let lastId = 1;
 
-export function createOverlay<T extends HTMLIonOverlayElement & Required<B>, B>
+/**
+ * Convert an interface where all the properties are optional to mandatory.
+ */
+export type Requires<K extends string> = {
+  [P in K]: any;
+};
+
+export function createOverlay<T extends HTMLIonOverlayElement & Requires<keyof B>, B>
 (element: T, opts: B): Promise<T> {
   // convert the passed in overlay options into props
   // that get passed down into the new overlay