fix(config): add object.entries polyfil

Author: mhartington

core/src/global/config.ts

@@ -1,10 +1,12 @@
+import { entries } from '../utils/helpers';
 
 export class Config {
 
   private m: Map<string, any>;
 
   constructor(configObj: {[key: string]: any}) {
-    this.m = new Map<string, any>(Object.entries(configObj));
+    this.m = new Map<string, any>(entries(configObj));
+
   }
 
   get(key: string, fallback?: any): any {

core/src/utils/helpers.ts

@@ -41,6 +41,15 @@ export function pointerCoord(ev: any): {x: number, y: number} {
 }
 export type Side = 'start' | 'end';
 
+export function entries(obj: {[s: string]: T}): [string, T][] {
+  const ownProps = Object.keys( obj );
+  let i = ownProps.length;
+  const resArray = new Array(i);
+  while (i--)
+    resArray[i] = [ownProps[i], obj[ownProps[i]]];
+  return resArray;
+}
+
 /**
  * @hidden
  * Given a side, return if it should be on the right