IE11 compatibility (#6872)

Author: kurkle

src/core/core.animations.js

@@ -42,6 +42,17 @@ function copyOptions(target, values) {
 	delete values.options;
 }
 
+function extensibleConfig(animations) {
+	const result = {};
+	Object.keys(animations).forEach(key => {
+		const value = animations[key];
+		if (!isObject(value)) {
+			result[key] = value;
+		}
+	});
+	return result;
+}
+
 export default class Animations {
 	constructor(chart, animations) {
 		this._chart = chart;
@@ -50,12 +61,17 @@ export default class Animations {
 	}
 
 	configure(animations) {
+		if (!isObject(animations)) {
+			return;
+		}
+
 		const animatedProps = this._properties;
-		const animDefaults = Object.fromEntries(Object.entries(animations).filter(({1: value}) => !isObject(value)));
+		const animDefaults = extensibleConfig(animations);
 
-		for (let [key, cfg] of Object.entries(animations)) {
+		Object.keys(animations).forEach(key => {
+			const cfg = animations[key];
 			if (!isObject(cfg)) {
-				continue;
+				return;
 			}
 			for (let prop of cfg.properties || [key]) {
 				// Can have only one config per animation.
@@ -66,7 +82,7 @@ export default class Animations {
 					animatedProps.set(prop, extend({}, animatedProps.get(prop), cfg));
 				}
 			}
-		}
+		});
 	}
 
 	/**

src/core/core.controller.js

@@ -68,7 +68,8 @@ function mergeScaleConfig(config, options) {
 	});
 
 	// apply scale defaults, if not overridden by dataset defaults
-	Object.values(scales).forEach(scale => {
+	Object.keys(scales).forEach(key => {
+		const scale = scales[key];
 		helpers.mergeIf(scale, scaleService.getScaleDefaults(scale.type));
 	});
 
@@ -139,9 +140,9 @@ function updateConfig(chart) {
 	chart.tooltip.initialize();
 }
 
-const KNOWN_POSITIONS = ['top', 'bottom', 'left', 'right', 'chartArea'];
+const KNOWN_POSITIONS = new Set(['top', 'bottom', 'left', 'right', 'chartArea']);
 function positionIsHorizontal(position, axis) {
-	return position === 'top' || position === 'bottom' || (!KNOWN_POSITIONS.includes(position) && axis === 'x');
+	return position === 'top' || position === 'bottom' || (!KNOWN_POSITIONS.has(position) && axis === 'x');
 }
 
 function compare2Level(l1, l2) {