feat: clone options before building

src/js/charts/BaseChart.js

@@ -6,9 +6,12 @@ import { BASE_MEASURES, getExtraHeight, getExtraWidth, getTopOffset, getLeftOffs
 import { getColor, isValidColor } from '../utils/colors';
 import { runSMILAnimation } from '../utils/animation';
 import { downloadFile, prepareForExport } from '../utils/export';
+import { deepClone } from  '../utils/helpers'
 
 export default class BaseChart {
 	constructor(parent, options) {
+		// deepclone options to avoid making changes to orignal object
+		options = deepClone(options)
 
 		this.parent = typeof parent === 'string'
 			? document.querySelector(parent)

src/js/utils/helpers.js

@@ -115,3 +115,29 @@ export function round(d) {
 	// https://www.jacklmoore.com/notes/rounding-in-javascript/
 	return Number(Math.round(d + 'e4') + 'e-4');
 }
+
+/**
+ * Creates a deep clone of an object
+ * @param {Object} candidate Any Object
+ */
+ export function deepClone(candidate) {
+	let cloned, value, key;
+  
+	if (candidate instanceof Date) {
+	  return new Date(candidate.getTime());
+	}
+  
+	if (typeof candidate !== "object" || candidate === null) {
+	  return candidate;
+	}
+  
+	cloned = Array.isArray(candidate) ? [] : {};
+  
+	for (key in candidate) {
+	  value = candidate[key];
+  
+	  cloned[key] = deepClone(value);
+	}
+  
+	return cloned;
+  }