Use object spread in lieu of object-assign

.babelrc

@@ -8,6 +8,7 @@
   ],
   "plugins": [
     "dynamic-import-webpack",
-    "transform-class-properties"
+    "transform-class-properties",
+    "transform-object-rest-spread"
   ]
 }

.eslintrc.js

@@ -12,10 +12,12 @@ module.exports = {
   'parser': 'babel-eslint',
   'plugins': [
     'standard',
-    'promise'
+    'promise',
+    'prefer-object-spread'
   ],
   'rules': {
-    'semi': ['error', 'always'],
-    'no-var': 'error'
+    'no-var': 'error',
+    'prefer-object-spread/prefer-object-spread': 2,
+    'semi': ['error', 'always']
   }
 };

package.json

@@ -17,13 +17,15 @@
     "babel-loader": "^7.1.2",
     "babel-plugin-dynamic-import-webpack": "^1.0.1",
     "babel-plugin-transform-class-properties": "^6.24.1",
+    "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "babel-preset-env": "^1.6.0",
     "css-loader": "^0.28.6",
     "debounce": "^1.0.2",
     "eslint": "^4.5.0",
     "eslint-config-standard": "^10.2.1",
     "eslint-plugin-import": "^2.7.0",
     "eslint-plugin-node": "^5.1.1",
+    "eslint-plugin-prefer-object-spread": "^1.2.1",
     "eslint-plugin-promise": "^3.5.0",
     "eslint-plugin-standard": "^3.0.1",
     "extract-text-webpack-plugin": "^3.0.0",
@@ -37,7 +39,6 @@
     "html-webpack-plugin": "^2.30.1",
     "htmllint-loader": "^1.3.8",
     "node-sass": "^4.5.3",
-    "object-assign": "^4.1.1",
     "postcss-loader": "^2.0.6",
     "sass-loader": "^6.0.6",
     "style-loader": "^0.18.2",

src/js/connector/polyline.js

@@ -1,5 +1,3 @@
-import objectAssign from 'object-assign'; // Object.assign is missing in e.g. IE11
-
 // TODO: just use ES6 class...
 const AnimatedPolyline = function (options) {
   options = options || {};
@@ -8,9 +6,9 @@ const AnimatedPolyline = function (options) {
     strokeStyle: '#f1dbce',
     lineWidth: 4,
     animated: true,
-    animateAmount: 4
+    animateAmount: 4,
+    ...options
   };
-  objectAssign(this.options, options);
 
   this.finished = false;
   this.segments = options.segments;