hopefully fix #226

src/js/polyfills.js

@@ -1,63 +1,86 @@
 /* eslint-disable */
 
+// Array.findIndex Polyfill
+Array.prototype.findIndex =
+    Array.prototype.findIndex ||
+    function(callback) {
+        if (this === null) {
+            throw new TypeError('Array.prototype.findIndex called on null or undefined');
+        } else if (typeof callback !== 'function') {
+            throw new TypeError('callback must be a function');
+        }
+        var list = Object(this);
+        // Makes sures is always has an positive integer as length.
+        var length = list.length >>> 0;
+        var thisArg = arguments[1];
+        for (var i = 0; i < length; i++) {
+            if (callback.call(thisArg, list[i], i, list)) {
+                return i;
+            }
+        }
+        return -1;
+    };
+
 // Array.find Polyfill for IE<12.
 // Requested here: https://github.com/codeofsumit/leaflet.pm/issues/173
-Array.prototype.find = Array.prototype.find || function(callback) {
-  if (this === null) {
-    throw new TypeError('Array.prototype.find called on null or undefined');
-  } else if (typeof callback !== 'function') {
-    throw new TypeError('callback must be a function');
-  }
-  var list = Object(this);
-  // Makes sures is always has an positive integer as length.
-  var length = list.length >>> 0;
-  var thisArg = arguments[1];
-  for (var i = 0; i < length; i++) {
-    var element = list[i];
-    if ( callback.call(thisArg, element, i, list) ) {
-      return element;
-    }
-  }
-};
+Array.prototype.find =
+    Array.prototype.find ||
+    function(callback) {
+        if (this === null) {
+            throw new TypeError('Array.prototype.find called on null or undefined');
+        } else if (typeof callback !== 'function') {
+            throw new TypeError('callback must be a function');
+        }
+        var list = Object(this);
+        // Makes sures is always has an positive integer as length.
+        var length = list.length >>> 0;
+        var thisArg = arguments[1];
+        for (var i = 0; i < length; i++) {
+            var element = list[i];
+            if (callback.call(thisArg, element, i, list)) {
+                return element;
+            }
+        }
+    };
 
 // Polyfill for Object.assign()
 // https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Polyfill
 if (typeof Object.assign != 'function') {
-  Object.assign = function(target) {
-    'use strict';
-    if (target == null) {
-      throw new TypeError('Cannot convert undefined or null to object');
-    }
+    Object.assign = function(target) {
+        'use strict';
+        if (target == null) {
+            throw new TypeError('Cannot convert undefined or null to object');
+        }
 
-    target = Object(target);
-    for (var index = 1; index < arguments.length; index++) {
-      var source = arguments[index];
-      if (source != null) {
-        for (var key in source) {
-          if (Object.prototype.hasOwnProperty.call(source, key)) {
-            target[key] = source[key];
-          }
+        target = Object(target);
+        for (var index = 1; index < arguments.length; index++) {
+            var source = arguments[index];
+            if (source != null) {
+                for (var key in source) {
+                    if (Object.prototype.hasOwnProperty.call(source, key)) {
+                        target[key] = source[key];
+                    }
+                }
+            }
         }
-      }
-    }
-    return target;
-  };
+        return target;
+    };
 }
 
 // Polyfill for Element.remove()
 // https://developer.mozilla.org/de/docs/Web/API/ChildNode/remove#Polyfill
-(function (arr) {
-  arr.forEach(function (item) {
-    if (item.hasOwnProperty('remove')) {
-      return;
-    }
-    Object.defineProperty(item, 'remove', {
-      configurable: true,
-      enumerable: true,
-      writable: true,
-      value: function remove() {
-        this.parentNode.removeChild(this);
-      }
+(function(arr) {
+    arr.forEach(function(item) {
+        if (item.hasOwnProperty('remove')) {
+            return;
+        }
+        Object.defineProperty(item, 'remove', {
+            configurable: true,
+            enumerable: true,
+            writable: true,
+            value: function remove() {
+                this.parentNode.removeChild(this);
+            }
+        });
     });
-  });
 })([Element.prototype, CharacterData.prototype, DocumentType.prototype]);