@webcomponents/webcomponentsjs
Version:
Web Components Polyfills
42 lines • 1.76 kB
JavaScript
/**
@license
Copyright (c) 2020 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
var _a, _b;
const nativeInsertBefore = Node.prototype.insertBefore;
const nativeGetFirstChild =
// In Chrome 41, `firstChild` is a data descriptor on every instance, not a
// accessor descriptor on `Node.prototype`.
(_b = (_a = Object.getOwnPropertyDescriptor(Node.prototype, 'firstChild')) === null || _a === void 0 ? void 0 : _a.get) !== null && _b !== void 0 ? _b :
// In Safari 9, the `firstChild` descriptor's `get` and `set` are undefined.
function () {
return this.firstChild;
};
const installPrepend = (constructor) => {
const prototype = constructor.prototype;
if (prototype.hasOwnProperty('prepend')) {
return;
}
Object.defineProperty(prototype, 'prepend', {
configurable: true,
enumerable: true,
writable: true,
value: function prepend(...args) {
const firstChild = nativeGetFirstChild.call(this);
for (const arg of args) {
const newNode = typeof arg === 'string' ? document.createTextNode(arg) : arg;
nativeInsertBefore.call(this, newNode, firstChild);
}
},
});
};
installPrepend(Document);
installPrepend(DocumentFragment);
installPrepend(Element);
export {};
//# sourceMappingURL=prepend.js.map