@webcomponents/webcomponentsjs/src/platform/parent-node/prepend.js

/**
@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 = (_b = 
// In Chrome 41, `firstChild` is a data descriptor on every instance, not a
// accessor descriptor on `Node.prototype`.
(_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);
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