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/**
@license
Copyright (c) 2017 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
*/
'use strict';
/** @type {Promise<void>} */
let readyPromise = null;
/** @type {?function(?function())} */
let whenReady = window['HTMLImports'] && window['HTMLImports']['whenReady'] || null;
/** @type {function()} */
let resolveFn;
/**
* @param {?function()} callback
*/
export default function documentWait(callback) {
requestAnimationFrame(function() {
if (whenReady) {
whenReady(callback)
} else {
if (!readyPromise) {
readyPromise = new Promise((resolve) => {resolveFn = resolve});
if (document.readyState === 'complete') {
resolveFn();
} else {
document.addEventListener('readystatechange', () => {
if (document.readyState === 'complete') {
resolveFn();
}
});
}
}
readyPromise.then(function(){ callback && callback(); });
}
});
}
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