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index.js
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index.js
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import {
isFunction,
isString,
} from '../ohjs-is/index.js';
let map = {};
/**
* A simple function to ensure an external script is loaded.
*
* @param {string} src - The src of the desired <script> tag.
* @param {function} verify - Used to verify if the script is fully loaded.
*
* @return {Promise} - Resolves when the script is loaded.
*/
export default function(src, verify) {
if (!src || !isString(src)) {
throw '`src` must be a non-empty string';
}
if (!isFunction(verify)) {
throw '`verify` must be a function';
}
if (!map.hasOwnProperty(src)) {
map[src] = false;
}
if (map[src]) {
return new Promise((resolve) => {
resolve();
});
}
if (!document.querySelector('script[src="' + src + '"]')) {
const script = document.createElement('script');
script.src = src;
let appendTo = document.getElementsByTagName('head')[0]
|| document.getElementsByTagName('body')[0];
appendTo.appendChild(script);
}
return new Promise((resolve) => {
let interval = setInterval(() => {
if (verify()) {
clearInterval(interval);
map[src] = true;
resolve();
}
}, 100);
});
}