@textback/notification-widget/src/sdk/utils/loadScript.js

TODO: Give a short introduction of your project. Let this section explain the objectives or the motivation behind this project.

const cache = {};

export default function loadScript(url) {
    if (cache[url]){
        return cache[url];
    }

    cache[url] = new Promise((resolve, reject) => {
        let ready = false;
        const scriptElement = document.createElement("script");

        scriptElement.type = "text/javascript";
        scriptElement.src = url;
        scriptElement.async = true;
        scriptElement.onload = scriptElement.onreadystatechange = function() {
            if (!ready && (!this.readyState || this.readyState == "complete")) {
                ready = true;
                resolve();
            }
        };
        scriptElement.onerror = scriptElement.onabort = reject;
        document.head.appendChild(scriptElement);
    });

    return cache[url];
}