/** * Loads a JavaScript file from the given URL and executes it. * * @param {string} url Address of the .js file to load * @param {function} callback Method to invoke when the script * has loaded and executed */ export const loadScript = (url: string, callback?: (error?: Error) => void) => { const script = document.createElement('script'); script.type = 'text/javascript'; script.async = false; script.defer = false; script.src = url; if (typeof callback === 'function') { // Success callback script.onload = (event: Event) => { if (event.type === 'load') { // Kill event listeners script.onload = script.onerror = null; callback(); } }; // Error callback script.onerror = (err: Event | string) => { // Kill event listeners script.onload = script.onerror = null; callback(new Error('Failed loading script: ' + script.src + '\n' + err)); }; } // Append the script at the end of const head = document.querySelector('head'); if (head) { head.insertBefore(script, head.lastChild); } };