woocommerce/plugins/woocommerce-admin/client/utils/enqueue-script.js

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/**
* Adds a script to the page if it has not already been loaded. JS version of `wp_enqueue_script`.
*
* @param {Object} script WP_Script
* @param {string} script.handle Script handle.
* @param {string} script.src Script URL.
*/
export function enqueueScript( script ) {
return new Promise( ( resolve, reject ) => {
if ( document.querySelector( `#${ script.handle }-js` ) ) {
resolve();
}
const domElement = document.createElement( 'script' );
domElement.src = script.src;
domElement.id = `${ script.handle }-js`;
domElement.async = true;
domElement.onload = resolve;
domElement.onerror = reject;
document.body.appendChild( domElement );
} );
}