ES6 modules in extensions in Chrome version 61

Question

This is not the same question as ES6 Modules In Google Chrome Extension Development (unexpected token) as that is both outdated and already answered.

Google produced a n

Answer 1

It could be a bug with loading local files. I managed to create a workaround for that, but you will still get an error in the console and you can not use other import statements within due to origin issues I guess:

window.addEventListener('load', function () {
    function appendModule(code) {
        let url = URL.createObjectURL(new Blob([code], { type: 'text/javascript' })); // create url from code

        let script = document.createElement('script');
        script.type = 'module';
        script.src = url;
        document.head.appendChild(script);
    }

    let scripts = document.querySelectorAll('script');
    console.log(scripts);
    for (let script of scripts) {
        script.parentElement.removeChild(script);
        if (script.getAttribute('type') !== 'module') continue; // found normal script
        if (script.getAttribute('src') !== null) {
            // load a file
            var request = new XMLHttpRequest();
            request.open('GET', script.getAttribute('src') + '?_=' + Date.now(), true);
            request.onload = function () {
                if (this.status >= 200 && this.status < 400) {
                    // file loaded
                    appendModule(this.response);
                } else {
                    // error loading file
                    console.error('Not able to load module:', script.getAttribute('src'));
                }
            };
            request.onerror = function () {
                // error loading file
                console.error('Not able to load module:', script.getAttribute('src'));
            };
            request.send();
        }
    }
});

In short: You load the script content, create a Blob with correct type and load it from a ObjectURL.