How to get .mjs files load correctly

[rabol]

Hi

in a project I use PDF.js, and the latest version uses .mjs, but in laravel valet I get this error:

Failed to load module script: Expected a JavaScript-or-Wasm module script but the server responded with a MIME type of "application/octet-stream". Strict MIME type checking is enforced for module scripts per HTML spec.Understand this error

the maintainer of PDF.js and other search results all point at the fact tha nginx is not configured to handle. mjs files, and I can confirm that the mime.types file does not have the .mjs extension included and even adding the .mjs extension to the mime.types file does not work.

What do I need to do to make it work ?

Thanks.

[drbyte]

In ValetDriver.php there's a serveStaticFile() method which, in the default driver, simply cleans and removes any Content-Type header (according to code comments, to avoid PHP quirks).

I'm guessing that you could probably look at the file extension and explicitly set the content-type header.

eg:

        header('Content-Type: text/html');
        header_remove('Content-Type');
+        if (str_ends_with($uri, '.mjs')) {
+            header('Content-Type: text/javascript');
+      }

And if that works, you could consider moving it into your own LocalValetDriver.php which you can drop into future projects, until such time as a clear update for nginx works (which it should, since if PHP is sending no mime header, then nginx should self-detect).

[rabol]

Thanks a lot for the suggestion.

I have done some extra search, and 'investigation' and as far as I can figure njs was associated with ES in around 2018, but for some reason, the mime.types file that is included with nginx still does not include the mjs exension which is whyloading a script as module can cause an error - especially when using Google Chrome.

My current fix is to update the nginx.conf to have this:

    types {
        application/javascript js mjs;
    }

just after the include mime.types;

I will however try your suggestion maybe as a local driver.

Thanks.