ManifestStaticFilesStorage crashes on commented JavaScript import statements

[Adam Johnson]

#32319 added module support to ManifestStaticFilesStorage. It can crash with imports in comments, which are used for Typescript (​docs) but don't necessarily resolve when code is bundled.

Example ​from htmx:

//** @type {import("./htmx").HtmxApi} */

Leads to:

whitenoise.storage.MissingFileError: The file 'example/dist/htmx' could not be found with <whitenoise.storage.CompressedManifestStaticFilesStorage object at 0x16ff630a0>.

The JS file 'example/dist/app.js' references a file which could not be found:
  example/dist/htmx

Please check the URL references in this JS file, particularly any
relative paths which might be pointing to the wrong location.

The regex should be adjusted to only select imports that are alone on a line, with whitespace.

This may be a challenge as comments can be multi-line like:

        /**
         * @param {HTMLElement} elt
         * @returns {import("./htmx").HtmxTriggerSpecification[]}
         */

[Carlton Gibson]

Grrr. OK. Sigh. Thanks for the report Adam. (I didn't run it, but I'm going to trust you)

(Mariusz was right to be sceptical that this was going to be OK. . :)

Let's look at a fix here but:

I think we need to be prepared to say where we're not going to try more complex solutions.
(https://code.djangoproject.com/ticket/32319#comment:21)

[Adam Johnson]

Added more detail to description about possible failures