[Pkg-javascript-devel] Bug#922824: Bug#922824: sourceMappingURL in minified js seems to point to the wrong location
Jonas Smedegaard
jonas at jones.dk
Thu Feb 21 10:05:00 GMT 2019
Hi Enrico,
Thanks for reporting this issue!
Quoting Enrico Zini (2019-02-21 09:31:42)
> The minified bootstrap4 javascript file is currently distributed in
> these two paths:
>
> /usr/lib/nodejs/bootstrap/dist/js/bootstrap.min.js
> /usr/share/javascript/bootstrap4/js/bootstrap.min.js
>
> and they come with a sourceMappingURL of:
>
> //# sourceMappingURL=dist/js/bootstrap.js.map
>
> If I make one of those paths accessible on the web and include bootstrap
> with something like:
>
> <script src="{{static_url('bootstrap4/js/bootstrap.min.js')}}"></script>
>
> Then I see the browser make this failed request on my HTTP server:
>
> 404 GET /static/bootstrap4/js/dist/js/bootstrap.js.map
>
> I tried to look up how sourceMappingURL works:
>
> https://stackoverflow.com/questions/38427991/which-is-the-base-url-of-sourcemappingurl-relative-from-html-or-js
>
> and it looks to me like bootstrap.min.js should contain something like
> "sourceMappingURL=bootstrap.js.map" to have it being found alongside the
> .min.js version.
My understanding is that the source-mapping should point to _source_
locations.
For simple cases, we provide source in node-* packages and minified code
in libjs-* packages, but not always: Nodejs code may be reorganized,
concatenated and/or transformed code as well.
I believe source-mapping files in Debian should follow same structure
across all Javascript packages in Debian, and that we therefore cannot
rely on mapping to Nodejs code (even if possibly it might be possible to
do for Bootstrap specifically).
My intend (untested, undocumented and uncoordinated with the Javascript
team - thanks for pulling it out of me now for the first time ever) for
these source-mapping files recently added to Bootstrap and 10-30 other
packages, is that the source-mapping files map to the files relative to
corresponding Debian source packages.
Using source-maps for browsing into sources requires somehow serving
those source files, and hinting e.g. with the "SourceMap" http header
where they are located.
I imagine it would be possible to setup a static Apache2 hint to point
to the sources served at https://sources.debian.org/
Does that make sense? If so, then I believe this "bug" is more lack of
documentation than the Boostrap package being wrong.
Thanks a lot for your interest in these details, and sorry this was not
already in a more polished state,
- Jonas
--
* Jonas Smedegaard - idealist & Internet-arkitekt
* Tlf.: +45 40843136 Website: http://dr.jones.dk/
[x] quote me freely [ ] ask before reusing [ ] keep private
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