Grunt Less uses pub/ prefix for sourcemaps

[gwharton]

Summary

When using grunt to generate css, the associated sourcemaps use the prefix pub/ on all urls it generates. This forces the webserver config to employ a workaround to allow pub/ urls to continue to work, just for the sourcemaps. Sourcemaps should not use the pub/ prefix.

Examples

Deploy Vanilla 2.4.7-p1

cp Gruntfile.js.sample Gruntfile.js
php bin/magento deploy:mode:set development
grunt clean
grunt exec
grunt less
less pub/static/frontend/Magento/luma/en_US/css/styles-l.css.map

Observe the paths include pub/static

Browse to the frontend and inspect an element in the dev console.
Check the location of the less file obtained via the sourcemap

Although this will still work if your nginx config includes the following snippet

https://github.com/magento/magento2/blob/91cb4d46834b88bb8dc9f5b06279a63d9ad0963c/nginx.conf.sample#L98C1-L104C2

But isn't the use of /pub/ urls now unsupported?

Proposed solution

No response

Release note

less/css sourcemaps generated by grunt no longer use the /pub prefix for paths.

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @gwharton. Thank you for your report.
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[hostep]

Nice find, here's a fix: #38840

[m2-assistant]

Hi @engcom-Hotel. Thank you for working on this issue.
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[engcom-Hotel]

Hello @gwharton,

Thanks for the report and collaboration!

We have tried to reproduce the issue in the Magento 2.4-develop (latest development branch) and the issue is reproducible for us. Please refer to the below screenshot:

Hence confirming the issue.

Thanks