Contents of some `.min.js` files are no longer minified

[desrosj]

The contents of 4 files are no longer minified despite that being the case in 6.9:

• wp-polyfill-node-contains.min.js
• wp-polyfill-dom-rect.min.js
• regenerator-runtime.min.js
• wp-polyfill-fetch.min.js

Follow up to #64393.

The tools/vendor/copy-vendors.js file was added in r61438 to copy files from the node_modules directory the appropriate location in built WordPress. This was previously handled by Webpack, but the majority of the Webpack code was also removed as part of that change.

In Grunt, there is a grunt copy task that is used to handle copying of files, and there is even a copy:vendor-js subtask. This moves all of the vendor file paths into this task to keep all vendor copying logic in one place.

Trac ticket: Core-65007. See also: Core-64393.

## Use of AI Tools

AI assistance: Yes
Tool(s): Claude
Model(s): Sonnet 4.6
Used for: Created the initial first draft of the PR.

[ozgursar]

Before applying patch 11418

[ozgursar]

After applying patch 11418

[ozgursar]

Patch Testing Report

Patch Tested: ​https://github.com/WordPress/wordpress-develop/pull/11418

Environment

• WordPress: 7.1-alpha-20260407.182057
• PHP: 8.3.30
• Server: PHP.wasm
• Database: WP_SQLite_Driver (Server: 8.0.38 / Client: 3.51.0)
• Browser: Opera
• OS: macOS
• Theme: Twenty Twenty-Five 1.4
• MU Plugins: None activated
• Plugins:
  • Test Reports 1.2.1

Steps taken

1. Run npm run build in your WordPress Develop folder cloned from the GitHub repo ​https://github.com/WordPress/wordpress-develop.
2. Observe the following files in wp-includes/js/dist/vendor/ that they are not minified.

• wp-polyfill-node-contains.min.js
• wp-polyfill-dom-rect.min.js
• regenerator-runtime.min.js
• wp-polyfill-fetch.min.js

3. Apply the patch.
4. Rerun npm run build.
5. Observe the files again and confirm that they are the minified versions.
6. ✅ Patch is solving the problem.

Expected result

• We expect to see the minified versions of the .min.js files in the wp-includes/js/dist/vendor/ folder.

Screenshots/Screencast with results

Before

After

[peterwilsoncc]

In 62258:

Build/Test Tools: Consolidate vendor file copying to ensure .min.js files are minified.

Relocates the copying of vendor JavaScript files back to the grunt copy:vendor-js subtask to ensure the files are in place prior to the grunt uglify step running to minify the files.

Props desrosj.
Fixes #65007.
See #64393.

[peterwilsoncc]

Reopening for merge to the 7.0 branch pending another committers sign-off.

[desrosj]

In 62276:

Build/Test Tools: Consolidate vendor file copying to ensure .min.js files are minified.

Relocates the copying of vendor JavaScript files back to the grunt copy:vendor-js subtask to ensure the files are in place prior to the grunt uglify step running to minify the files.

Reviewed by desrosj, peterwilsoncc.
Merges [62258] to the 7.0 branch.

Props desrosj, peterwilsoncc.
Fixes #65007.
See #64393.