Fix mime-db trimming after switching to pnpm

[absidue]

Pull Request Type

• Bugfix

Related issue

• Add custom webpack loader to remove unused mimetypes from mime-db #5148
• Shrink mime-db even further #6659

Description

The webpack loader to remove all of the unused mime types from mime-db used a hardcoded path into the node_modules directory. As pnpm uses a different layout in the node_modules directory, the webpack loader was no longer being run. This pull request replaces the webpack loader with a resolve alias that points to a small hardcoded JSON file (mime-db is one really big JSON file) with the required mime types and extensions.

Screenshots

Before:

$ pnpm run pack
$ du -h dist/main.js
268K    dist/main.js

After:

$ pnpm run pack
$ du -h dist/main.js
124K    dist/main.js

Testing

1. Right click on an image
2. Click "save image as"
3. Check that the save picker shows the correct file extension.

Desktop

• OS: Windows
• OS Version: 11