As of now, there are some available extensions: for example Minify or JS & CSS Minifier

Note: You can find extensions on the VS Code Marketplace.

Or directly from VS Code by searching from the Extensions pane, on the left side (Ctrl + Shift + X).

Are you setting your build up through vscode and not using something like webpack/parcel/gulp?

I can't suggest any plugins for you. There may be a limited selection, since this isn't really the proper way to do things, but you seem to realize this.

If you insist on doing this, and can't find a plugin which fits your needs, you can always use CTRL+F with the regular expression (?: |\n):

If you use tabs instead of spaces, then you should be able to replace them with \t.

The catch is that this will obviously replace spaces within your document, but since browsers automatically remove extra spaces, this hopefully shouldn't be an issue.

I would suggest looking into vite. It's a newer and faster alternative to webpack, and I personally find it a lot easier to use and understand.