glob - find .js files but not .min.js files

I am trying to write a glob pattern that matches .js files but not .min.js files. The string then gets passed to this method:

let watcher = workspace.createFileSystemWatcher(globPattern);

I have tried multiple patterns, but none of them are finding files.

'**/!(*.min).js'
'**/*.!(min).js'

What pattern can I use that finds just the .js files and not the .min.js files?

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