Watch pipeline is running without changes being applied, also feels slow

[alex-page]

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• [x] I’ve read and understood the Contributing guidelines and have done my best effort to follow them.
• [x] I’ve read and agree to the Code of Conduct.
• [x] I’ve searched for any related issues and avoided creating a duplicate issue.

What happened

Building main navigation, I noticed when changing module.js a few things happened.

• The sass -> css and js -> minified js pipelines do not run asynchronously
• The watch doesn't build the only changed file type it builds everything, e.g. changing module.js forces sass -> css to run
• Changing module.js doesn't work with watch, need to cancel and re run.

What I expected to happen

Watch should be fast and simple, its currently slow and buggy.

Steps to reproduce:

1. Go to module
2. Go into package directory with javascript
3. npm run watch
4. Make a change in the module.js file
5. Watch will run however the changed js will not be there.