Ask HN: Can you suggest some good JavaScript projects to read and learn?

I was about to suggest lodash.

It's not a project, but Airbnb have updated their Javascript style guide to ES6. It's a good read on how to write and structure javascript.

https://github.com/airbnb/javascript

The original jquery source w/ annotations: http://genius.it/5088474/ejohn.org/files/jquery-original.htm...

I'm also interested to see a mid-size scale SPA project that has excellent unit-testing and integration-testing.

I've read a lot about how JS can make programmer productive, I've also read a lot how code can be succinct and all that jazz because of JS, but I have _never seen_ a well-architected, well-documented, well-automated-tested non-todomvc SPA codebase.

This isn't a sarcasm or criticism but a serious and legitimate "ASK" because I'm working on a large-scale SPA project that's hard to write automation test other than Selenium.

I'm looking for something that can taught me:

1. Unit-testing (with some level of mocking)

2. Integration-testing (testing various components without hitting the UI but all the way up to the sending request, kind of like driving the front-end code without the UI).

3. Best practices/patterns for architecting large-scale SPA (hint: generic EventBus tend to be abused).

We have a mid-size scale SPA and its suffering because of bloat. Functions are 2-500 lines long as an example. we've had critical bugs in the last 2 weeks and I got fed up and decided to start learning unit testing. Its been absolutely painful to get everything setup and started (Visual Studio). Nothing works. I would love to see a well written project to base my tests off of.

I would really love to see a well written SPA with testing, but I fear its almost reaching unicorn status. Most projects suffer from deadlines so they'll just never be written the way they should be and instead, the flow is now: patch it and move on.