Enable logical assignment by default in @babel/parser

[JLHwung]

Feature Request

Logical Assignment (&&=, ||=, ??=) is Stage 4!

This means that it should be enabled by default in @babel/parser 🎉

It should be done similarly to this commit: c3388ea

1. Remove all the this.hasPlugin and this.expectPlugin checks related to logicalAssignment in packages/babel-parser/src
2. Remove all the usages of logicalAssignment in @babel/parser's tests
3. Probably there is a test to ensure that the plugin is required; it can be removed.
4. Move the tests from the experimental folder to es2021, create one if it doesn't exist
5. PR! 🎉

---

If it is the first time that you contribute to Babel, follow these steps: (you need to have make and yarn available on your machine)

1. Write a comment there to let other possible contributors know that you are working on this bug.
2. Fork the repo
3. Run git clone https://github.com/<YOUR_USERNAME>/babel.git && cd babel
4. Run yarn && make bootstrap
5. Wait ⏳
6. Run make watch (or make build whenever you change a file)
7. Add a test if needed (only input.js; output.js will be automatically generated)
8. Update the code!
9. yarn jest babel-parser to run the tests
   • If some test outputs don't match but the new results are correct, you can delete the bad output.js files and run the tests again
   • If you prefer, you can run OVERWRITE=true yarn jest babel-parser and they will be automatically updated.
10. If it is working, run yarn jest to run all the tests
11. Run git push and open a PR!

[babel-bot]

Hey @JLHwung! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack community that typically always has someone willing to help. You can sign-up here for an invite."

[pustovalov]

I would like to give it a try

[JLHwung]

@pustovalov Thanks for showing up. A good first issue targets to first-time contributors. That said, if it is not claimed by a new contributor in the next 24 hours, it will be yours!

[vahnag]

I would like to take this. Will have it ready within 24 hours if that works.

[JLHwung]

@vahnag It's yours!

[existentialism]

@vahnag no rush!