v16 planned changes

[aladdin-add]

Starting a list of my desired breaking changes, feedback welcome. We can perform this release once we have compiled enough changes. We should watch out for any breaking changes needed for ESLint v9 in the coming months.

Planned:

• Drop node < 16
• recommended changes
  • default node.js version: ">=16"
  • ecmaVersion: "latest"
  • rules changes: TODO
• support the new eslint config: eslint.config.js: feat: support the new eslint config. #89

Maybe:

• Convert package to ESM or TypeScript?

[jordanbtucker]

What's the rationale to setting ecmaVersion to 'latest'? It would seem like you would want to default this to the version compatible with the default version of Node.js.

[Lalem001]

Regarding ecmaVersion I would argue that it should be set dynamically based on the targeted node version. For example:

ecmaVersion	nodeVersion (100%*)	nodeVersion (>95%*)	nodeVersion (>90%*)
2019	>= 12.4.0	>= 12.4.0	>= 12.4.0
2020	>= 16.4.0	>= 16.1.0	>= 14.0.0
2021	>= 16.4.0	>= 16.1.0	>= 15.0.0
2022		>= 16.11.0	>= 16.11.0
2023		>= 18.0.0	>= 18.0.0

* indicates the % coverage of ecmaScript per node.green

As far as which coverage level of ecmaScript to go with, I guess that could be up for debate. Maybe a strict/loose scenario?

[privatenumber]

I'm interested in tackling TypeScript conversion but it shouldn't be a breaking change if it's precompiled to CJS.

Would you be open to a pull request?

[voxpelli]

I would personally prefer typing up the existing code rather than converting it to TypeScript.

TypeScript works just as well on type annotated JS code as it does on TS code gut the latter requires a new compilation step?

[privatenumber]

Types would be nice but the bigger benefit for me is ESM. The export style in this codebase was a little difficult to read so updating those would be a huge improvement.

Compilation step would be necessary but can be seamless and instantaneous using esbuild.

[piranna]

Any update on this? There are some PRs like #87 pending to this. Also Node.js 14 will get EOL in one month, we should remove support for it too.