types: add export to package.json, test with strict mode and node16 resolution

[ChristianMurphy]

hold off on merging this for a bit, it may require a change to is-reference first

updates upstream PRs have been merged.

This PR

• adds type exports to package.json
• runs typescript in strict mode
• resolves modules in typescript in node16 (esm) mode
• moves @types/estree to dependencies for typescript users
• updates @types/estree to version 1.x
• test compatibility with acorn version 8

[ChristianMurphy]

opened Rich-Harris/is-reference#14 for is-reference update

[ChristianMurphy]

This may also require an update to estree-walker, WIP PR started here: Rich-Harris/estree-walker#34

[ChristianMurphy]

Upstream PRs have been merged.
Tests and type checks are passing.

This is ready for review when folks have a moment.
/cc @Rich-Harris @wooorm @remcohaszing

[ChristianMurphy]

@Rich-Harris friendly ping.
Anything I could do to help get this across the finish line?

[Rich-Harris]

done, thank you! released 3.1.0

[ChristianMurphy]

Thanks @Rich-Harris! 🙇

[ChristianMurphy]

@Rich-Harris quick question while this is top of mind, was this pushed to npmjs.com?
I'm checking

npm view periscopic

and it is still listing version 3.0.4 as the latest version

[ChristianMurphy]

I think something went wrong with the release, npm is still showing 3.0.4 as latest today, no 3.1.0 is appearing yet.

[Rich-Harris]

that's weird, could have sworn it went through. looks to be fixed now

[ChristianMurphy]

Thanks, I can see the new version now 🙇