🚀 Feature: Allow specifying multiple TS versions (node_modules/typescript paths)

[JoshuaKGoldberg]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

Porting over from microsoft/DefinitelyTyped-tools#858: @definitelytyped/expect has the ability to receive a versionsToTest option. That option contains an array of TS versions with paths to the node_modules. The plugin then runs roughly:

for (const version of versionsToTest) {
  const ts = require(version.path) as TSModule;
  const program = getProgram(tsconfigPath, ts, version.versionName, parserServices.program);

Let's port that feature over to eslint-plugin-expect-type. I think it can exist roughly as-is. Maybe some bikeshedding on the option name?

Additional Info

Edit: This would support react-native-community/discussions-and-proposals#719 (comment) too.

Edit: ...and microsoft/DefinitelyTyped-tools#440

[jakebailey]

Related: microsoft/DefinitelyTyped-tools#848

I'm not sure how much I like to have an API that accepts a path to require, however, doing this opens the door to us moving the copies somewhere else which is pretty helpful.

[nateshmbhat]

any update on this ?

[JoshuaKGoldberg]

@nateshmbhat no, if there's an update you'll see it in this issue. I haven't had time to work on #123 this year yet. Since you're interested, feel free to send your own PR that builds on #123 to resolve the issue. 🙂