🚀 Feature: Monorepo workspaces support

[daniel-nagy]

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

This plugin is not working when using bun or yarn workspaces and importing a module from another package in the workspace that contains declaration files. I originally created a bug ticket for typescript-eslint and they were able to rule out any issues on their end. I created a repo to reproduce the issue.

Additional Info

No response

[JoshuaKGoldberg]

👋 sorry for the slow response @daniel-nagy! Thanks for filing both issues & creating a standalone repro, that's really helpful. 🙂

As for this reproduction: very interesting. A few notes:

• Quick summary: this is purely using Yarn workspaces ("workspaces": ["packages/*"]), not any TSConfig paths or similar. b/package.json includes "dependencies": { "a": ... }.
• Removing EXPERIMENTAL_useProjectService does not fix the error or change anything
• The actual here is what includes const _copy: any:

  eslint-plugin-expect-type/src/rules/expect.ts

  Lines 648 to 659 in bf98512

  	const qi = languageService.getQuickInfoAtPosition(
  	sourceFile.fileName,
  	node.getStart(),
  	);
  	if (!qi?.displayParts) {
  	twoSlashFailureLines.push(
  	sourceFile.getLineAndCharacterOfPosition(position).line,
  	);
  	continue;
  	}
  	const actual = qi.displayParts.map((dp) => dp.text).join("");

...I'd guess this is an issue with the created TS language service:

eslint-plugin-expect-type/src/rules/expect.ts

Lines 92 to 94 in bf98512

	const languageService = ts.createLanguageService(
	getLanguageServiceHost(program),
	);

Accepting PRs!

[JoshuaKGoldberg]

@all-contributors please add @daniel-nagy for bug.

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[allcontributors]

@JoshuaKGoldberg

I've put up a pull request to add @daniel-nagy! 🎉

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