Before You File a Proposal Please Confirm You Have Done The Following...

• I have searched for related issues and found none that match my proposal.
• I have searched the current rule list and found no rules that match my proposal.
• I have read the FAQ and my problem is not listed.

Relevant Package

typescript-estree

My proposal is suitable for this project

• I believe my proposal would be useful to the broader TypeScript community (meaning it is not a niche proposal).

Description

Right now, if you enable typed linting on an "out-of-project" file not listed in projectService.allowDefaultProject, you get this error:

  0:0  error  Parsing error: path/to/repo/eslint.config.mjs was not found by the project service. Consider either including it in the tsconfig.json or including it in allowDefaultProject

...but what if you tried to enable it in allowDefaultProject and just mistyped? E.g. typing *.js instead of *.mjs for your eslint.config.mjs?

It'd be nice if we gave an explicit "these are your patterns, none matched". Maybe...

  0:0  error  Parsing error: path/to/repo/eslint.config.mjs was not found by the project service. Consider either including it in the tsconfig.json or including it in allowDefaultProject.
  allowDefaultProject is set to ["*.js"], which does not match 'eslint.config.mjs'.

Additional Info

I have personally made this mistake a bunch of times, and I co-authored the feature 😂. So I think this'd be valuable.

💖