feat(typescript-estree): add defaultProject for project service

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes Bug: Project service doesn't infer compilerOptions for files not included in a tsconfig.json #8206
• That issue was marked as accepting prs
• Steps in Contributing were taken

Overview

Adds a defaultProject property to the existing ProjectServiceOptions config object. Folks should be able to use it like:

EXPERIMENTAL_useProjectService: {
  allowDefaultProjectForFiles: ["./*.js"],
  defaultProject: "./tsconfig.json"
}

...except, I can't find an API to use the default project in the project service. Filing as a draft for reference while I ask about it. Chatted with @jakebailey and @sandersn in the TypeScript Discord. service.setCompilerOptionsForInferredProjects is the right API. Thanks!

❤️‍🔥

[typescript-eslint]

Thanks for the PR, @JoshuaKGoldberg!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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✅ Successfully ran 31 targets

• nx test eslint-plugin
• nx test typescript-estree
• nx test visitor-keys
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• nx test utils
• nx run types:build
• nx test type-utils
• nx run repo-tools:postinstall-script
• nx test parser
• nx test repo-tools
• nx test typescript-eslint
• nx test rule-schema-to-typescript-types
• nx test scope-manager
• nx test eslint-plugin-internal
• nx run-many --target=lint --parallel --exclude eslint-plugin
• nx test visitor-keys --coverage=false
• nx test ast-spec
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint
• nx test typescript-estree --coverage=false
• nx run-many --target=typecheck --parallel
• nx test repo-tools --coverage=false
• nx test scope-manager --coverage=false
• nx test parser --coverage=false
• nx test utils --coverage=false
• nx test type-utils --coverage=false
• nx test eslint-plugin-internal --coverage=false
• nx test typescript-eslint --coverage=false
• nx test rule-schema-to-typescript-types --coverage=false
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• nx run integration-tests:test
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[JoshuaKGoldberg]

Fun fact: ts.readConfigFile has two unhappy paths:

• If the config file is valid JSON but not right for TypeScript, it returns an object
• If the config file is invalid JSON, it throws

🙌 error handling!

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 88.01%. Comparing base (ecb6b55) to head (3c64b54).
Report is 43 commits behind head on main.

❗ Current head 3c64b54 differs from pull request most recent head 33776db. Consider uploading reports for the commit 33776db to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8815      +/-   ##
==========================================
- Coverage   88.02%   88.01%   -0.02%     
==========================================
  Files         405      405              
  Lines       14089    14099      +10     
  Branches     4125     4127       +2     
==========================================
+ Hits        12402    12409       +7     
- Misses       1382     1385       +3     
  Partials      305      305              

Flag	Coverage Δ
unittest	88.01% <90.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...-estree/src/create-program/createProjectService.ts	77.27% <90.00%> (-6.07%)	⬇️

[JoshuaKGoldberg]

I couldn't figure out a way to get this to execute in tests. 🤷

[bradzacher]