feat: add options.type

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: eslint.config.js used with ESM even if package type is "commonjs" #2111
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Goes a different, more comprehensive direction than #2110. Instead of encouraging a blockPackageJson it promotes type to a top-level option. --type commonjs will now work if a user really wants.

blockESLint will now print its config as eslint.config.mjs if options.type is "commonjs". It's still eslint.config.js otherwise.

🎁

[github-actions]

PR Compliance Checks Passed!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.80%. Comparing base (9648653) to head (8c2e1a4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2112   +/-   ##
=======================================
  Coverage   99.80%   99.80%           
=======================================
  Files         127      127           
  Lines        5214     5238   +24     
  Branches      361      369    +8     
=======================================
+ Hits         5204     5228   +24     
  Misses         10       10           

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[JoshuaKGoldberg]

😬 JoshuaKGoldberg/package-json-validator#178 is failing linting with:

$ pnpm lint

> [email protected] lint /Users/josh/repos/package-json-validator
> eslint . --max-warnings 0


/Users/josh/repos/package-json-validator/create-typescript-app.config.mjs
  8:1  error  Parsing error: 'import' and 'export' may appear only with 'sourceType: module'

/Users/josh/repos/package-json-validator/eslint.config.mjs
  1:1  error  Parsing error: 'import' and 'export' may appear only with 'sourceType: module'

✖ 2 problems (2 errors, 0 warnings)

Sigh. I'll have to add some .mjs-specific parsing shenanigans, or something like that.

[github-actions]

🎉 This is included in version v2.23.0 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀