test: rewrite some files in .ts

[9romise]

In earlier Node.js versions, importing ts files directly wasn't supported, so the failing test files from #2916 have been changed to use the .ts extension in this PR.

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Latest commit: 35bfd7c

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[FloEdelmann]

Cool!

[FloEdelmann]

Looks good to me now. Thank you! 🙂

[Copilot]

Pull request overview

This PR converts several test files from JavaScript (.js) to TypeScript (.ts) to enable direct import of TypeScript files in modern Node.js versions. The changes include:

• Migration from CommonJS require() to ES6 import statements
• Addition of type annotations for better type safety
• Configuration updates to support TypeScript test files
• Addition of non-null assertions with corresponding ESLint rule disabled

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tsconfig.json	Added vitest globals types and included test TypeScript files in compilation
tests/lib/rules/comment-directive.ts	Converted from .js to .ts with ES6 imports and type annotations
tests/lib/rules/block-order.ts	Converted from .js to .ts with ES6 imports, type annotations, and removed unnecessary output: null from valid test cases
tests/lib/configs/flat.ts	Converted from .js to .ts with ES6 imports, type annotations, and added non-null assertions
tests/lib/configs/eslintrc.ts	Converted from .js to .ts with ES6 imports
eslint.config.mjs	Disabled @typescript-eslint/no-non-null-assertion rule to allow non-null assertions in TypeScript code

Comments suppressed due to low confidence (1)

tests/lib/rules/block-order.ts:4

• The import path '../../../node_modules/@types/eslint' is fragile and non-standard. Import from 'eslint' directly instead, as TypeScript will resolve the correct type definitions automatically.

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