use TS natively and switch to pnpm

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[Copilot]

Pull request overview

This pull request migrates the project from using external TypeScript tooling (tsx) to Node.js native TypeScript support via the --experimental-strip-types flag. This modernizes the development workflow to leverage built-in Node.js capabilities.

Changes:

• Replaced tsx with Node.js --experimental-strip-types flag for development and testing
• Updated TypeScript configuration to use inline compiler options instead of extending from @sindresorhus/tsconfig
• Changed all relative imports from .js to .ts extensions and adopted import type syntax for type-only imports

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tsconfig.json	Replaced external config extension with inline compiler options for Node.js native TS support
src/service.test.ts	Updated imports to use .ts extensions and split type imports
src/observer.ts	Changed Adapter import to type-only import
src/bin.ts	Updated imports to .ts extensions and split type-only imports
src/app.ts	Updated imports to .ts extensions, split type imports, removed resolved @ts-expect-error comment
src/app.test.ts	Updated imports to use .ts extensions and type-only import syntax
package.json	Updated scripts to use Node.js native TS, removed tsx dependency, updated dependency versions
pnpm-lock.yaml	Updated lockfile reflecting dependency changes

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Copilot]

Major version updates for @tinyhttp/app (2.4.0 → 3.0.1) and chokidar (4.0.1 → 5.0.0) may introduce breaking changes. While these updates are included in the lockfile, ensure that the application has been tested with these new versions and that no breaking changes affect the codebase. Review the changelogs for these packages to understand what changed.

[Copilot]

The oxlint package version has been downgraded from ^1.39.0 to ^1.38.0. This appears to be a regression rather than an intentional change, as package updates typically move forward. Consider updating to the latest available version instead of downgrading.

Suggested change

	"oxlint": "^1.38.0",
	"oxlint": "^1.39.0",