companion: port to TypeScript

[kvz]

Supersedes #6178.

This branch keeps the exact same final content as #6178, but splits history for reviewability:

1. chore(companion): rename source and test files from .js to .ts (pure git mv, no content changes)
2. feat(companion): port Companion to TypeScript (actual content/type/schema/build updates)

Validation note:

• Final tree is byte-for-byte identical to ts-companion (7b5b16a298690b0492de4cc4fab744f998b45570).

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Latest commit: 45f32fe

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​types/​cookie-parser@​1.4.2
	@​types/​cors@​2.8.6
	next@​16.1.5
	@​react-router/​express@​7.12.0
	cssnano@​7.0.7
	@​angular/​platform-browser-dynamic@​19.2.17
	@​types/​express@​4.17.23
	@​typescript-eslint/​parser@​7.13.1
	@​types/​compression@​1.7.0
	@​types/​common-tags@​1.8.4
	@​tailwindcss/​vite@​4.1.11
	@​angular-devkit/​build-angular@​19.2.15
	@​types/​react-dom@​19.1.9
	@​types/​jasmine@​5.1.4
	@​angular/​platform-browser@​19.2.17
	concat-stream@​2.0.0
	express-interceptor@​1.2.0
	light-server@​2.9.1
	lodash@​4.17.23
	@​angular/​compiler-cli@​19.2.17
	@​react-router/​dev@​7.12.0
	@​angular/​animations@​19.2.17
	@​angular/​cli@​19.2.15
	@​angular/​forms@​19.2.17
	@​angular/​router@​19.2.17
	@​angular/​common@​19.2.17
	@​types/​eslint@​8.56.10
	@​angular/​compiler@​19.2.18
	vitest@​3.2.4
	@​types/​react@​18.3.24
	react-router@​7.12.0
	@​angular/​core@​19.2.18
	escape-goat@​3.0.0
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[kvz]

the new bin points to dist/

[kvz]

Extra strict typescript options, but just for linting, as to remain compatible with status quo outputs for now

[Murderlon]

I ran it through Devin Review, it has some comments: https://app.devin.ai/review/transloadit/uppy/pull/6179

[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm ioredis is 96.0% likely obfuscated Confidence: 0.96 Location: Package overview From: packages/@uppy/companion/package.json → npm/ioredis@5.7.0 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/ioredis@5.7.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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[kvz]

I ran it through Devin Review, it has some comments: https://app.devin.ai/review/transloadit/uppy/pull/6179

That was helpful! Added the patches to address. Also kicked another review and added patches for the findings then. Each time covered by added regression tests.