Add vitest & cross-platform test support

[webfiltered]

• Requires Lint & refactor codebase #539
• Makes tests platform-agnostic
• Replaces jest with vitest
• Fixes test watch issue - prevents temp files from being created in source directory
• Minor refactors / linting

┆Issue is synchronized with this Notion page by Unito

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@types/[email protected]	None	0	5.81 kB	types
npm/[email protected]	unsafe	0	4.51 kB	sindresorhus
npm/[email protected]	None	0	8.54 kB	samverschueren
npm/[email protected]	None	0	765 kB	zloirock
npm/[email protected]	None	0	9.04 kB	qix
npm/[email protected]	None	0	711 kB	sindresorhus
npm/[email protected]	None	0	13 kB	ljharb
npm/[email protected]	None	0	16.7 kB	ljharb
npm/[email protected]	None	0	12.8 kB	ljharb
npm/[email protected]	None	0	4.05 kB	qix
npm/[email protected]	None	0	14.8 kB	ljharb
npm/[email protected]	None	0	22.1 kB	ljharb
npm/[email protected]	None	0	3.88 kB	sindresorhus
npm/[email protected]	None	0	20.8 kB	ljharb
npm/[email protected]	None	0	22.2 kB	ljharb
npm/[email protected]	None	0	22 kB	ljharb
npm/[email protected]	None	0	10.4 kB	isaacs
npm/[email protected]	None	0	5.39 kB	eventualbuddha
npm/[email protected]	None	0	2.97 kB	thejameskyle
npm/[email protected]	None	0	26.6 kB	audrey.e
npm/[email protected]	None	0	5.41 kB	sindresorhus
npm/[email protected]	None	0	17.7 kB	blakeembrey
npm/[email protected]	None	0	10.9 kB	ljharb
npm/[email protected]	None	0	6.73 kB	sindresorhus
npm/[email protected]	filesystem	0	6.05 kB	sindresorhus
npm/[email protected]	None	0	314 kB	dmitrysoshnikov
npm/[email protected]	None	0	66 kB	jviereck
npm/[email protected]	None	0	16.7 kB	ljharb
npm/[email protected]	None	0	23.4 kB	kemitchell
npm/[email protected]	None	0	11.8 kB	kemitchell
npm/[email protected]	None	0	3.31 kB	sindresorhus
npm/[email protected]	None	0	16.6 kB	kemitchell
npm/[email protected]	None	0	15 kB	ljharb

🚮 Removed packages: npm/@jest/[email protected], npm/@jest/[email protected], npm/@jest/[email protected], npm/@sinclair/[email protected], npm/@types/[email protected], npm/@types/[email protected], npm/@types/[email protected], npm/@types/[email protected], npm/@types/[email protected], npm/@types/[email protected], npm/@types/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected], npm/[email protected]

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[huchenlei]

Will review after rebase.

[robinjhuang]

LGTM

[webfiltered]

This PR introduces a dev-only, but mildly annoying regression - vite v6 upgrade breaks 'watch' mode.

Resolved in #544. No impact to prod.

(Edit: Added this comment just for history / ease of any future review. With the scope so small, I don't believe it is worth the effort to re-rebase the PRs, or overcomplicate this one.)