feat: support npm setup files

[tmkx]

For example:

{
  test: {
    setupFiles: ['@testing-library/jest-dom/extend-expect.js'],
  },
}

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[antfu]

Suggested change

	const require = createRequire(resolve(resolved.root, '_'))
	const require = createRequire(resolve(resolved.root, '_'))

What's the _ for?

[tmkx]

just a placeholder, createRequire needs a file, maybe using index.js more readable?

[antfu]

Can we use resolveModule from local-pkg?

[tmkx]

I have tried, resolveModule uses const _require = createRequire(import.meta.url), it's hard code as import.meta.url, but we need relative to root here. otherwise causes some bad cases.

[sheremet-va]

This will incorrectly resolve esm files. We use Vite's resolver, when importing files.

vitest/packages/vite-node/src/server.ts

Line 33 in 03a54e0

async resolveId(id: string, importer?: string): Promise<ViteNodeResolveId | null> {

vitest/packages/vite-node/src/client.ts

Line 127 in 03a54e0

const resolveId = async (dep: string, callstackPosition = 1) => {

Maybe we should just remove resolving for non-relative paths here. Reporter field for example supports these kind of pathes.

[tmkx]

vitest/packages/vitest/src/node/config.ts

Line 125 in 03a54e0

resolved.setupFiles = toArray(resolved.setupFiles || []).map(file => resolve(resolved.root, file))

The setupFiles will prepend config.root path directly,

{
  test: {
    setupFiles: ['@testing-library/jest-dom/extend-expect.js'],
  },
}

will be transformed to:

{
  test: {
    setupFiles: ['/path/to/@testing-library/jest-dom/extend-expect.js'],
  },
}

it should be:

{
  test: {
    setupFiles: ['/path/to/node_modules/@testing-library/jest-dom/extend-expect.js'],
  },
}

[sheremet-va]

LGTM 👍🏻