[GTUTETTY]

Description

Written by Codex on behalf of @GTUTETTY, who reviewed this contribution and approved submission. GPT-5.6 Luna assisted with implementation and testing.

The filesystem module cache stores resolved import URLs. If an extensionless dependency changes from b.ts to b.tsx while its importer stays unchanged, the cached transform still imports the removed file.

This checks cached filesystem dependency nodes before Vitest restores a transform. If a resolved file no longer exists, Vitest discards that cache entry and lets Vite resolve the import again. Virtual and non-filesystem entries keep their current behavior.

The regression test runs the same project twice. It warms the cache with b.ts, renames the file to b.tsx, then confirms the unchanged importer runs on the second pass.

Resolves #11246

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Tests

• pnpm test:ci
• pnpm build
• pnpm typecheck
• pnpm --dir test/e2e test fs-module-cache-resiliency.test.ts
• pnpm --dir test/e2e test caching.test.ts
• CI=true pnpm lint

Documentation

• No public API or user-facing option changed.

Changesets

• The proposed PR title is fix(cache): revalidate cached imports.

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[hi-ogawa]

The idea looks close but Vite defines moduleNode.file for any modules including virtual module, so this fs bail out should be excluded for those modules. Otherwise the module that imports virtual modules become not cacheable, which is likely going too far and such virtual module plugin can opt-out the strategy on their own.

The reasonable limiting condition would be likely of this form:

vitest/packages/vitest/src/node/environments/fetchModule.ts

Lines 222 to 236 in 0598229

	private async readFileContentToCache(
	environment: DevEnvironment,
	moduleGraphModule: EnvironmentModuleNode,
	): Promise<string> {
	if (
	moduleGraphModule.file
	// \x00 is a virtual file convention
	&& !moduleGraphModule.file.startsWith('\x00')
	&& !moduleGraphModule.file.startsWith('virtual:')
	) {
	const result = await this.readFileConcurrently(moduleGraphModule.file)
	if (result != null) {
	return result
	}
	}