workers-vitest-pool

To set up vitest tests for a new Cloudflare Worker, pin the modern stack from day one using vitest 4, pool-workers ≥0.15, and Node 22, then apply the known-good configuration patterns for TypeScript and CI.

Migrating Cloudflare Workers from older pool-workers to Vitest 4 requires following a known-good v2→v4 migration recipe to upgrade legacy versions and align with the modern pool-workers ≥0.15 requirement.

The 'Isolated storage failed' and 'Expected .sqlite, got .sqlite-shm' errors in vitest-pool-workers occur due to per-test storage isolation issues, which require upgrading to the modern stack configuration to resolve.

Testing Cloudflare Workers with vitest-pool-workers requires Node 22, Vitest 4, and pool-workers version 0.15 or higher to ensure a reliable setup and avoid legacy isolation issues.

Yes, vitest-pool-workers supports upgrading legacy versions below 0.13 by applying a documented migration recipe that transitions existing Workers from Vitest 2 or 3 to the modern Vitest 4 stack.