One line of setup
Point Vitest or Jest at one setup file and every test starts from isolated state.
TypeScript Test Toolkit
A Vitest / Jest per-test setup, async-operation tracking, strictProxy and mock helpers, usable in any TypeScript project.
Awaitable fire-and-forget
Drain every fire-and-forget operation before asserting, with waitForAllAsyncOperations().
No swallowed errors
A rejection nobody awaited, or a Node warning, fails the test instead of scrolling past.
Strict mocks
strictProxy throws on every member a mock did not provide, instead of returning undefined.