backend-vitest

Vitest provides zero-config TypeScript testing with native ESM support and Jest-compatible API. It eliminates setup overhead while delivering instant watch mode and built-in coverage reporting through simple vitest.config.ts configuration.

Yes. Vitest is optimized for testing tRPC procedures, Zod schemas, utilities, and React components in Vite-based projects. It runs in Node or jsdom environments with full TypeScript integration and zero additional configuration needed.

Vitest uses ESM by default and integrates directly with Vite for instant test execution without transformation overhead. Jest requires additional TypeScript configuration and has slower startup; Vitest prioritizes speed and modern JavaScript standards.

Vitest handles coverage and environment configuration through setupFiles, include patterns, and environment selection in vitest.config.ts. The @vitest/coverage-v8 dependency enables detailed coverage reports without extra tooling.

Yes. The vitest-mock-extended dependency provides TypeScript-first mocking utilities for unit tests. Combined with Vitest's built-in mocking capabilities, it enables type-safe mock creation for complex dependencies.