Development

pnpm install
pnpm run build            # tsdown → dist (ESM + CJS + types)
pnpm run typecheck        # tsc --noEmit on src, since tsdown doesn't fully type-check
pnpm run typecheck:test   # tsc --noEmit on src + test (separate tsconfig, no rootDir conflict)
pnpm run test             # vitest run
pnpm run test:watch       # vitest, watch mode
pnpm run test:coverage    # vitest run --coverage (v8 provider)
pnpm run changeset        # record a change for the next release

Tests live in tests/, mirroring src/: VernLLM.call.test.ts and VernLLM.schema.test.ts cover retry/backoff/timeout/abort/schema/model-override/usage behavior, circuitBreaker.test.ts covers the breaker as a unit and its integration with call(), cachedCall.test.ts covers caching and usage reservation/refund, logger.test.ts covers the injectable logger, and test/adapters/*.test.ts cover each provider adapter's request/response translation against a fake client — no real API calls are made anywhere in the suite.