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listenrightmeow edited this page Jul 17, 2026 · 4 revisions

CLI Reference

All commands take --config <path> (default feat.config.json). Exit codes are uniform: 0 success · 1 validation failure · 2 configuration error.

feat init

Scaffold a project: feat.config.json, a first spec (specs/greet.feat), and its contract. Refuses to overwrite an existing config (exit 2). Prints next steps.

feat parse <file>

Parse and validate one spec. Prints the intermediate representation (JSON) on success; on failure, a coded error with location and a hint:

ERROR [UNKNOWN_SERVICE_KEY] specs/create-flow.feat
  Service 'cache' is not configured.
  Hint: Configured services: eventStore, projectionStore, eventBroker

Twelve error codes cover the pragma (MISSING_PRAGMA, UNSUPPORTED_VERSION), grammar (MALFORMED_SYNTAX), the four closed spaces (UNKNOWN_SERVICE_KEY, UNKNOWN_COMMAND, UNDECLARED_SCHEMA, UNKNOWN_ACTOR), and structure (DUPLICATE_SCENARIO_NAME, TRIGGER_MISMATCH, QUERY_SIDE_EFFECT, INCOMPLETE_PREDICTION, MISSING_MINIMUM).

feat generate

Compile every spec (specs.dir + pattern from config; fixtures/ directories are excluded by convention) into its test file, written next to the spec per specs.outputPattern. Generated files are complete and self-contained: resolved schemas, golden fixtures, and seed fixtures are inlined; the only runtime import is the Feature runtime. The header carries the source reference, language and emitter versions, and a hash of the inputs — no timestamps.

feat verify

The CI integrity gate. Regenerates in memory and byte-compares against the committed files:

ERROR [VERIFY_FAILED] Committed tests do not match current specs:
  packages/feat-core/parse.test.ts (differs)
  Run "feat generate" and commit the updated files.

feat run [--spec <ID>] [--coverage]

Execute the generated suites through a vitest subprocess. Adapters load by dynamic import from the config (createAdapter contract); each test file gets its own adapter instances; capture windows respect per-service consistency. Writes JUnit XML when report.format includes "junit". --coverage passes through to the runner's coverage provider.

feat report [--junit]

Summarize the last run from the JUnit output — per-suite pass/fail counts, exit 1 if anything failed. --junit prints the XML path for CI import.

feat audit

The buildability gate, per spec:

  • B1 — a handler at exists for code-producing types.
  • B2 — two-way traceability: every predicted rejection ID has a rejects directive and vice versa (outline-expanded IDs included).
  • B3 — touches change boundaries declared.
  • Warnings: missing paired contract, missing generated test, draft status.

feat lint

Language-quality warnings: schemas declared but never referenced by a scenario (input is exempt — it is the when-payload's contract by definition), duplicate declarations, lifecycle surfacing.

feat fmt [--check]

Conservative, content-preserving canonicalization: trailing whitespace, blank-line collapse, final newline; reports tabs-in-indentation (a parse error) rather than rewriting them. --check exits 1 if anything would change.

feat watch [--run] [--json] [--src <dir>]...

Regenerates on any .feat or .contract.json change under the specs directory. Regeneration is byte-hash gated: a change that does not alter a generated suite does not re-emit or rerun it.

  • --run — run the affected generated suites after each regeneration (startup runs all).
  • --src <dir> (repeatable) — also watch implementation directories; a source change reruns all suites without regeneration.
  • --json (implies --run) — emit NDJSON events to stdout for machine consumption: generate, run (per-case results; suite names are spec anchors), source-change, error. This is the contract IDE integrations consume — the VS Code extension spawns feat watch --json and paints failing predictions on the scenario line of the .feat source.

feat diff <file> [--ref <git-ref>]

Spec-level change summary against a git ref (default HEAD) — added/removed/changed scenarios, status transitions, and contract interface changes. Built for PR review: the reviewer reads what the contract changed, not a wall of generated-test diff.

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