api events

Events

k6 runtime events carry live process output, live metrics, terminal completion, and execution errors from Rust to React. Event names are defined in both src/lib/loadrift/api.ts and src-tauri/src/events.rs.

Event	Payload	Description
k6:output	string	Streams k6 stdout, stderr, and runtime messages to the frontend log
k6:metrics	RunMetricsEvent	Emits initial and live metrics for a run
k6:complete	TestCompletion	Emits final state, finish reason, metrics, result, result source, summary issue, and optional error
k6:error	RunErrorEvent	Emits non-threshold execution errors

Run scoping

src/features/test/useTestHarness.ts filters metrics and completion by active run ID. That prevents stale events from previous runs from replacing the current UI state.

Completion versus error

Threshold failures complete through k6:complete with a failed result. Execution errors can also emit k6:error after completion state is recorded in src-tauri/src/k6/process/runtime.rs.

Key source files

File	Purpose
src/lib/loadrift/api.ts	Event constants and subscription signatures
src/lib/loadrift/types.ts	Event payload types
src/lib/tauri/client.ts	Window-scoped event listeners
src-tauri/src/events.rs	Event emitters
src/features/test/useTestHarness.ts	Frontend event handling

For the command side of the API, see Tauri commands.