Export and replay an interrupted-answer trace

Ship the browser component with a replayable accepted-event artifact.

Type: Build Languages: TypeScript, Go Stage: 4 of 4 Prerequisites: Basic functions, collections, JSON and the previous stages when applicable. Time: ~2 hours

What you build

Serialize accepted events and terminal state as a version-1 trace. Replay rebuilds the answer by running apply on each event and checks that completion agrees with the event ledger. The reusable mount component provides resume, cancellation, citations and a trace download.

Worked example

Download immediately after the first interruption. Replay yields text Caf and status interrupted. Download after resuming and replay yields the completed Unicode answer with one citation. A trace claiming completed without a complete event fails.

Implement the contract

trace(state):string; replay(text):Answer; mount(host:HTMLElement,url:string):()=>void. The returned disposer aborts work and clears the host. build-browser.ts strips native TypeScript into an importable browser module; no framework runtime is required.

Reject malformed input before producing a partial artifact. The tests include held-out records separate from the demonstration fixture.

Run your work

python3 scripts/project_test.py streaming-answer-recovery --init /tmp/streaming-answer-recovery-work
python3 scripts/project_test.py streaming-answer-recovery --stage 4 --path /tmp/streaming-answer-recovery-work --strict

Initialization copies cumulative scaffolding without replacing your work. Implement the TODO functions in the first-stage starter; later-stage starter notes describe the new behavior. Tests import the learner workspace. Run the command in the README against your own input after passing the stage.

Inspect and extend

Store transport-level byte traces separately if you need to reproduce decoder failures. This exported trace records accepted application events and status, not discarded partial bytes.

Go standard library and Node standard library. All fixtures and implementations are original.