@fyso/system-lab

Local-first executable explanations for JavaScript and TypeScript tests.

Install

npm install --save-dev @fyso/system-lab

Create .system-lab/project.json in the target repository:

{
  "schemaVersion": "1",
  "project": { "name": "My project" },
  "sources": [{ "root": "test", "adapterId": "node-test" }]
}

Run

npx system-lab serve --allow-generate --port 4182

The explorer is served only on loopback. Generated snapshots are stored in the target repository under .system-lab/cache and may be committed.

Use --brain claude to opt into semantic explanations through the local Claude CLI. The browser never receives repository or process access.