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The two edge-case typing leaves become the typing builtin at their combined weight: that text is deliberately not domain-specific, so naming the field and leaving the text to the policy is the designed path, and it keeps the seeded arm on the corpus while the model writes its own. Total weight is unchanged at 165, so every surviving branch keeps its share and submitTxn stays at 9.70 percent. Claude-Session: https://claude.ai/code/session_01A5KmftdEJ49A9z5mF5ESrX
Folio (web)
A React + Vite port of the folio personal-ledger app: login with demo credentials, create accounts, add credits and debits. Exists as the minimal web example sanderling runs its property-based specs against.
Stack
- React 19 + Vite + TypeScript
- Stable HTML
idattributes on every interactive element so the spec targets DOM nodes by id, not by aria-label parsing data-*attributes (data-cents,data-account-id,data-txn-count) carry structured numeric state for property assertions
Prerequisites
justbun(installs the JS toolchain; the project usesbun.lock, notpackage-lock.jsonorpnpm-lock.yaml)- Chrome installed (sanderling drives it via CDP)
bun install
Demo credentials
email: [email protected]
password: ledger123
Run a sanderling test
just test
The justfile boots the Vite dev server on port 5173, waits for the port
to respond, then runs sanderling test --platform web --bundle-id http://localhost:5173 against it. Override the port with PORT=4000 just test; DURATION, SEED, and OUTPUT work the same way as in the KMP
folio example.
Traces land in ./sanderling/runs/<timestamp>/.
How it connects to sanderling
- The spec at
sanderling/spec.tsfinds elements by HTMLid(#email,#add-account,#ledger,#txn-amount, ...). Anything the spec touches has a stable id in the markup. - Numeric state the spec asserts on is exposed via
data-centsand similar attributes. The spec readsel.attrs["data-cents"]rather than parsing currency strings out ofaria-label. - Account cards expose
data-account-id+data-balanceso the spec can correlate cards across steps without depending on DOM order. just testinvokessanderling test --platform web, which connects to Chrome via the Chrome DevTools Protocol; no extension or app SDK is involved.