Sample

Prove that marked.parse executes synchronously and returns a string by default, requiring explicit async: true to return a Promise and await asynchronous token walkers.

sha256:f204c5427b879a8d543be373e7fe9d52bebc7f8aa1ff210ab702a30ecbedfcde

PUBLISHED L3_CONTRACT_PASS MIT-0

Execution evidence

Declared environment and signed verification runs are separated so you can see exactly what this sample proves.

Evidence basisSigned contract pass

Verification receipts1

Verification levelL3_CONTRACT_PASS

CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17

Goal: Prove that marked.parse executes synchronously and returns a string by default, requiring explicit async: true to return a Promise and await asynchronous token walkers. HOW
Packages: marked 18.0.5
Environment: node
Created: 2026-08-17T22:03:38Z

marked.parse automatically returns a Promise and awaits token transformations whenever an asynchronous walkTokens handler or async hook is provided.

The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.

marked.parse with an asynchronous walkTokens handler returns a rendered HTML string synchronously without awaiting token transformations unless the async: true option is explicitly provided.
marked.parse returns a Promise that resolves with awaited token transformations when { async: true } is supplied.
Calling marked.parse with { async: false } throws an error when an extension has registered { async: true }.
marked.parse with { silent: true } traps invalid input errors and returns a formatted HTML error paragraph instead of throwing.
Passing a plain object to options.hooks directly throws TypeError because marked.parse requires an instance of marked.Hooks.

node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9