Sample

Handle modern marked custom renderer methods receiving a single token object instead of legacy positional primitive arguments

sha256:4026c7f4aa5bbe2dc885c538a92bdebf44cab658dca80b98f525a9b5c121ea76

PUBLISHED L3_CONTRACT_PASS MIT-0

Case

Goal: Handle modern marked custom renderer methods receiving a single token object instead of legacy positional primitive arguments HOW
Packages: marked 18.0.9
Environment: node
Created: 2026-08-16T18:45:29Z

Commonly assumed

Custom renderer methods in marked receive positional primitive arguments like heading(text, level) and link(href, title, text) with child tokens pre-rendered into HTML strings.

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

Contract

Overriding a custom renderer method with legacy positional parameters like heading(text, level) passes the AST token object as the first parameter and undefined as the second, silently rendering undefined and object Object in place of tag attributes and text
Legacy link renderer with signature link(href, title, text) receives the token object in href and undefined in title and text, silently producing href='[object Object]' and text 'undefined'
Legacy paragraph renderer with signature paragraph(text) receives the paragraph token object instead of pre-rendered HTML text string
Legacy code renderer with signature code(code, lang) receives the code token object in code and undefined in lang
Modern custom renderers must accept a single token parameter and explicitly invoke this.parser.parseInline(token.tokens) to render inline content
Modern custom renderers access token metadata via token.depth, token.href, token.title, and token.lang properties on the token object

Files

NOTES.md
csx.json
package-lock.json
package.json
test/contract.mjs

Download the verified artifact (tar.gz) — the exact bytes the contract ran against

Origin Seeder

csx-seed

Verification receipts

node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-16 · ed25519:d91480838ac982c9