Testing

bash

npm run test

test/detect-content-major.test.ts — version detection
test/normalize-toc.test.ts — TOC shape helpers
test/content-v3.test.ts — e2e against content-v3 playground
test/content-v2.test.ts — e2e against content-v2 playground

Run npm run dev:prepare before e2e so playgrounds have dependencies and the module stub.