1.9 KiB
Agent Note: API extractor reports
Status: proposed
English | 中文
Split out from the original "Doc-sync and API reports" Agent Note (2026-06-11). Parts 1-2 (doc-block typechecking, event-taxonomy verification) shipped — see doc-sync enforcement. This is the deferred part 3, kept as a standalone proposal.
Problem
Public API changes are invisible — nothing makes "this commit changed the public surface" an explicit, reviewable fact. A reviewer reading a diff can miss that an exported type gained a field or a method signature shifted.
Proposal
api-extractor (or tsc --emitDeclarationOnly + a normalized public-surface dump) producing a checked-in etc/<pkg>.api.md per package; CI fails if regeneration differs. Every public-API change becomes a diff line a reviewer (or review agent) must see.
Alternatives considered
tsc --emitDeclarationOnly plus a normalized public-surface dump — the lighter mechanism if api-extractor proves too heavy; either satisfies the checked-in, diffable report shape the proposal needs.
Acceptance criteria
- Every package has a checked-in
etc/<pkg>.api.md; CI fails when regeneration differs from the committed report. - A public-API change (a new export, a widened field, a shifted signature) is visible as a report diff line in review.
Risks
The dependency is heavy and finicky — the reason this was deferred — and the report format churns with compiler upgrades, adding a maintenance surface that buys little while the packages stay unpublished.
Why deferred
Deferred when doc-sync landed: low value for an internal monorepo where reviewers already see the source diff, and a heavy, finicky dependency. Revisit if the packages are ever published externally — at that point a stable, diffable public surface earns its keep.