ArtPlayer/packages/artplayer-plugin-jassub/ARCHITECTURE.md

JASSUB maintenance

src/index.js preserves the lazy factory and delegates registration to src/registration.js. The registration module constructs the actual vendor object with { video: art.video, ...option }, styles only a vendor-created canvas parent, binds host cleanup and synchronously returns { name: 'artplayerPluginJassub', instance }. Options remain live until registration; a supplied video wins. This small split keeps the public factory separate from ownership/error handling, without a general lifecycle framework or new runtime dependency.

Caller-supplied canvas nodes remain caller-owned. The adapter does not invent a parent or delete those nodes; vendor-created containers still get z-index 20. Host cleanup dynamically calls the exposed instance's current destroy method, ignores already destroyed instances and blocks synchronous reentry. A thrown disposal error is preserved and the guard resets for a later attempt. Direct repeated vendor destroy is still a separate PKG-JASSUB-07 problem; the adapter does not replace public instance methods.

If styling or host subscription throws after construction, registration independently attempts off with the exact callback and instance cleanup, then rethrows the original error. Secondary rollback errors do not replace it. An invalid/custom host whose off throws may retain an inert callback; failed vendor cleanup is not magically repaired. Failures inside the vendor constructor before it returns an instance remain 07 work.

src/jassub.es.js owns rendering, media listeners, canvas state, capability checks and worker messages. Keep this third-party file separate from the adapter's TypeScript migration. worker/ contains worker/WASM files; the actual 1.0.0/1.1.0 npm packages do not ship those files. The local demo explicitly hosts its resources under docs/assets/jassub/ and selects fonts in docs/assets/example/jassub.js. Do not move or rename those URLs as an internal cleanup.

types/artplayer-plugin-jassub.d.ts currently requires three resource URLs and describes resize/setVideo/destroy as Promise-returning. Actual historical methods are synchronous, and resize is width/height/top/left/force. Keep the existing declarations until the dedicated public type compatibility work has assessed extraction, callbacks and replacement consumers. Both option and instance expose extension indexes; they are existing compatibility boundaries.

The wrapper matches upstream jassub 1.8.8 apart from formatting and the ESLint header; worker JS and default font match that archive byte-for-byte. Local WASM instead matches the exact Pages nightly blobs associated with source 6b19a04ddfbad8f9bfd3237395788dd76218841b. Its build workflow and seven submodule revisions are pinned in the separate refactor/baselines/jassub-provenance.json supplement. All 11 demo font blobs also match the historical Pages tree. Do not replace the binaries just to match the npm version. The build has not been independently reproduced. Complete component/open-font notices and six unclear font redistribution permissions remain VENDOR-04/05 gates in PKG-JASSUB-06 / SITE-01. Source identity permits owned adapter work to proceed after 01; it does not authorize redistribution or prove original acquisition history.

Use the pinned Node/Yarn toolchain:

yarn test:jassub
node --test test/jassub-registration.test.js
node refactor/scripts/jassub-provenance.test.mjs --network
yarn build artplayer-plugin-jassub

The baseline runner verifies both actual published packages and frozen workspace inputs. Provenance tests are offline by default; explicit --network refreshes pinned source and asset comparisons and fails on any request error, without substituting cached evidence. Set ARTPLAYER_JASSUB_CANDIDATE=1 for current source behavior; ARTPLAYER_JASSUB_ARTIFACT can point at a main/legacy artifact. Tests use controlled DOM, Worker and SIMD detection, with actual vendor JavaScript. They do not render ASS or execute worker WASM. Real browser, failures, repeated destroy and resource cleanup remain later steps. Frozen failure tests now cover repeated teardown, cross-parent setVideo, custom canvas, Worker construction failure, stale video frames and incorrect fallback ratechange payloads. They assert the old failures, not candidate fixes. PKG-JASSUB-03 owns adapter cleanup; 07 owns separately tracked vendor lifecycle/clock changes and 05 verifies native behavior.

yarn test:browser test/browser/jassub-native.spec.js --workers=1 loads the actual published wrapper, Worker, WASM and default font with offscreenRender=false. Chromium/Firefox render and seek correctly; Windows WebKit's default frame-clock path remains a recorded failure. The onDemandRender=false diagnostic does not waive the default behavior gate. Native failure recovery, default offscreen mode, full devices and sustained resource release remain unverified. See ../../refactor/baselines/jassub-contract.md for precise contract and provenance evidence.