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Draw the celebration on the main thread, not in a blocked worker

6b7d6a1897dca7a8f42669a02c3f6981192ccd22 · Keenan Nemetz · 13d ago · parent 0f8054ad

Draw the celebration on the main thread, not in a blocked worker

The burst never painted. canvas-confetti's default export is built with
useWorker: true, and it builds that worker from a blob: URL, which this page's
CSP (default-src 'self', no worker-src) blocks. The library does not fall back:
it transfers its canvas to the worker with transferControlToOffscreen and then
posts to it, so the canvas is created, is full-size, is permanently empty, and
reports no error. reload, shared link and bookmark behaviour, and the address-bar
strip, all worked — which is why the flag looked handled and the burst looked
absent.

Creating our own instance with useWorker: false draws on the main thread, where
120 particles for ~2s cost nothing, and needs no CSP change. Widening the policy
with worker-src blob: to keep the offscreen path would trade a real security
boundary for a party trick.

Verified by clicking Merge in a real Firefox against a scratch instance: the
canvas has 4148 non-transparent pixels and no transferred context. The same
probe against the old build reports getContext failing with InvalidStateError.

docs/ui-plan.md +7

@@ -303,6 +303,13 @@ or a shared link is an ordinary visit; the library honours
	303	303	nothing for it, which is why the 25 KB bundle is acceptable where a
	304	304	loaded-always library would not be.
	305	305
		306	The burst always comes from an instance created with `useWorker: false`. The
		307	library's default export opts into a Web Worker built from a `blob:` URL, which
		308	`default-src 'self'` blocks — and it transfers its canvas to that worker before
		309	drawing, so the canvas appears and stays empty with no error. Drawing on the main
		310	thread avoids the CSP question entirely instead of widening the policy with
		311	`worker-src blob:` for a celebration.
		312
	306	313	The route table is `server/routes.go`, one function per surface (assets, global,
	307	314	auth, admin, repository, git). Routes are grouped by prefix rather than by
	308	315	registration order because `ServeMux` ranks by pattern specificity, and the