Expand VX runtime commands and subscriptions#683
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Lines 2310 to 2311 in b985fb9
Keep keydown and keyup subscriptions distinct
When an app batches keyboard_on_key_down(key: "Escape", ...) with keyboard_on_key_up(key: "Escape", ...), both helpers emit kind: "keyboard" with the same stable key, while the runtime subscription identity is based on kind:key. The second descriptor therefore replaces the first during sync, so one of the two listeners never runs; include the event name in the stable identity or store the browser key filter separately from the subscription key.
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| const dispose = await runner(subscription, mappedContext.context); | ||
| active.set(key, { |
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When built-in runners such as online_status, window_resize, visibility_change, and media_query call context.dispatch() during setup, this await yields before the record is inserted into active. If that initial message's step removes or replaces the subscription, the nested sync sees no active record to dispose, then the outer sync resumes and stores a listener the app no longer requested; subsequent browser events keep dispatching from a stale subscription. Insert the active record before setup can run queued initial messages, or defer those initial emits until after active.set.
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| if (context.deferAfterCommands) { | ||
| context.deferAfterCommands(dispatchInitial); |
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When a step installs location_change and one of its commands synchronously dispatches a message whose resulting step removes that subscription, the disposer runs but the queued dispatchInitial callback remains in the outer command phase. After commands finish it can still dispatch a location message for a subscription that is no longer active, so apps can receive stale route updates after unsubscribing; make the disposer mark this initial callback as cancelled before it runs.
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Summary
Validation
npx vitest packages/vx-dom/src/__tests__/browser.test.ts packages/vx-dom/src/__tests__/app-runtime.test.ts apps/smoke/src/vx-dom.test.tsnpm run typechecknpm test(rerun with local socket access after sandbox blocked std-http listener creation on127.0.0.1)Review