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// atomically set mode in store store.setMode(instanceId, mode);
let currentInitId = null;
function mountViewer() { const unsub = eventBus.subscribe('mode-change', handler); onUnmount(() => unsub()); } Versioned async operations: viewerframe mode refresh hot
function setModeAsync(mode) { const v = ++modeVersion; return doAsyncSetup(mode).then(result => { if (v !== modeVersion) return; // ignore stale applyMode(result); }); } Debounce/coalesce: // atomically set mode in store store
// finalize finalizeModeActivation(instanceId, mode); } Subscription cleanup: let currentInitId = null
// prepare resources await prepareResourcesFor(mode); if (currentInitId !== initId) return; // stale, abort
let modeVersion = 0;
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