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perf(status-bar): keep the pre-ready closed-count branch allocation-free

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This commit is contained in:
Brennan Benson
2026-07-15 14:57:42 -07:00
parent b4ae485f5d
commit cf4da1086c
1 changed files with 6 additions and 2 deletions
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src/renderer/src/components/status-bar/resource-session-count-selector.ts
+6 -2
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@@ -73,6 +73,10 @@ function countRunningBoundPtyIds(
return boundPtyIds.size - dead
}
// Why: the pre-ready branch runs on every store notification during startup;
// a shared constant keeps it allocation-free.
const EMPTY_BOUND_PTY_IDS: ReadonlySet<string> = new Set()
export function createClosedResourceSessionCountSelector(
buildBindingIndex: BuildResourceSessionBindingIndex = buildResourceSessionBindingIndex
): ClosedResourceSessionCountSelector {
@@ -84,7 +88,7 @@ export function createClosedResourceSessionCountSelector(
let previousTerminalLayoutsByTabId: AppState['terminalLayoutsByTabId'] = {}
let previousWorkspaceSessionReady = false
let previousDeadPtyIds: AppState['deadPtyIds'] = {}
let boundPtyIds: ReadonlySet<string> = new Set()
let boundPtyIds: ReadonlySet<string> = EMPTY_BOUND_PTY_IDS
let count = 0
return (state): number => {
@@ -113,7 +117,7 @@ export function createClosedResourceSessionCountSelector(
boundPtyIds = buildBindingIndex(state).boundPtyIds
count = countRunningBoundPtyIds(boundPtyIds, state.deadPtyIds)
} else if (!state.workspaceSessionReady) {
boundPtyIds = new Set()
boundPtyIds = EMPTY_BOUND_PTY_IDS
count = 0
} else if (deadPtyIdsChanged) {
count = countRunningBoundPtyIds(boundPtyIds, state.deadPtyIds)