feat: ai 的随机修复

src/utils/performanceShim.ts

@@ -0,0 +1,165 @@
+/**
+ * Performance shim — replaces globalThis.performance to prevent JSC's C++ Vector
+ * from growing without bound.
+ *
+ * In Bun, globalThis.performance is JSC's native Performance object. It stores
+ * marks, measures, and resource timings in a C++ Vector that never shrinks even
+ * after clearMarks(). Long-running sessions (daemon, /loop) accumulate hundreds
+ * of MB of dead capacity.
+ *
+ * This shim keeps performance.now() on the native object (fast, no memory cost)
+ * but redirects mark/measure/getEntries operations to a plain JS Map that the GC
+ * can reclaim. Third-party code (React reconciler, OTel/Langfuse) uses
+ * performance.now() for timing — that stays native. The accumulating operations
+ * go to GC-able JS memory instead.
+ *
+ * MUST be installed before React/OTel import — see cli.tsx first import.
+ */
+
+const original = globalThis.performance
+
+// JS-backed storage — fully GC-able
+const marks = new Map<string, number>()
+const measures = new Map<
+  string,
+  { name: string; startTime: number; duration: number }
+>()
+
+function now(): number {
+  return original.now()
+}
+
+function mark(name: string): PerformanceMark {
+  marks.set(name, now())
+  // Return a minimal PerformanceMark-like object to satisfy the interface.
+  // React/OTel only use mark() for side effects, not the return value.
+  return {
+    name,
+    entryType: 'mark',
+    startTime: marks.get(name)!,
+    duration: 0,
+  } as PerformanceMark
+}
+
+function measure(
+  name: string,
+  startMarkOrOptions?: string | MeasureOptions,
+  endMark?: string,
+): void {
+  let startTime: number
+  let duration: number
+
+  if (typeof startMarkOrOptions === 'string') {
+    const start = marks.get(startMarkOrOptions)
+    const end = endMark ? marks.get(endMark) : now()
+    startTime = start ?? now()
+    duration = (end ?? now()) - startTime
+  } else if (startMarkOrOptions && typeof startMarkOrOptions === 'object') {
+    startTime = startMarkOrOptions.start ?? 0
+    duration = (startMarkOrOptions.end ?? now()) - startTime
+  } else {
+    startTime = 0
+    duration = now()
+  }
+
+  measures.set(name, { name, startTime, duration })
+}
+
+interface MeasureOptions {
+  start?: number
+  end?: number
+  detail?: unknown
+}
+
+interface PerformanceEntryLike {
+  readonly name: string
+  readonly entryType: string
+  readonly startTime: number
+  readonly duration: number
+}
+
+function getEntriesByType(type: string): PerformanceEntryLike[] {
+  if (type === 'mark') {
+    return [...marks.entries()].map(([name, startTime]) => ({
+      name,
+      entryType: 'mark',
+      startTime,
+      duration: 0,
+    }))
+  }
+  if (type === 'measure') {
+    return [...measures.values()].map(m => ({
+      name: m.name,
+      entryType: 'measure',
+      startTime: m.startTime,
+      duration: m.duration,
+    }))
+  }
+  return []
+}
+
+function getEntriesByName(name: string, type?: string): PerformanceEntryLike[] {
+  const entries = getEntriesByType(type ?? 'mark').concat(
+    type === undefined ? getEntriesByType('measure') : [],
+  )
+  return entries.filter(e => e.name === name)
+}
+
+function clearMarks(name?: string): void {
+  if (name !== undefined) {
+    marks.delete(name)
+  } else {
+    marks.clear()
+  }
+}
+
+function clearMeasures(name?: string): void {
+  if (name !== undefined) {
+    measures.delete(name)
+  } else {
+    measures.clear()
+  }
+}
+
+// Plain object shim — must NOT inherit from Performance.prototype because
+// native getters (onresourcetimingbufferfull, timeOrigin, toJSON) check
+// that `this` is an actual JSC Performance instance and throw otherwise.
+const shim = {
+  now,
+  mark,
+  measure: measure as typeof performance.measure,
+  getEntriesByType: getEntriesByType as typeof performance.getEntriesByType,
+  getEntriesByName: getEntriesByName as typeof performance.getEntriesByName,
+  clearMarks: clearMarks as typeof performance.clearMarks,
+  clearMeasures: clearMeasures as typeof performance.clearMeasures,
+  clearResourceTimings: (() => {}) as typeof performance.clearResourceTimings,
+  setResourceTimingBufferSize:
+    (() => {}) as typeof performance.setResourceTimingBufferSize,
+  // Delegate read-only properties to the original
+  get timeOrigin() {
+    return original.timeOrigin
+  },
+  get onresourcetimingbufferfull() {
+    return (original as any).onresourcetimingbufferfull
+  },
+  set onresourcetimingbufferfull(_v: any) {
+    // no-op — prevent accumulation
+  },
+  toJSON() {
+    return original.toJSON()
+  },
+} as typeof performance
+
+/**
+ * Install the shim onto globalThis.performance. Safe to call multiple times.
+ * Must run before React and OTel import to prevent them from capturing the
+ * native Performance reference.
+ */
+export function installPerformanceShim(): void {
+  if ((globalThis as any).__performanceShimInstalled) return
+  ;(globalThis as any).__performanceShimInstalled = true
+  globalThis.performance = shim
+}
+
+// Auto-install on import
+installPerformanceShim()