Fix memory leak in dev server

dist/functions/server/watcher-esbuild-ctx.d.ts

@@ -5,10 +5,12 @@
  */
 export declare function restartWatcher(): void;
 /**
- * True when the watcher was last (re)created long enough ago that the
- * watchdog should consider re-creating it again.
+ * Called periodically by the dev server. Re-creates the watcher only when it
+ * failed to report the probe written on the previous tick, i.e. when it went
+ * stale. A healthy watcher is left alone: re-creating it rescans the whole
+ * project tree.
  */
-export declare function watcherRestartAvailable(): boolean;
+export declare function watcherWatchdogTick(): void;
 export default function watcherEsbuildCTX(params?: {
     pages_snapshot?: string;
 }): Promise<void>;