perf: flush compile cache after 10s (#19537)

Author: sapphi-red

packages/vite/bin/vite.js

@@ -49,6 +49,15 @@ function start() {
   try {
     // eslint-disable-next-line n/no-unsupported-features/node-builtins -- it is supported in Node 22.8.0+ and only called if it exists
     module.enableCompileCache?.()
+    // flush the cache after 10s because the cache is not flushed until process end
+    // for dev server, the cache is never flushed unless manually flushed because the process.exit is called
+    // also flushing the cache in SIGINT handler seems to cause the process to hang
+    setTimeout(() => {
+      try {
+        // eslint-disable-next-line n/no-unsupported-features/node-builtins -- it is supported in Node 22.12.0+ and only called if it exists
+        module.flushCompileCache?.()
+      } catch {}
+    }, 10 * 1000).unref()
   } catch {}
   return import('../dist/node/cli.js')
 }