watch: add global debounce

Co-authored-by: Matthieu <matthieusieben@users.noreply.github.com>

Author: MoLow

lib/internal/watch_mode/files_watcher.js

@@ -6,6 +6,7 @@ const {
   SafeMap,
   SafeSet,
   StringPrototypeStartsWith,
+  Symbol,
 } = primordials;
 
 const { validateNumber, validateOneOf } = require('internal/validators');
@@ -21,6 +22,7 @@ const { setTimeout } = require('timers');
 const supportsRecursiveWatching = process.platform === 'win32' ||
   process.platform === 'darwin';
 
+const kGlobalDebounce = Symbol('kGlobalDebounce');
 class FilesWatcher extends EventEmitter {
   #watchers = new SafeMap();
   #filteredFiles = new SafeSet();
@@ -74,16 +76,17 @@ class FilesWatcher extends EventEmitter {
   }
 
   #onChange(trigger) {
-    if (this.#debouncing.has(trigger)) {
+    if (this.#debouncing.has(trigger) || this.#debouncing.has(kGlobalDebounce)) {
       return;
     }
     if (this.#mode === 'filter' && !this.#filteredFiles.has(trigger)) {
       return;
     }
-    this.#debouncing.add(trigger);
+    this.#debouncing.add(trigger).add(kGlobalDebounce);
     const owners = this.#depencencyOwners.get(trigger);
     setTimeout(() => {
       this.#debouncing.delete(trigger);
+      this.#debouncing.delete(kGlobalDebounce);
       this.emit('changed', { owners });
     }, this.#debounce).unref();
   }