Update.

example/fswatch_demo.wren

@@ -0,0 +1,54 @@
+// retoor <retoor@molodetz.nl>
+
+import "fswatch" for FileWatcher, FsEvent
+import "timer" for Timer
+import "io" for File, FileFlags
+
+System.print("=== FSWatch Module Demo ===\n")
+
+var testFile = "/tmp/fswatch_demo.txt"
+
+System.print("--- Setting up test file ---")
+var f = File.openWithFlags(testFile, FileFlags.writeOnly | FileFlags.create | FileFlags.truncate)
+f.writeBytes("initial content", 0)
+f.close()
+System.print("Created test file: %(testFile)")
+
+System.print("\n--- Starting file watcher ---")
+var watcher = FileWatcher.new(testFile)
+var eventCount = 0
+
+watcher.start { |event|
+    eventCount = eventCount + 1
+    System.print("Event %(eventCount):")
+    System.print("  Filename: %(event.filename)")
+    System.print("  Is rename: %(event.isRename)")
+    System.print("  Is change: %(event.isChange)")
+}
+
+System.print("Watcher active: %(watcher.isActive)")
+
+System.print("\n--- Modifying file ---")
+
+Timer.immediate {
+    var f2 = File.openWithFlags(testFile, FileFlags.writeOnly | FileFlags.truncate)
+    f2.writeBytes("first modification", 0)
+    f2.close()
+    System.print("Made first modification")
+}
+
+Timer.sleep(150)
+
+Timer.immediate {
+    var f3 = File.openWithFlags(testFile, FileFlags.writeOnly | FileFlags.truncate)
+    f3.writeBytes("second modification", 0)
+    f3.close()
+    System.print("Made second modification")
+}
+
+Timer.sleep(150)
+
+System.print("\n--- Stopping watcher ---")
+watcher.stop()
+System.print("Watcher active: %(watcher.isActive)")
+System.print("Total events received: %(eventCount)")