doc: add class worker documentation

yoshimoto8 · refack · commit 5b12fe04ba9a · 2019-01-10T10:04:03.000-05:00
Add documentation about Worker class inherits from EventEmitter. PR-URL: nodejs#24849 Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
diff --git a/doc/api/worker_threads.md b/doc/api/worker_threads.md
@@ -234,6 +234,8 @@ listeners for the event exist.
 added: v10.5.0
 -->
 
+* Extends: {EventEmitter}
+
 The `Worker` class represents an independent JavaScript execution thread.
 Most Node.js APIs are available inside of it.
 
