fix(merge2): the package uses PassThrough stream (#40755)

types/merge2/index.d.ts

@@ -1,4 +1,4 @@
-// Type definitions for merge2 1.1
+// Type definitions for merge2 1.3
 // Project: https://github.com/teambition/merge2
 // Definitions by: Tanguy Krotoff <https://github.com/tkrotoff>
 //                 Chigozirim C. <https://github.com/smac89>
@@ -6,6 +6,8 @@
 
 /// <reference types="node" />
 
+import { PassThrough } from 'stream';
+
 /**
  * @summary        This function takes an arbitrary number of streams and returns a
  *                 Merge2Stream.
@@ -37,7 +39,7 @@ declare namespace merge2 {
         objectMode?: boolean;
     }
 
-    interface Merge2Stream extends NodeJS.ReadWriteStream {
+    interface Merge2Stream extends PassThrough {
         /**
          * @summary    Add more streams to an existing merged stream
          *

types/merge2/merge2-tests.ts

@@ -65,3 +65,6 @@ streamA.add(stream6);
 stream.on('readable', () => {
     console.log('Stream has data!!');
 });
+
+// should have PassThrough methods
+stream.destroy();