tty: make readStream.setRawMode() return this

PR-URL: nodejs#22950 Fixes: nodejs#22916 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Denys Otrishko <[email protected]>
Hailong · Sep 22, 2018 · 1f4d4c0 · 1f4d4c0
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diff --git a/doc/api/tty.md b/doc/api/tty.md
@@ -64,6 +64,7 @@ added: v0.7.7
   raw device. If `false`, configures the `tty.ReadStream` to operate in its
   default mode. The `readStream.isRaw` property will be set to the resulting
   mode.
+* Returns: {this} - the read stream instance.
 
 Allows configuration of `tty.ReadStream` so that it operates as a raw device.
 

diff --git a/lib/tty.js b/lib/tty.js
@@ -71,9 +71,10 @@ ReadStream.prototype.setRawMode = function(flag) {
   const err = this._handle.setRawMode(flag);
   if (err) {
     this.emit('error', errors.errnoException(err, 'setRawMode'));
-    return;
+    return this;
   }
   this.isRaw = flag;
+  return this;
 };
 
 function WriteStream(fd) {