stream: fix misleading error message

The method to implement is `_write` not `_transform`. PR-URL: #18604 Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Anatoli Papirovski <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Matteo Collina <[email protected]>

Author: lpinca

lib/_stream_writable.js

@@ -551,7 +551,7 @@ function clearBuffer(stream, state){
 }
 
 Writable.prototype._write=function(chunk,encoding,cb){
-cb(newerrors.Error('ERR_METHOD_NOT_IMPLEMENTED','_transform'));
+cb(newerrors.Error('ERR_METHOD_NOT_IMPLEMENTED','_write'));
 };
 
 Writable.prototype._writev=null;

test/parallel/test-stream-writable-constructor-set-methods.js

@@ -1,5 +1,5 @@
 'use strict';
-require('../common');
+constcommon=require('../common');
 constassert=require('assert');
 
 constWritable=require('stream').Writable;
@@ -26,6 +26,16 @@ w2.write(Buffer.from('blerg'));
 w2.write(Buffer.from('blerg'));
 w2.end();
 
+constw3=newWritable();
+
+w3.on('error',common.expectsError({
+type: Error,
+code: 'ERR_METHOD_NOT_IMPLEMENTED',
+message: 'The _write method is not implemented'
+}));
+
+w3.end(Buffer.from('blerg'));
+
 process.on('exit',function(){
 assert.strictEqual(w._write,_write);
 assert(_writeCalled);