util: prepend '(node) ' to deprecation messages

Changes included in this commit are

   1. Making the deprecation messages consistent. The messages will be in
      the following format

           x is deprecated. Use y instead.

      If there is no alternative for `x`, then the ` Use y instead.` part
      will not be there in the message.

   2. All the internal deprecation messages are printed with the prefix
      `(node) `, except when the `--trace-deprecation` flag is set.

Fixes: https://github.com/nodejs/io.js/issues/1883
PR-URL: https://github.com/nodejs/io.js/pull/1892
Reviewed-By: Roman Reiss <me@silverwind.io>

1 files changed, 4 insertions, 3 deletions

diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index 5b374688b0..19c0c8a006 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -8,6 +8,7 @@ module.exports = Writable;
 Writable.WritableState = WritableState;
 
 const util = require('util');
+const internalUtil = require('internal/util');
 const Stream = require('stream');
 const Buffer = require('buffer').Buffer;
 
@@ -120,10 +121,10 @@ WritableState.prototype.getBuffer = function writableStateGetBuffer() {
 };
 
 Object.defineProperty(WritableState.prototype, 'buffer', {
-  get: util.deprecate(function() {
+  get: internalUtil.deprecate(function() {
     return this.getBuffer();
-  }, '_writableState.buffer is deprecated. Use ' +
-      '_writableState.getBuffer() instead.')
+  }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' +
+     'instead.')
 });
 
 function Writable(options) {