lib: migrate _http_outgoing.js's remaining errors

A couple of lib/_http_outgoing.js's errors were still in the
"old style": `throw new Error(<some message here>)`.

This commit migrates those 2 old style errors to the "new style":
internal/errors.js's error-system.

In the future, changes to these errors' messages won't break
semver-major status. With the old style, changes to these errors'
messages broke semver-major status. It was inconvenient.

Refs: https://github.com/nodejs/node/issues/17709
PR-URL: https://github.com/nodejs/node/pull/17837
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/_http_outgoing.js b/lib/_http_outgoing.js
index 07cf84866f..324373f385 100644
--- a/lib/_http_outgoing.js
+++ b/lib/_http_outgoing.js
@@ -629,7 +629,7 @@ OutgoingMessage.prototype.write = function write(chunk, encoding, callback) {
 
 function write_(msg, chunk, encoding, callback, fromEnd) {
   if (msg.finished) {
-    var err = new Error('write after end');
+    const err = new errors.Error('ERR_STREAM_WRITE_AFTER_END');
     nextTick(msg.socket && msg.socket[async_id_symbol],
              writeAfterEndNT.bind(msg),
              err,
@@ -880,7 +880,7 @@ OutgoingMessage.prototype.flush = internalUtil.deprecate(function() {
 
 OutgoingMessage.prototype.pipe = function pipe() {
   // OutgoingMessage should be write-only. Piping from it is disabled.
-  this.emit('error', new Error('Cannot pipe, not readable'));
+  this.emit('error', new errors.Error('ERR_STREAM_CANNOT_PIPE'));
 };
 
 module.exports = {