stream: unify writableErrored and readableErrored

Both of these should always refer to the same error, hence
there is no reason to separate them.

PR-URL: #40799
Refs: #40696
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: ronag

doc/api/stream.md

@@ -633,7 +633,7 @@ added:
 Number of times [`writable.uncork()`][stream-uncork] needs to be
 called in order to fully uncork the stream.
 
-##### `writable.writableErrored`
+##### `writable.errored`
 
 <!-- YAML
 added:
@@ -1389,7 +1389,7 @@ added: v12.9.0
 
 Becomes `true` when [`'end'`][] event is emitted.
 
-##### `readable.readableErrored`
+##### `readable.errored`
 
 <!-- YAML
 added:

lib/internal/streams/readable.js

@@ -1242,7 +1242,7 @@ ObjectDefineProperties(Readable.prototype, {
     }
   },
 
-  readableErrored: {
+  errored: {
     enumerable: false,
     get() {
       return this._readableState ? this._readableState.errored : null;

lib/internal/streams/writable.js

@@ -858,7 +858,7 @@ ObjectDefineProperties(Writable.prototype, {
     }
   },
 
-  writableErrored: {
+  errored: {
     enumerable: false,
     get() {
       return this._writableState ? this._writableState.errored : null;

test/parallel/test-stream-finished.js

@@ -612,7 +612,7 @@ testClosed((opts) => new Writable({ write() {}, ...opts }));
   const w = new Writable();
   const _err = new Error();
   w.destroy(_err);
-  assert.strictEqual(w.writableErrored, _err);
+  assert.strictEqual(w.errored, _err);
   finished(w, common.mustCall((err) => {
     assert.strictEqual(_err, err);
     assert.strictEqual(w.closed, true);
@@ -625,7 +625,7 @@ testClosed((opts) => new Writable({ write() {}, ...opts }));
 {
   const w = new Writable();
   w.destroy();
-  assert.strictEqual(w.writableErrored, null);
+  assert.strictEqual(w.errored, null);
   finished(w, common.mustCall((err) => {
     assert.strictEqual(w.closed, true);
     assert.strictEqual(err.code, 'ERR_STREAM_PREMATURE_CLOSE');

test/parallel/test-stream-readable-destroy.js

@@ -13,7 +13,7 @@ const assert = require('assert');
   read.on('close', common.mustCall());
 
   read.destroy();
-  assert.strictEqual(read.readableErrored, null);
+  assert.strictEqual(read.errored, null);
   assert.strictEqual(read.destroyed, true);
 }
 
@@ -32,7 +32,7 @@ const assert = require('assert');
   }));
 
   read.destroy(expected);
-  assert.strictEqual(read.readableErrored, expected);
+  assert.strictEqual(read.errored, expected);
   assert.strictEqual(read.destroyed, true);
 }