Consolidate async docs away from old directories (#5771)

Contributes to #5766 and
#5767

Co-authored-by: Marya <111139605+MaryaBelanger@users.noreply.github.com>

firebase.json

@@ -37,7 +37,7 @@
       { "source": "/articles/await-async", "destination": "/codelabs/async-await", "type": 301 },
       { "source": "/articles/broadcast-streams", "destination": "https://medium.com/dartlang/dart-asynchronous-programming-streams-dab952023ed7", "type": 301 },
       { "source": "/articles/converters-and-codecs", "destination": "/articles/archive/converters-and-codecs", "type": 301 },
-      { "source": "/articles/creating-streams", "destination": "/articles/libraries/creating-streams", "type": 301 },
+      { "source": "/articles/creating-streams", "destination": "/libraries/async/creating-streams", "type": 301 },
       { "source": "/articles/dart-unit-tests{,/**}", "destination": "https://pub.dev/packages/test#writing-tests", "type": 301 },
       { "source": "/articles/dart-vm/io", "destination": "/articles/libraries/dart-io", "type": 301 },
       { "source": "/articles/dart-vm/native-extensions", "destination": "/server/c-interop-native-extensions", "type": 301 },
@@ -46,8 +46,8 @@
       { "source": "/articles/design-decisions/why-dart-types", "destination": "/resources/faq#types", "type": 301 },
       { "source": "/articles/doc-comment-guidelines", "destination": "/effective-dart/documentation", "type": 301 },
       { "source": "/articles/event-loop", "destination": "https://medium.com/dartlang/dart-asynchronous-programming-isolates-and-event-loops-bffc3e296a6a", "type": 301 },
-      { "source": "/articles/feet-wet-streams{,/**}", "destination": "/tutorials/language/streams", "type": 301 },
-      { "source": "/articles/futures-and-error-handling", "destination": "/guides/libraries/futures-error-handling", "type": 301 },
+      { "source": "/articles/feet-wet-streams{,/**}", "destination": "/libraries/async/using-streams", "type": 301 },
+      { "source": "/articles/futures-and-error-handling", "destination": "/libraries/async/futures-error-handling", "type": 301 },
       { "source": "/articles/idiomatic-dart{,/**}", "destination": "/effective-dart", "type": 301 },
       { "source": "/articles/io", "destination": "/articles/libraries/dart-io", "type": 301 },
       { "source": "/articles/js-dart-interop", "destination": "/web/libraries#js-interop", "type": 301 },
@@ -58,8 +58,10 @@
       { "source": "/articles/language/optional-types", "destination": "/resources/faq#types", "type": 301 },
       { "source": "/articles/libraries", "destination": "/libraries", "type": 301 },
       { "source": "/articles/libraries/converters-and-codecs", "destination": "/articles/archive/converters-and-codecs", "type": 301 },
+      { "source": "/articles/libraries/creating-streams", "destination": "/libraries/async/creating-streams", "type": 301 },
       { "source": "/articles/libraries/dart-io", "destination": "/libraries/dart-io", "type": 301 },
       { "source": "/articles/libraries/zones", "destination": "/articles/archive/zones", "type": 301 },
+      { "source": "/articles/libraries*{,/**}", "destination": "/libraries", "type": 301 },
       { "source": "/articles/m*{,/**}", "destination": "/guides/language/evolution", "type": 301 },
       { "source": "/articles/mixins", "destination": "/language/mixins", "type": 301 },
       { "source": "/articles/mocking-with-dart", "destination": "https://pub.dev/packages/mockito", "type": 301 },
@@ -132,7 +134,7 @@
       { "source": "/docs/tutorials/indexeddb{,/**}", "destination": "https://api.dart.dev/stable/dart-indexed_db/dart-indexed_db-library.html", "type": 301 },
       { "source": "/docs/tutorials/remove-elements", "destination": "/library/dart-html", "type": 301 },
       { "source": "/docs/tutorials/shared-pkgs", "destination": "/guides/packages", "type": 301 },
-      { "source": "/docs/tutorials/streams", "destination": "/tutorials/language/streams", "type": 301 },
+      { "source": "/docs/tutorials/streams", "destination": "/libraries/async/using-streams", "type": 301 },
       { "source": "/docs/tutorials{,/**}", "destination": "/tutorials", "type": 301 },
       { "source": "/docs{,/**}", "destination": "/guides", "type": 301 },
       { "source": "/downloads{,.html,/**}", "destination": "/get-dart", "type": 301 },
@@ -207,6 +209,7 @@
       { "source": "/guides/language/type-system", "destination": "/language/type-system", "type": 301 },
       { "source": "/guides/libraries", "destination": "/libraries", "type": 301 },
       { "source": "/guides/libraries/create-library-packages", "destination": "/guides/libraries/create-packages", "type": 301 },
+      { "source": "/guides/libraries/futures-error-handling", "destination": "/libraries/async/futures-error-handling", "type": 301 },
       { "source": "/guides/libraries/java-interop", "destination": "/interop/java-interop", "type": 301 },
       { "source": "/guides/libraries/objective-c-interop", "destination": "/interop/objective-c-interop", "type": 301 },
       { "source": "/guides/libraries/c-interop", "destination": "/interop/c-interop", "type": 301 },      
@@ -295,7 +298,9 @@
       { "source": "/tos@(|.htm|.html)", "destination": "/terms", "type": 301 },
       { "source": "/tutorials/dart-vm", "destination": "/tutorials/server", "type": 301 },
       { "source": "/tutorials/dart-vm/:page*", "destination": "/tutorials/server/:page*", "type": 301 },
+      { "source": "/tutorials/language", "destination": "/language", "type": 301 },
       { "source": "/tutorials/language/futures", "destination": "/codelabs/async-await", "type": 301 },
+      { "source": "/tutorials/language/streams", "destination": "/libraries/async/using-streams", "type": 301 },
       { "source": "/tutorials/libraries", "destination": "/libraries", "type": 301 },
       { "source": "/tutorials/libraries/shared-pkgs", "destination": "/guides/packages", "type": 301 },
       { "source": "/tutorials/web", "destination": "/web/get-started", "type": 301 },

src/_data/side-nav.yml

@@ -139,11 +139,11 @@
       permalink: /libraries/dart-html
     - divider
     - title: Using streams
-      permalink: /tutorials/language/streams
+      permalink: /libraries/async/using-streams
     - title: Creating streams
-      permalink: /articles/libraries/creating-streams
+      permalink: /libraries/async/creating-streams
     - title: Futures and error handling
-      permalink: /guides/libraries/futures-error-handling
+      permalink: /libraries/async/futures-error-handling
 
 - title: Effective Dart
   expanded: false

src/content/articles/archive/zones.md

@@ -27,7 +27,7 @@ This article discusses zone-related APIs in the [dart:async][] library,
 with a focus on the top-level [`runZoned()`][]
 and [`runZonedGuarded()`][] functions.
 Review the techniques covered in
-[Futures and Error Handling](/guides/libraries/futures-error-handling)
+[Futures and Error Handling](/libraries/async/futures-error-handling)
 before reading this article.
 
 [dart:async]: ({{site.dart-api}}/{{site.sdkInfo.channel}}/dart-async/dart-async-library.html)

src/content/guides/language/coming-from/swift-to-dart.md

@@ -2689,7 +2689,7 @@ You can also create a stream using the
 `StreamController` API. For more information,
 see [Using a StreamController][].
 
-[Using a StreamController]: /articles/libraries/creating-streams#using-a-streamcontroller
+[Using a StreamController]: /libraries/async/creating-streams#using-a-streamcontroller
 
 ## Doc comments
 

src/content/articles/libraries/creating-streams.md → src/content/libraries/async/creating-streams.md

@@ -36,7 +36,7 @@ This article shows the code for each approach
 and gives tips to help you implement your stream correctly.
 
 For help on using streams, see
-[Asynchronous Programming: Streams](/tutorials/language/streams).
+[Asynchronous Programming: Streams](/libraries/async/using-streams).
 
 
 ## Transforming an existing stream

src/content/tutorials/language/streams.md → src/content/libraries/async/using-streams.md

@@ -391,9 +391,9 @@ error event, and when the stream is closed.
 Read the following documentation for more details on using streams
 and asynchronous programming in Dart.
 
-* [Creating Streams in Dart](/articles/libraries/creating-streams),
+* [Creating Streams in Dart](/libraries/async/creating-streams),
   an article about creating your own streams
-* [Futures and Error Handling](/guides/libraries/futures-error-handling),
+* [Futures and Error Handling](/libraries/async/futures-error-handling),
   an article that explains how to handle errors using the Future API
 * [Asynchrony support](/language/async),
   a section in the [language tour](/language)

src/content/libraries/dart-async.md

@@ -456,9 +456,9 @@ check out the [dart:io documentation][].
 Also see these articles, codelabs, and tutorials:
 
 - [Asynchronous programming: futures, async, await](/codelabs/async-await)
-- [Futures and error handling](/guides/libraries/futures-error-handling)
+- [Futures and error handling](/libraries/async/futures-error-handling)
 - [Asynchronous programming: streams](/tutorials/language/streams)
-- [Creating streams in Dart](/articles/libraries/creating-streams)
+- [Creating streams in Dart](/libraries/async/creating-streams)
 - [Dart asynchronous programming: Isolates and event loops](/language/concurrency)
 
 

src/content/tutorials/index.md

@@ -22,7 +22,7 @@ which are fundamental to most Dart programs.
 
 <div class="card-grid no_toc_section">
   <div class="card">
-    <h3><a href="/tutorials/language/streams">Asynchronous programming:
+    <h3><a href="/libraries/async/using-streams">Asynchronous programming:
        streams</a></h3>
     <p>Use streams to manage sequences of data.</p>
   </div>