Squashed commit of the following:

commit 446068aff1ec25da69c5b6af6d01dd19b230b4b2
Author: Alena Sviridenko <alenasviridenko@github.com>
Date:   Tue Jun 22 17:51:35 2021 +0300

    updated headers

commit d7e254e6e9534bb627373b7e40400cc45a888815
Author: Alena Sviridenko <alenasviridenko@github.com>
Date:   Thu Jun 17 17:35:34 2021 +0300

    updated links

commit ffd9956eda8c43e846f3305bad21fa064b07280f
Author: AlyonaSviridenko <alenasviridenko@github.com>
Date:   Thu Jun 17 17:33:41 2021 +0300

    Added advanced usage

commit 1e068f031030962d380a1bae32beb806d1c6f818
Author: AlyonaSviridenko <alenasviridenko@github.com>
Date:   Thu Jun 17 15:07:42 2021 +0300

    Updated readme with caching

commit 7528c3399a9c8e0b4e63f7a079e0078af6b92d6a
Author: Maxim Lobanov <v-malob@microsoft.com>
Date:   Wed Jun 16 14:43:46 2021 +0300

    Update versions.yml

.github/workflows/versions.yml

@@ -6,7 +6,7 @@ on:
       - '**.md'    
   push:    
     branches:
-      - main
+      - main  
       - releases/*
     paths-ignore:
       - '**.md'

README.md

@@ -4,33 +4,18 @@
   <a href="https://github.com/actions/setup-node/actions?query=workflow%3Abuild-test"><img alt="build-test status" src="https://github.com/actions/setup-node/workflows/build-test/badge.svg"></a> <a href="https://github.com/actions/setup-node/actions?query=workflow%3Aversions"><img alt="versions status" src="https://github.com/actions/setup-node/workflows/versions/badge.svg"></a> <a href="https://github.com/actions/setup-node/actions?query=workflow%3Aproxy"><img alt="proxy status" src="https://github.com/actions/setup-node/workflows/proxy/badge.svg"></a> 
 </p>
 
-This action sets by node environment for use in actions by:
+This action provides the following functionality for GitHub Actions runners:
 
-- optionally downloading and caching a version of node - npm by version spec and add to PATH
+- Optionally downloading and caching distribution of the requested Node.js version, and adding it to the PATH
-- registering problem matchers for error output
+- Optionally caching npm/yarn dependencies
-- configuring authentication for GPR or npm
+- Registering problem matchers for error output
-
+- Configuring authentication for GPR or npm
-# v2
-
-This release adds reliability for pulling node distributions from a cache of node releases.
-
-```yaml
-steps:
-- uses: actions/checkout@v2
-- uses: actions/setup-node@v2
-  with:
-    node-version: '14'
-```
-
-The action will first check the local cache for a semver match. The hosted images have been updated with the latest of each LTS from v8, v10, v12, and v14. `self-hosted` machines will benefit from the cache as well only downloading once. The action will pull LTS versions from [node-versions releases](https://github.com/actions/node-versions/releases) and on miss or failure will fall back to the previous behavior of downloading directly from [node dist](https://nodejs.org/dist/).
-
-The `node-version` input is optional. If not supplied, the node version that is PATH will be used. However, this action will still register problem matchers and support auth features. So setting up the node environment is still a valid scenario without downloading and caching versions.
 
 # Usage
 
 See [action.yml](action.yml)
 
-Basic:
+**Basic:**
 ```yaml
 steps:
 - uses: actions/checkout@v2
@@ -41,13 +26,15 @@ steps:
 - run: npm test
 ```
 
-Check latest version:
+The `node-version` input is optional. If not supplied, the node version from PATH will be used. However, this action will still register problem matchers and support auth features. So setting up the node environment is still a valid scenario without downloading and caching versions.
 
-In the basic example above, the `check-latest` flag defaults to `false`. When set to `false`, the action tries to first resolve a version of node from the local cache. For information regarding locally cached versions of Node on GitHub hosted runners, check out [GitHub Actions Virtual Environments](https://github.com/actions/virtual-environments). The local version of Node in cache gets updated every couple of weeks. If unable to find a specific version in the cache, the action will then attempt to download a version of Node. Use the default or set `check-latest` to `false` if you prefer stability and if you want to ensure a specific version of Node is always used.
+The action will first check the local cache for a semver match. If unable to find a specific version in the cache, the action will attempt to download a version of Node.js. It will pull LTS versions from [node-versions releases](https://github.com/actions/node-versions/releases) and on miss or failure will fall back to the previous behavior of downloading directly from [node dist](https://nodejs.org/dist/).
 
-If `check-latest` is set to `true`, the action first checks if the cached version is the latest one. If the locally cached version is not the most up-to-date, a version of Node will then be downloaded. Set `check-latest` to `true` it you want the most up-to-date version of Node to always be used.
+For information regarding locally cached versions of Node.js on GitHub hosted runners, check out [GitHub Actions Virtual Environments](https://github.com/actions/virtual-environments).
 
-> Setting `check-latest` to `true` has performance implications as downloading versions of Node is slower than using cached versions
+### Caching packages dependencies
+
+The action has a built-in functionality for caching and restoring npm/yarn dependencies. Supported package managers are `npm`, `yarn`. The `cache` input is optional, and caching is turned off by default.
 
 ```yaml
 steps:
@@ -55,16 +42,31 @@ steps:
 - uses: actions/setup-node@v2
   with:
     node-version: '14'
-    check-latest: true
+    cache: 'npm'
 - run: npm install
 - run: npm test
 ```
 
-Matrix Testing:
+**Caching yarn dependencies:**
+```yaml
+steps:
+- uses: actions/checkout@v2
+- uses: actions/setup-node@v2
+  with:
+    node-version: '14'
+    cache: 'yarn'
+- run: npm install
+- run: npm test
+```
+Yarn caching handles both yarn versions: 1 or 2. 
+
+> At the moment, only `lock` files in the project root are supported.
+
+### Matrix Testing:
 ```yaml
 jobs:
   build:
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         node: [ '12', '14' ]
@@ -78,119 +80,14 @@ jobs:
       - run: npm install
       - run: npm test
 ```
+## Advanced usage
 
-Architecture:
+1. [Check latest version](docs/advanced-usage.md#check-latest-version)
-
+2. [Using different architectures](docs/advanced-usage.md#architecture)
-You can use any of the [supported operating systems](https://docs.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners), and the compatible `architecture` can be selected using `architecture`. Values are `x86`, `x64`, `arm64`, `armv6l`, `armv7l`, `ppc64le`, `s390x` (not all of the architectures are available on all platforms).
+3. [Using multiple operating systems and architectures](docs/advanced-usage.md#multiple-operating-systems-and-architectures)
-
+4. [Publishing to npmjs and GPR with npm](docs/advanced-usage.md#publish-to-npmjs-and-gpr-with-npm)
-When using `architecture`, `node-version` must be provided as well.
+5. [Publishing to npmjs and GPR with yarn](docs/advanced-usage.md#publish-to-npmjs-and-gpr-with-yarn)
-```yaml
+6. [Using private packages](docs/advanced-usage.md#use-private-packages)
-jobs:
-  build:
-    runs-on: windows-latest
-    name: Node sample
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2
-        with:
-          node-version: '14'
-          architecture: 'x64' # optional, x64 or x86. If not specified, x64 will be used by default
-      - run: npm install
-      - run: npm test
-```
-
-Multiple Operating Systems and Architectures:
-
-```yaml
-jobs:
-  build:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os:
-          - ubuntu-latest
-          - macos-latest
-          - windows-latest
-        node_version:
-          - 10
-          - 12
-          - 14
-        architecture:
-          - x64
-        # an extra windows-x86 run:
-        include:
-          - os: windows-2016
-            node_version: 12
-            architecture: x86
-    name: Node ${{ matrix.node_version }} - ${{ matrix.architecture }} on ${{ matrix.os }}
-    steps:
-      - uses: actions/checkout@v2
-      - name: Setup node
-        uses: actions/setup-node@v2
-        with:
-          node-version: ${{ matrix.node_version }}
-          architecture: ${{ matrix.architecture }}
-      - run: npm install
-      - run: npm test
-```
-
-Publish to npmjs and GPR with npm:
-```yaml
-steps:
-- uses: actions/checkout@v2
-- uses: actions/setup-node@v2
-  with:
-    node-version: '10.x'
-    registry-url: 'https://registry.npmjs.org'
-- run: npm install
-- run: npm publish
-  env:
-    NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
-- uses: actions/setup-node@v2
-  with:
-    registry-url: 'https://npm.pkg.github.com'
-- run: npm publish
-  env:
-    NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-```
-
-Publish to npmjs and GPR with yarn:
-```yaml
-steps:
-- uses: actions/checkout@v2
-- uses: actions/setup-node@v2
-  with:
-    node-version: '10.x'
-    registry-url: <registry url>
-- run: yarn install
-- run: yarn publish
-  env:
-    NODE_AUTH_TOKEN: ${{ secrets.YARN_TOKEN }}
-- uses: actions/setup-node@v2
-  with:
-    registry-url: 'https://npm.pkg.github.com'
-- run: yarn publish
-  env:
-    NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-```
-
-Use private packages:
-```yaml
-steps:
-- uses: actions/checkout@v2
-- uses: actions/setup-node@v2
-  with:
-    node-version: '10.x'
-    registry-url: 'https://registry.npmjs.org'
-# Skip post-install scripts here, as a malicious
-# script could steal NODE_AUTH_TOKEN.
-- run: npm install --ignore-scripts
-  env:
-    NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
-# `npm rebuild` will run all those post-install scripts for us.
-- run: npm rebuild && npm run prepare --if-present
-```
-
 
 # License
 

docs/advanced-usage.md

@@ -0,0 +1,132 @@
+# Advanced usage
+
+### Check latest version:
+
+The `check-latest` flag defaults to `false`. When set to `false`, the action will first check the local cache for a semver match. If unable to find a specific version in the cache, the action will attempt to download a version of Node.js. It will pull LTS versions from [node-versions releases](https://github.com/actions/node-versions/releases) and on miss or failure will fall back to the previous behavior of downloading directly from [node dist](https://nodejs.org/dist/). Use the default or set `check-latest` to `false` if you prefer stability and if you want to ensure a specific version of Node.js is always used.
+
+If `check-latest` is set to `true`, the action first checks if the cached version is the latest one. If the locally cached version is not the most up-to-date, a version of Node.js will then be downloaded. Set `check-latest` to `true` it you want the most up-to-date version of Node.js to always be used.
+
+> Setting `check-latest` to `true` has performance implications as downloading versions of Node is slower than using cached versions.
+
+```yaml
+steps:
+- uses: actions/checkout@v2
+- uses: actions/setup-node@v2
+  with:
+    node-version: '14'
+    check-latest: true
+- run: npm install
+- run: npm test
+```
+
+### Architecture:
+
+You can use any of the [supported operating systems](https://docs.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners), and the compatible `architecture` can be selected using `architecture`. Values are `x86`, `x64`, `arm64`, `armv6l`, `armv7l`, `ppc64le`, `s390x` (not all of the architectures are available on all platforms).
+
+When using `architecture`, `node-version` must be provided as well.
+```yaml
+jobs:
+  build:
+    runs-on: windows-latest
+    name: Node sample
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: '14'
+          architecture: 'x64' # optional, x64 or x86. If not specified, x64 will be used by default
+      - run: npm install
+      - run: npm test
+```
+
+### Multiple Operating Systems and Architectures:
+
+```yaml
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        node_version:
+          - 10
+          - 12
+          - 14
+        architecture:
+          - x64
+        # an extra windows-x86 run:
+        include:
+          - os: windows-2016
+            node_version: 12
+            architecture: x86
+    name: Node ${{ matrix.node_version }} - ${{ matrix.architecture }} on ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup node
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node_version }}
+          architecture: ${{ matrix.architecture }}
+      - run: npm install
+      - run: npm test
+```
+
+### Publish to npmjs and GPR with npm:
+```yaml
+steps:
+- uses: actions/checkout@v2
+- uses: actions/setup-node@v2
+  with:
+    node-version: '14.x'
+    registry-url: 'https://registry.npmjs.org'
+- run: npm install
+- run: npm publish
+  env:
+    NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+- uses: actions/setup-node@v2
+  with:
+    registry-url: 'https://npm.pkg.github.com'
+- run: npm publish
+  env:
+    NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```
+
+### Publish to npmjs and GPR with yarn:
+```yaml
+steps:
+- uses: actions/checkout@v2
+- uses: actions/setup-node@v2
+  with:
+    node-version: '14.x'
+    registry-url: <registry url>
+- run: yarn install
+- run: yarn publish
+  env:
+    NODE_AUTH_TOKEN: ${{ secrets.YARN_TOKEN }}
+- uses: actions/setup-node@v2
+  with:
+    registry-url: 'https://npm.pkg.github.com'
+- run: yarn publish
+  env:
+    NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```
+
+### Use private packages:
+```yaml
+steps:
+- uses: actions/checkout@v2
+- uses: actions/setup-node@v2
+  with:
+    node-version: '14.x'
+    registry-url: 'https://registry.npmjs.org'
+# Skip post-install scripts here, as a malicious
+# script could steal NODE_AUTH_TOKEN.
+- run: npm install --ignore-scripts
+  env:
+    NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+# `npm rebuild` will run all those post-install scripts for us.
+- run: npm rebuild && npm run prepare --if-present
+```