Expand current syntax to support aliases for latest version (current/latest/node) (#483)

Author: panticmilos

.github/workflows/versions.yml

@@ -139,3 +139,34 @@ jobs:
       - name: Verify node
         run: __tests__/verify-arch.sh "ia32"
         shell: bash
+
+  node-latest-aliases:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        node-version: [current, latest, node]
+    steps:
+      - name: Get node version
+        run: |
+          latestNodeVersion=$(curl https://nodejs.org/dist/index.json | jq -r '. [0].version')
+          echo "::set-output name=LATEST_NODE_VERSION::$latestNodeVersion"
+        id: version
+        shell: bash
+      - uses: actions/checkout@v3
+      - name: Setup Node
+        uses: ./
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Retrieve version after install
+        run: |
+          updatedVersion=$(echo $(node --version))
+          echo "::set-output name=NODE_VERSION_UPDATED::$updatedVersion"
+        id: updatedVersion
+        shell: bash
+      - name: Compare versions
+        if: ${{ steps.version.outputs.LATEST_NODE_VERSION != steps.updatedVersion.outputs.NODE_VERSION_UPDATED}}
+        run: |
+          echo "Latest node version failed to download."
+          exit 1

README.md

@@ -40,6 +40,9 @@ The `node-version` input supports the following syntax:
 major versions: `12`, `14`, `16`
 more specific versions: `10.15`, `14.2.0`, `16.3.0`
 nvm lts syntax: `lts/erbium`, `lts/fermium`, `lts/*`
+latest release: `latest`/`current`/`node`
+
+**Note:** Since the latest release will not be cached always, there is possibility of hitting rate limit when downloading from dist
 
 ### Checking in lockfiles
 

__tests__/installer.test.ts

@@ -909,4 +909,30 @@ describe('setup-node', () => {
       );
     });
   });
+
+  describe('latest alias syntax', () => {
+    it.each(['latest', 'current', 'node'])(
+      'download the %s version if alias is provided',
+      async inputVersion => {
+        // Arrange
+        inputs['node-version'] = inputVersion;
+
+        os.platform = 'darwin';
+        os.arch = 'x64';
+
+        findSpy.mockImplementation(() => '');
+        getManifestSpy.mockImplementation(() => {
+          throw new Error('Unable to download manifest');
+        });
+
+        // Act
+        await main.run();
+
+        // assert
+        expect(logSpy).toHaveBeenCalledWith('Unable to download manifest');
+
+        expect(logSpy).toHaveBeenCalledWith('getting latest node version...');
+      }
+    );
+  });
 });

dist/setup/index.js

@@ -62587,6 +62587,12 @@ function queryDistForMatch(versionSpec, arch = os.arch()) {
         }
         let versions = [];
         let nodeVersions = yield getVersionsFromDist();
+        if (versionSpec === 'current' ||
+            versionSpec === 'latest' ||
+            versionSpec === 'node') {
+            core.info(`getting latest node version...`);
+            return nodeVersions[0].version;
+        }
         nodeVersions.forEach((nodeVersion) => {
             // ensure this version supports your os and platform
             if (nodeVersion.files.indexOf(dataFileName) >= 0) {

src/installer.ts

@@ -373,6 +373,15 @@ async function queryDistForMatch(
   let versions: string[] = [];
   let nodeVersions = await getVersionsFromDist();
 
+  if (
+    versionSpec === 'current' ||
+    versionSpec === 'latest' ||
+    versionSpec === 'node'
+  ) {
+    core.info(`getting latest node version...`);
+    return nodeVersions[0].version;
+  }
+
   nodeVersions.forEach((nodeVersion: INodeVersion) => {
     // ensure this version supports your os and platform
     if (nodeVersion.files.indexOf(dataFileName) >= 0) {