feat: add volta as node-version-file

__tests__/data/package.json

@@ -1,5 +1,8 @@
 {
   "engines": {
     "node": ">=14.0.0"
+  },
+  "volta": {
+    "node": "14.0.0"
   }
 }

__tests__/installer.test.ts

@@ -579,6 +579,7 @@ describe('setup-node', () => {
       existsSpy.mockImplementationOnce(
         input => input === path.join(__dirname, 'data', versionFile)
       );
+
       // Act
       await main.run();
 

dist/setup/index.js

@@ -71768,15 +71768,16 @@ function translateArchToDistUrl(arch) {
     }
 }
 function parseNodeVersionFile(contents) {
-    var _a, _b;
+    var _a, _b, _c;
     let nodeVersion;
     const found = contents.match(/^(?:nodejs\s+)?v?(?<version>[^\s]+)$/m);
     nodeVersion = (_a = found === null || found === void 0 ? void 0 : found.groups) === null || _a === void 0 ? void 0 : _a.version;
     if (!nodeVersion) {
         try {
-            // Try parsing the file as an NPM `package.json`
-            // file.
-            nodeVersion = (_b = JSON.parse(contents).engines) === null || _b === void 0 ? void 0 : _b.node;
+            // Try parsing the file as an NPM `package.json` file.
+            nodeVersion = (_b = JSON.parse(contents).volta) === null || _b === void 0 ? void 0 : _b.node;
+            if (!nodeVersion)
+                nodeVersion = (_c = JSON.parse(contents).engines) === null || _c === void 0 ? void 0 : _c.node;
             if (!nodeVersion)
                 throw new Error();
         }

docs/advanced-usage.md

@@ -58,6 +58,7 @@ steps:
 
 The `node-version-file` input accepts a path to a file containing the version of Node.js to be used by a project, for example `.nvmrc`, `.node-version` or `.tool-versions`. If both the `node-version` and the `node-version-file` inputs are provided then the `node-version` input is used.
 See [supported version syntax](https://github.com/actions/setup-node#supported-version-syntax)
+
 > The action will search for the node version file relative to the repository root.
 
 ```yaml

src/installer.ts

@@ -502,10 +502,9 @@ export function parseNodeVersionFile(contents: string): string {
 
   if (!nodeVersion) {
     try {
-      // Try parsing the file as an NPM `package.json`
-      // file.
-      nodeVersion = JSON.parse(contents).engines?.node;
-
+      // Try parsing the file as an NPM `package.json` file.
+      nodeVersion = JSON.parse(contents).volta?.node;
+      if (!nodeVersion) nodeVersion = JSON.parse(contents).engines?.node;
       if (!nodeVersion) throw new Error();
     } catch (err) {
       // In the case of an unknown format,

src/main.ts

@@ -95,14 +95,17 @@ function resolveVersionInput(): string {
       process.env.GITHUB_WORKSPACE!,
       versionFileInput
     );
+
     if (!fs.existsSync(versionFilePath)) {
       throw new Error(
         `The specified node version file at: ${versionFilePath} does not exist`
       );
     }
+
     version = installer.parseNodeVersionFile(
       fs.readFileSync(versionFilePath, 'utf8')
     );
+
     core.info(`Resolved ${versionFileInput} as ${version}`);
   }
 

tsconfig.json

@@ -6,7 +6,7 @@
     "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
     "sourceMap": true,
     "strict": true,                           /* Enable all strict type-checking options. */
-    "noImplicitAny": false,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    "noImplicitAny": false,                   /* Raise error on expressions and declarations with an implied 'any' type. */
     "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
   },
   "exclude": ["__tests__", "lib", "node_modules"]