feat: relax js-toml version

* update documentation for lockfile

* Update adavance usage in README.md

* Documentation update

* Update lockfile documenation

* fix coplilot suggestion

.github/workflows/e2e-cache.yml

@@ -21,7 +21,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20, 22, 24]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Clean global cache
         run: npm cache clean --force
       - name: Setup Node
@@ -44,7 +44,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20, 22, 24]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install pnpm
         uses: pnpm/action-setup@v4
         with:
@@ -77,7 +77,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20, 22, 24]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Yarn version
         run: yarn --version
       - name: Generate yarn file
@@ -109,7 +109,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20, 22, 24]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Update yarn
         run: yarn set version 3.6.4
       - name: Yarn version
@@ -143,7 +143,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: prepare sub-projects
         run: __tests__/prepare-yarn-subprojects.sh yarn1
@@ -170,7 +170,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: prepare sub-projects
         run: __tests__/prepare-yarn-subprojects.sh keepcache keepcache
@@ -197,7 +197,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: prepare sub-projects
         run: __tests__/prepare-yarn-subprojects.sh global
@@ -224,7 +224,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: prepare sub-projects
         run: /bin/bash __tests__/prepare-yarn-subprojects.sh keepcache
@@ -253,7 +253,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20, 22, 24]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Create package.json with packageManager field
         run: |
           echo '{ "name": "test-project", "version": "1.0.0", "packageManager": "npm@8.0.0" }' > package.json
@@ -278,7 +278,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20, 22, 24]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Create package.json with devEngines field
         run: |
           echo '{

.github/workflows/proxy.yml

@@ -25,7 +25,7 @@ jobs:
     env:
       https_proxy: http://squid-proxy:3128
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Clear tool cache
         run: rm -rf $RUNNER_TOOL_CACHE/*
       - name: Setup node 24
@@ -41,7 +41,7 @@ jobs:
       https_proxy: http://no-such-proxy:3128
       no_proxy: api.github.com,github.com,nodejs.org,registry.npmjs.org,*.s3.amazonaws.com,s3.amazonaws.com
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Clear tool cache
         run: rm -rf $RUNNER_TOOL_CACHE/*
       - name: Setup node 24

.github/workflows/publish-immutable-actions.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Checking out
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Publish
         id: publish
         uses: actions/publish-immutable-action@v0.0.4

.github/workflows/versions.yml

@@ -20,7 +20,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20, 22, 24]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node
         uses: ./
         with:
@@ -37,7 +37,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest-large]
         node-version: [lts/dubnium, lts/erbium, lts/fermium, lts/*, lts/-1]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node
         uses: ./
         with:
@@ -64,7 +64,7 @@ jobs:
             '20.0.0-v8-canary20221101e50e45c9f8'
           ]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node
         uses: ./
         with:
@@ -84,7 +84,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20-nightly, 25-nightly, 24.0.0-nightly]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node
         uses: ./
         with:
@@ -104,7 +104,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20.0.0-rc.1, 22.14.0-rc.1, 24.0.0-rc.4]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node
         uses: ./
         with:
@@ -124,7 +124,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20.10.0, 22.0.0, 24.9.0]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node
         uses: ./
         with:
@@ -141,7 +141,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [20, 22, 24]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node and check latest
         uses: ./
         with:
@@ -160,7 +160,7 @@ jobs:
         node-version-file:
           [.nvmrc, .tool-versions, .tool-versions-node, package.json]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup node from node version file
         uses: ./
         with:
@@ -175,7 +175,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup node from node version file
         uses: ./
         with:
@@ -190,7 +190,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup node from node version file
         uses: ./
         with:
@@ -206,7 +206,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest, macos-latest-large]
         node-version: [17, 19]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node from dist
         uses: ./
         with:
@@ -222,7 +222,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest-large]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       # test old versions which didn't have npm and layout different
       - name: Setup node 0.12.18 from dist
         uses: ./
@@ -235,7 +235,7 @@ jobs:
   arch:
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup node 20 x86 from dist
         uses: ./
         with:
@@ -259,7 +259,7 @@ jobs:
           echo "LATEST_NODE_VERSION=$latestNodeVersion" >> $GITHUB_OUTPUT
         id: version
         shell: bash
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup Node
         uses: ./
         with:

README.md

@@ -16,7 +16,9 @@ This action provides the following functionality for GitHub Actions users:
 
 - Caching is now automatically enabled for npm projects when either the `devEngines.packageManager` field or the top-level `packageManager` field in `package.json` is set to `npm`. For other package managers, such as Yarn and pnpm, caching is disabled by default and must be configured manually using the `cache` input.
 
-## Breaking changes in V5 
+- The `always-auth` input has been removed, as it is deprecated and will no longer be supported in future npm releases. To ensure your workflows continue to run without warnings or errors, please remove any references to `always-auth` from your configuration.
+
+## Breaking changes in V5
 
 - Enabled caching by default with package manager detection if no cache input is provided.
   > For workflows with elevated privileges or access to sensitive information, we recommend disabling automatic caching by setting `package-manager-cache: false` when caching is not needed for secure operation.
@@ -39,23 +41,23 @@ See [action.yml](action.yml)
     # Examples: 12.x, 10.15.1, >=10.15.0, lts/Hydrogen, 16-nightly, latest, node
     node-version: ''
 
-    # File containing the version Spec of the version to use.  Examples: package.json, .nvmrc, .node-version, .tool-versions.
-    # If node-version and node-version-file are both provided the action will use version from node-version. 
+    # File containing the version Spec of the version to use.  Examples: package.json, mise.toml, .nvmrc, .node-version, .tool-versions.
+    # If node-version and node-version-file are both provided the action will use version from node-version.
     node-version-file: ''
 
-    # Set this option if you want the action to check for the latest available version 
+    # Set this option if you want the action to check for the latest available version
     # that satisfies the version spec.
-    # It will only get affect for lts Nodejs versions (12.x, >=10.15.0, lts/Hydrogen). 
+    # It will only get affect for lts Nodejs versions (12.x, >=10.15.0, lts/Hydrogen).
     # Default: false
     check-latest: false
 
     # Target architecture for Node to use. Examples: x86, x64. Will use system architecture by default.
-    # Default: ''. The action use system architecture by default 
+    # Default: ''. The action use system architecture by default
     architecture: ''
 
-    # Used to pull node distributions from https://github.com/actions/node-versions. 
-    # Since there's a default, this is typically not supplied by the user. 
-    # When running this action on github.com, the default value is sufficient. 
+    # Used to pull node distributions from https://github.com/actions/node-versions.
+    # Since there's a default, this is typically not supplied by the user.
+    # When running this action on github.com, the default value is sufficient.
     # When running on GHES, you can pass a personal access token for github.com if you are experiencing rate limiting.
     #
     # We recommend using a service account with the least permissions necessary. Also
@@ -76,26 +78,22 @@ See [action.yml](action.yml)
     # default: true
     package-manager-cache: true
 
-    # Used to specify the path to a dependency file: package-lock.json, yarn.lock, etc. 
-    # It will generate hash from the target file for primary key. It works only If cache is specified.  
+    # Used to specify the path to a dependency file: package-lock.json, yarn.lock, etc.
+    # It will generate hash from the target file for primary key. It works only If cache is specified.
     # Supports wildcards or a list of file names for caching multiple dependencies.
     # Default: ''
     cache-dependency-path: ''
 
-    # Optional registry to set up for auth. Will set the registry in a project level .npmrc and .yarnrc file, 
+    # Optional registry to set up for auth. Will set the registry in a project level .npmrc and .yarnrc file,
     # and set up auth to read in from env.NODE_AUTH_TOKEN.
     # Default: ''
     registry-url: ''
 
-    # Optional scope for authenticating against scoped registries. 
+    # Optional scope for authenticating against scoped registries.
     # Will fall back to the repository owner when using the GitHub Packages registry (https://npm.pkg.github.com/).
     # Default: ''
     scope: ''
 
-    # Set always-auth option in npmrc file.
-    # Default: ''
-    always-auth: ''
-
     # Optional mirror to download binaries from.
     # Artifacts need to match the official Node.js
     # Example:
@@ -150,7 +148,7 @@ Since it will not be cached always, there is possibility of hitting rate limit w
 
 ### Checking in lockfiles
 
-It's **always** recommended to commit the lockfile of your package manager for security and performance reasons. For more information consult the "Working with lockfiles" section of the [Advanced usage](docs/advanced-usage.md#working-with-lockfiles) guide.
+It's **strongly recommended** to commit the lockfile of your package manager for security and performance reasons. For more information consult the "Working with lockfiles" section of the [Advanced usage](docs/advanced-usage.md#working-with-lockfiles) guide.
 
 ## Caching global packages data
 
@@ -251,6 +249,7 @@ If the runner is not able to access github.com, any Nodejs versions requested du
  - [Publishing to npmjs and GPR with npm](docs/advanced-usage.md#publish-to-npmjs-and-gpr-with-npm)
  - [Publishing to npmjs and GPR with yarn](docs/advanced-usage.md#publish-to-npmjs-and-gpr-with-yarn)
  - [Using private packages](docs/advanced-usage.md#use-private-packages)
+ - [Using private mirror](docs/advanced-usage.md#use-private-mirror)
 
 ## Recommended permissions
 
@@ -271,4 +270,4 @@ Contributions are welcome! See [Contributor's Guide](docs/contributors.md)
 
 ## Code of Conduct
 
-:wave: Be nice. See [our code of conduct](CODE_OF_CONDUCT.md)
+:wave: Be nice. See [our code of conduct](CODE_OF_CONDUCT.md)

__tests__/authutil.test.ts

@@ -76,115 +76,102 @@ describe('authutil tests', () => {
   }
 
   it('Sets up npmrc for npmjs', async () => {
-    await auth.configAuthentication('https://registry.npmjs.org/', 'false');
+    await auth.configAuthentication('https://registry.npmjs.org/');
 
     expect(fs.statSync(rcFile)).toBeDefined();
     const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
     const rc = readRcFile(rcFile);
     expect(rc['registry']).toBe('https://registry.npmjs.org/');
-    expect(rc['always-auth']).toBe('false');
   });
 
   it('Appends trailing slash to registry', async () => {
-    await auth.configAuthentication('https://registry.npmjs.org', 'false');
+    await auth.configAuthentication('https://registry.npmjs.org');
 
     expect(fs.statSync(rcFile)).toBeDefined();
     const rc = readRcFile(rcFile);
     expect(rc['registry']).toBe('https://registry.npmjs.org/');
-    expect(rc['always-auth']).toBe('false');
   });
 
   it('Configures scoped npm registries', async () => {
     process.env['INPUT_SCOPE'] = 'myScope';
-    await auth.configAuthentication('https://registry.npmjs.org', 'false');
+    await auth.configAuthentication('https://registry.npmjs.org');
 
     expect(fs.statSync(rcFile)).toBeDefined();
     const rc = readRcFile(rcFile);
     expect(rc['@myscope:registry']).toBe('https://registry.npmjs.org/');
-    expect(rc['always-auth']).toBe('false');
   });
 
   it('Automatically configures GPR scope', async () => {
-    await auth.configAuthentication('npm.pkg.github.com', 'false');
+    await auth.configAuthentication('npm.pkg.github.com');
 
     expect(fs.statSync(rcFile)).toBeDefined();
     const rc = readRcFile(rcFile);
     expect(rc['@ownername:registry']).toBe('npm.pkg.github.com/');
-    expect(rc['always-auth']).toBe('false');
-  });
-
-  it('Sets up npmrc for always-auth true', async () => {
-    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
-    expect(fs.statSync(rcFile)).toBeDefined();
-    const rc = readRcFile(rcFile);
-    expect(rc['registry']).toBe('https://registry.npmjs.org/');
-    expect(rc['always-auth']).toBe('true');
   });
 
   it('is already set the NODE_AUTH_TOKEN export it', async () => {
     process.env.NODE_AUTH_TOKEN = 'foobar';
-    await auth.configAuthentication('npm.pkg.github.com', 'false');
+    await auth.configAuthentication('npm.pkg.github.com');
     expect(fs.statSync(rcFile)).toBeDefined();
     const rc = readRcFile(rcFile);
     expect(rc['@ownername:registry']).toBe('npm.pkg.github.com/');
-    expect(rc['always-auth']).toBe('false');
     expect(process.env.NODE_AUTH_TOKEN).toEqual('foobar');
   });
 
   it('configAuthentication should overwrite non-scoped with non-scoped', async () => {
     fs.writeFileSync(rcFile, 'registry=NNN');
-    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    await auth.configAuthentication('https://registry.npmjs.org/');
     const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
     expect(contents).toBe(
-      `//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
+      `//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}registry=https://registry.npmjs.org/`
     );
   });
 
   it('configAuthentication should overwrite only non-scoped', async () => {
     fs.writeFileSync(rcFile, `registry=NNN${os.EOL}@myscope:registry=MMM`);
-    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    await auth.configAuthentication('https://registry.npmjs.org/');
     const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
     expect(contents).toBe(
-      `@myscope:registry=MMM${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
+      `@myscope:registry=MMM${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}registry=https://registry.npmjs.org/`
     );
   });
 
   it('configAuthentication should add non-scoped to scoped', async () => {
     fs.writeFileSync(rcFile, '@myscope:registry=NNN');
-    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    await auth.configAuthentication('https://registry.npmjs.org/');
     const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
     expect(contents).toBe(
-      `@myscope:registry=NNN${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
+      `@myscope:registry=NNN${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}registry=https://registry.npmjs.org/`
     );
   });
 
   it('configAuthentication should overwrite scoped with scoped', async () => {
     process.env['INPUT_SCOPE'] = 'myscope';
     fs.writeFileSync(rcFile, `@myscope:registry=NNN`);
-    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    await auth.configAuthentication('https://registry.npmjs.org/');
     const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
     expect(contents).toBe(
-      `//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
+      `//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/`
     );
   });
 
   it('configAuthentication should overwrite only scoped', async () => {
     process.env['INPUT_SCOPE'] = 'myscope';
     fs.writeFileSync(rcFile, `registry=NNN${os.EOL}@myscope:registry=MMM`);
-    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    await auth.configAuthentication('https://registry.npmjs.org/');
     const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
     expect(contents).toBe(
-      `registry=NNN${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
+      `registry=NNN${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/`
     );
   });
 
   it('configAuthentication should add scoped to non-scoped', async () => {
     process.env['INPUT_SCOPE'] = 'myscope';
     fs.writeFileSync(rcFile, `registry=MMM`);
-    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    await auth.configAuthentication('https://registry.npmjs.org/');
     const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
     expect(contents).toBe(
-      `registry=MMM${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
+      `registry=MMM${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/`
     );
   });
 
@@ -194,20 +181,20 @@ describe('authutil tests', () => {
       rcFile,
       `@otherscope:registry=NNN${os.EOL}@myscope:registry=MMM`
     );
-    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    await auth.configAuthentication('https://registry.npmjs.org/');
     const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
     expect(contents).toBe(
-      `@otherscope:registry=NNN${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
+      `@otherscope:registry=NNN${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/`
     );
   });
 
   it('configAuthentication should add scoped to another scoped', async () => {
     process.env['INPUT_SCOPE'] = 'myscope';
     fs.writeFileSync(rcFile, `@otherscope:registry=MMM`);
-    await auth.configAuthentication('https://registry.npmjs.org/', 'true');
+    await auth.configAuthentication('https://registry.npmjs.org/');
     const contents = fs.readFileSync(rcFile, {encoding: 'utf8'});
     expect(contents).toBe(
-      `@otherscope:registry=MMM${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/${os.EOL}always-auth=true`
+      `@otherscope:registry=MMM${os.EOL}//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}${os.EOL}@myscope:registry=https://registry.npmjs.org/`
     );
   });
 });

__tests__/canary-installer.test.ts

@@ -227,7 +227,6 @@ describe('setup-node', () => {
     const versionSpec = '11.15.0';
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     // ... but not in the local cache
@@ -283,7 +282,6 @@ describe('setup-node', () => {
     const versionSpec = '19.0.0-v8-canary';
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     findSpy.mockImplementation(() => '');
@@ -324,7 +322,6 @@ describe('setup-node', () => {
 
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
-      inputs['always-auth'] = false;
       inputs['token'] = 'faketoken';
 
       const expectedUrl = `https://nodejs.org/download/v8-canary/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;
@@ -569,7 +566,6 @@ describe('setup-node', () => {
       const versionSpec = 'v20-v8-canary';
 
       inputs['node-version'] = versionSpec;
-      inputs['always-auth'] = false;
       inputs['token'] = 'faketoken';
 
       os.platform = 'linux';

__tests__/main.test.ts

@@ -1,18 +1,18 @@
+import * as cache from '@actions/cache';
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
-import * as tc from '@actions/tool-cache';
-import * as cache from '@actions/cache';
 import * as io from '@actions/io';
+import * as tc from '@actions/tool-cache';
 
 import fs from 'fs';
-import path from 'path';
 import osm from 'os';
+import path from 'path';
 
 import each from 'jest-each';
 
+import OfficialBuilds from '../src/distributions/official_builds/official_builds';
 import * as main from '../src/main';
 import * as util from '../src/util';
-import OfficialBuilds from '../src/distributions/official_builds/official_builds';
 
 describe('main tests', () => {
   let inputs = {} as any;
@@ -94,22 +94,25 @@ describe('main tests', () => {
 
   describe('getNodeVersionFromFile', () => {
     each`
-      contents                                     | expected
-      ${'12'}                                      | ${'12'}
-      ${'12.3'}                                    | ${'12.3'}
-      ${'12.3.4'}                                  | ${'12.3.4'}
-      ${'v12.3.4'}                                 | ${'12.3.4'}
-      ${'lts/erbium'}                              | ${'lts/erbium'}
-      ${'lts/*'}                                   | ${'lts/*'}
-      ${'nodejs 12.3.4'}                           | ${'12.3.4'}
-      ${'ruby 2.3.4\nnodejs 12.3.4\npython 3.4.5'} | ${'12.3.4'}
-      ${''}                                        | ${''}
-      ${'unknown format'}                          | ${'unknown format'}
-      ${'  14.1.0  '}                              | ${'14.1.0'}
-      ${'{"volta": {"node": ">=14.0.0 <=17.0.0"}}'}| ${'>=14.0.0 <=17.0.0'}
-      ${'{"volta": {"extends": "./package.json"}}'}| ${'18.0.0'}
-      ${'{"engines": {"node": "17.0.0"}}'}         | ${'17.0.0'}
-      ${'{}'}                                      | ${null}
+      contents                                                 | expected
+      ${'12'}                                                  | ${'12'}
+      ${'12.3'}                                                | ${'12.3'}
+      ${'12.3.4'}                                              | ${'12.3.4'}
+      ${'v12.3.4'}                                             | ${'12.3.4'}
+      ${'lts/erbium'}                                          | ${'lts/erbium'}
+      ${'lts/*'}                                               | ${'lts/*'}
+      ${'nodejs 12.3.4'}                                       | ${'12.3.4'}
+      ${'ruby 2.3.4\nnodejs 12.3.4\npython 3.4.5'}             | ${'12.3.4'}
+      ${''}                                                    | ${''}
+      ${'unknown format'}                                      | ${'unknown format'}
+      ${'  14.1.0  '}                                          | ${'14.1.0'}
+      ${'{"volta": {"node": ">=14.0.0 <=17.0.0"}}'}            | ${'>=14.0.0 <=17.0.0'}
+      ${'{"volta": {"extends": "./package.json"}}'}            | ${'18.0.0'}
+      ${'{"engines": {"node": "17.0.0"}}'}                     | ${'17.0.0'}
+      ${'[tools]\ngo="latest"\nnode = "24.10"'}                | ${'24.10'}
+      ${'[tools]\nnode = { version = "22.20" }'}               | ${'22.20'}
+      ${'[tools]\nnode = { postinstall = "corepack enable" }'} | ${null}
+      ${'{}'}                                                  | ${null}
     `.it('parses "$contents"', ({contents, expected}) => {
       const existsSpy = jest.spyOn(fs, 'existsSync');
       existsSpy.mockImplementation(() => true);

__tests__/nightly-installer.test.ts

@@ -255,7 +255,6 @@ describe('setup-node', () => {
     const versionSpec = '13.13.1-nightly20200415947ddec091';
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     // ... but not in the local cache
@@ -291,7 +290,6 @@ describe('setup-node', () => {
     ];
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     // ... but not in the local cache
@@ -333,7 +331,6 @@ describe('setup-node', () => {
     ];
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     // ... but not in the local cache
@@ -389,7 +386,6 @@ describe('setup-node', () => {
     const versionSpec = '18.0.0-nightly202204180699150267';
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     findSpy.mockImplementation(() => '');
@@ -427,7 +423,6 @@ describe('setup-node', () => {
 
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
-      inputs['always-auth'] = false;
       inputs['token'] = 'faketoken';
 
       const expectedUrl = `https://nodejs.org/download/nightly/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;
@@ -473,7 +468,6 @@ describe('setup-node', () => {
 
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
-      inputs['always-auth'] = false;
       inputs['token'] = 'faketoken';
       inputs['mirror'] = 'https://my-mirror.org';
       inputs['mirror-token'] = 'my-mirror-token';

__tests__/official-installer.test.ts

@@ -235,7 +235,6 @@ describe('setup-node', () => {
     const resolvedVersion = versionSpec;
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     const expectedUrl =
@@ -290,7 +289,6 @@ describe('setup-node', () => {
     const versionSpec = '11.15.0';
     const mirror = 'https://my_mirror_url';
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
     inputs['mirror'] = mirror;
     inputs['mirror-token'] = 'faketoken';
@@ -327,7 +325,6 @@ describe('setup-node', () => {
     const versionSpec = '11.15.0';
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     // ... but not in the local cache
@@ -385,7 +382,6 @@ describe('setup-node', () => {
     const resolvedVersion = versionSpec;
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     findSpy.mockImplementation(() => '');
@@ -405,7 +401,6 @@ describe('setup-node', () => {
     const versionSpec = '11.15.0';
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     // ... but not in the local cache
@@ -448,7 +443,6 @@ describe('setup-node', () => {
 
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
-      inputs['always-auth'] = false;
       inputs['token'] = 'faketoken';
 
       const expectedUrl =
@@ -560,7 +554,6 @@ describe('setup-node', () => {
 
       inputs['node-version'] = versionSpec;
       inputs['check-latest'] = 'true';
-      inputs['always-auth'] = false;
       inputs['token'] = 'faketoken';
 
       // ... but not in the local cache
@@ -602,7 +595,6 @@ describe('setup-node', () => {
 
       inputs['node-version'] = versionSpec;
       inputs['check-latest'] = 'true';
-      inputs['always-auth'] = false;
       inputs['token'] = 'faketoken';
 
       // ... but not in the local cache
@@ -882,7 +874,6 @@ describe('setup-node', () => {
 
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
-      inputs['always-auth'] = false;
       inputs['token'] = 'faketoken';
       inputs['mirror'] = 'https://my_mirror_url';
       inputs['mirror-token'] = 'faketoken';

__tests__/rc-installer.test.ts

@@ -194,7 +194,6 @@ describe('setup-node', () => {
     const versionSpec = '13.0.0-rc.0';
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     // ... but not in the local cache
@@ -239,7 +238,6 @@ describe('setup-node', () => {
     const versionSpec = '14.7.0-rc.1';
 
     inputs['node-version'] = versionSpec;
-    inputs['always-auth'] = false;
     inputs['token'] = 'faketoken';
 
     findSpy.mockImplementation(() => '');
@@ -268,7 +266,6 @@ describe('setup-node', () => {
 
       inputs['node-version'] = version;
       inputs['architecture'] = arch;
-      inputs['always-auth'] = false;
       inputs['token'] = 'faketoken';
 
       const expectedUrl = `https://nodejs.org/download/rc/v${version}/node-v${version}-${platform}-${arch}.${fileExtension}`;

action.yml

@@ -2,9 +2,6 @@ name: 'Setup Node.js environment'
 description: 'Setup a Node.js environment by adding problem matchers and optionally downloading and adding it to the PATH.'
 author: 'GitHub'
 inputs:
-  always-auth:
-    description: 'Set always-auth in npmrc.'
-    default: 'false'
   node-version:
     description: 'Version Spec of the version to use. Examples: 12.x, 10.15.1, >=10.15.0.'
   node-version-file:

docs/advanced-usage.md

@@ -1,6 +1,6 @@
 ## Working with lockfiles
 
-All supported package managers recommend that you **always** commit the lockfile, although implementations vary doing so generally provides the following benefits:
+Most supported package managers recommend that you **always** commit the lockfile, although implementations vary doing so generally provides the following benefits:
 
 - Enables faster installation for CI and production environments, due to being able to skip package resolution.
 - Describes a single representation of a dependency tree such that teammates, deployments, and continuous integration are guaranteed to install exactly the same dependencies.
@@ -35,6 +35,25 @@ Ensure that `pnpm-lock.yaml` is always committed, when on CI pass `--frozen-lock
 - [Working with Git - Lockfiles](https://pnpm.io/git#lockfiles)
 - [Documentation of `--frozen-lockfile` option](https://pnpm.io/cli/install#--frozen-lockfile)
 
+### Running without a lockfile
+
+If you choose not to use a lockfile, you must ensure that **caching is disabled**. The `cache` feature relies on the lockfile to generate a unique key for the cache entry.
+
+To run without a lockfile:
+1. Do not set the `cache` input.
+2. If your `package.json` contains a `packageManager` field set to npm (or devEngines.packageManager), automatic caching is enabled by default. Override this by setting `package-manager-cache: false`.
+
+```yaml
+steps:
+- uses: actions/checkout@v6
+- uses: actions/setup-node@v6
+  with:
+    node-version: '24'
+    package-manager-cache: false # Explicitly disable caching if you don't have a lockfile
+- run: npm install
+- run: npm test
+```
+
 ## 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.
@@ -446,9 +465,6 @@ To access private GitHub Packages within the same organization, go to "Manage Ac
 
 Please refer to the [Ensuring workflow access to your package - Configuring a package's access control and visibility](https://docs.github.com/en/packages/learn-github-packages/configuring-a-packages-access-control-and-visibility#ensuring-workflow-access-to-your-package) for more details.
 
-### always-auth input
-The always-auth input sets `always-auth=true` in .npmrc file. With this option set [npm](https://docs.npmjs.com/cli/v6/using-npm/config#always-auth)/yarn sends the authentication credentials when making a request to the registries.
-
 ## Use private mirror
 
 It is possible to use a private mirror hosting Node.js binaries. This mirror must be a full mirror of the official Node.js distribution.

package-lock.json

@@ -17,6 +17,7 @@
         "@actions/http-client": "^2.2.1",
         "@actions/io": "^1.0.2",
         "@actions/tool-cache": "^2.0.2",
+        "js-toml": "^1.0.2",
         "semver": "^7.6.3",
         "uuid": "^11.1.0"
       },
@@ -792,6 +793,18 @@
         "@babel/core": "^7.0.0-0"
       }
     },
+    "node_modules/@babel/runtime-corejs3": {
+      "version": "7.28.4",
+      "resolved": "https://registry.npmjs.org/@babel/runtime-corejs3/-/runtime-corejs3-7.28.4.tgz",
+      "integrity": "sha512-h7iEYiW4HebClDEhtvFObtPmIvrd1SSfpI9EhOeKk4CtIK/ngBWFpuhCzhdmRKtg71ylcue+9I6dv54XYO1epQ==",
+      "license": "MIT",
+      "dependencies": {
+        "core-js-pure": "^3.43.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
     "node_modules/@babel/template": {
       "version": "7.27.0",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.27.0.tgz",
@@ -857,6 +870,45 @@
       "integrity": "sha512-0hYQ8SB4Db5zvZB4axdMHGwEaQjkZzFjQiN9LVYvIFB2nSUHW9tYpxWriPrWDASIxiaXax83REcLxuSdnGPZtw==",
       "dev": true
     },
+    "node_modules/@chevrotain/cst-dts-gen": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/cst-dts-gen/-/cst-dts-gen-11.0.3.tgz",
+      "integrity": "sha512-BvIKpRLeS/8UbfxXxgC33xOumsacaeCKAjAeLyOn7Pcp95HiRbrpl14S+9vaZLolnbssPIUuiUd8IvgkRyt6NQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/gast": "11.0.3",
+        "@chevrotain/types": "11.0.3",
+        "lodash-es": "4.17.21"
+      }
+    },
+    "node_modules/@chevrotain/gast": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/gast/-/gast-11.0.3.tgz",
+      "integrity": "sha512-+qNfcoNk70PyS/uxmj3li5NiECO+2YKZZQMbmjTqRI3Qchu8Hig/Q9vgkHpI3alNjr7M+a2St5pw5w5F6NL5/Q==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/types": "11.0.3",
+        "lodash-es": "4.17.21"
+      }
+    },
+    "node_modules/@chevrotain/regexp-to-ast": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/regexp-to-ast/-/regexp-to-ast-11.0.3.tgz",
+      "integrity": "sha512-1fMHaBZxLFvWI067AVbGJav1eRY7N8DDvYCTwGBiE/ytKBgP8azTdgyrKyWZ9Mfh09eHWb5PgTSO8wi7U824RA==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/types": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/types/-/types-11.0.3.tgz",
+      "integrity": "sha512-gsiM3G8b58kZC2HaWR50gu6Y1440cHiJ+i3JUvcp/35JchYejb2+5MVeJK0iKThYpAa/P2PYFV4hoi44HD+aHQ==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/utils": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/@chevrotain/utils/-/utils-11.0.3.tgz",
+      "integrity": "sha512-YslZMgtJUyuMbZ+aKvfF3x1f5liK4mWNxghFRv7jqRR9C3R3fAOGTTKvxXDa2Y1s9zSbcpuO0cAxDYsc9SrXoQ==",
+      "license": "Apache-2.0"
+    },
     "node_modules/@eslint-community/eslint-utils": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.0.tgz",
@@ -994,10 +1046,11 @@
       }
     },
     "node_modules/@istanbuljs/load-nyc-config/node_modules/js-yaml": {
-      "version": "3.14.1",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.1.tgz",
-      "integrity": "sha512-okMH7OXXJ7YrN9Ok3/SXrnu4iX9yOk+25nqX4imS2npuvTYDmo/QEZoqwZkYaIDk3jVvBOTOIEgEhaLOynBS9g==",
+      "version": "3.14.2",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.14.2.tgz",
+      "integrity": "sha512-PMSmkqxr106Xa156c2M265Z+FTrPl+oxd/rgOQy2tijQeK5TxQ43psO1ZCwhVOSdnn+RzkzlRz/eY4BgJBYVpg==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "argparse": "^1.0.7",
         "esprima": "^4.0.0"
@@ -2406,6 +2459,20 @@
         "node": ">=10"
       }
     },
+    "node_modules/chevrotain": {
+      "version": "11.0.3",
+      "resolved": "https://registry.npmjs.org/chevrotain/-/chevrotain-11.0.3.tgz",
+      "integrity": "sha512-ci2iJH6LeIkvP9eJW6gpueU8cnZhv85ELY8w8WiFtNjMHA5ad6pQLaJo9mEly/9qUyCpvqX8/POVUTf18/HFdw==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/cst-dts-gen": "11.0.3",
+        "@chevrotain/gast": "11.0.3",
+        "@chevrotain/regexp-to-ast": "11.0.3",
+        "@chevrotain/types": "11.0.3",
+        "@chevrotain/utils": "11.0.3",
+        "lodash-es": "4.17.21"
+      }
+    },
     "node_modules/ci-info": {
       "version": "3.9.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-3.9.0.tgz",
@@ -2497,6 +2564,17 @@
       "integrity": "sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==",
       "dev": true
     },
+    "node_modules/core-js-pure": {
+      "version": "3.46.0",
+      "resolved": "https://registry.npmjs.org/core-js-pure/-/core-js-pure-3.46.0.tgz",
+      "integrity": "sha512-NMCW30bHNofuhwLhYPt66OLOKTMbOhgTTatKVbaQC3KRHpTCiRIBYvtshr+NBYSnBxwAFhjW/RfJ0XbIjS16rw==",
+      "hasInstallScript": true,
+      "license": "MIT",
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/core-js"
+      }
+    },
     "node_modules/create-jest": {
       "version": "29.7.0",
       "resolved": "https://registry.npmjs.org/create-jest/-/create-jest-29.7.0.tgz",
@@ -4314,11 +4392,22 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/js-toml": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/js-toml/-/js-toml-1.0.2.tgz",
+      "integrity": "sha512-/7IQ//bzn2a/5IDazPUNzlW7bsjxS51cxciYZDR+Z+3Le60yzT0YfI8KOWqTtBcZkXXVklhWd2OuGd8ZksB0wQ==",
+      "license": "MIT",
+      "dependencies": {
+        "chevrotain": "^11.0.3",
+        "xregexp": "^5.1.1"
+      }
+    },
     "node_modules/js-yaml": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz",
-      "integrity": "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.1.tgz",
+      "integrity": "sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==",
       "dev": true,
+      "license": "MIT",
       "dependencies": {
         "argparse": "^2.0.1"
       },
@@ -4435,6 +4524,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/lodash-es": {
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash-es/-/lodash-es-4.17.21.tgz",
+      "integrity": "sha512-mKnC+QJ9pWVzv+C4/U3rRsHapFfHvQFoFB92e52xeyGMcX6/OlIl78je1u8vePzYZSkkogMPJ2yjxxsb89cxyw==",
+      "license": "MIT"
+    },
     "node_modules/lodash.memoize": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-4.1.2.tgz",
@@ -5748,6 +5843,15 @@
         "node": ">=4.0"
       }
     },
+    "node_modules/xregexp": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/xregexp/-/xregexp-5.1.2.tgz",
+      "integrity": "sha512-6hGgEMCGhqCTFEJbqmWrNIPqfpdirdGWkqshu7fFZddmTSfgv5Sn9D2SaKloR79s5VUiUlpwzg3CM3G6D3VIlw==",
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime-corejs3": "^7.26.9"
+      }
+    },
     "node_modules/y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",

package.json

@@ -36,6 +36,7 @@
     "@actions/http-client": "^2.2.1",
     "@actions/io": "^1.0.2",
     "@actions/tool-cache": "^2.0.2",
+    "js-toml": "^1.0.2",
     "semver": "^7.6.3",
     "uuid": "^11.1.0"
   },

src/authutil.ts

@@ -4,7 +4,7 @@ import * as path from 'path';
 import * as core from '@actions/core';
 import * as github from '@actions/github';
 
-export function configAuthentication(registryUrl: string, alwaysAuth: string) {
+export function configAuthentication(registryUrl: string) {
   const npmrc: string = path.resolve(
     process.env['RUNNER_TEMP'] || process.cwd(),
     '.npmrc'
@@ -13,14 +13,10 @@ export function configAuthentication(registryUrl: string, alwaysAuth: string) {
     registryUrl += '/';
   }
 
-  writeRegistryToFile(registryUrl, npmrc, alwaysAuth);
+  writeRegistryToFile(registryUrl, npmrc);
 }
 
-function writeRegistryToFile(
-  registryUrl: string,
-  fileLocation: string,
-  alwaysAuth: string
-) {
+function writeRegistryToFile(registryUrl: string, fileLocation: string) {
   let scope: string = core.getInput('scope');
   if (!scope && registryUrl.indexOf('npm.pkg.github.com') > -1) {
     scope = github.context.repo.owner;
@@ -47,8 +43,7 @@ function writeRegistryToFile(
   const authString: string =
     registryUrl.replace(/(^\w+:|^)/, '') + ':_authToken=${NODE_AUTH_TOKEN}';
   const registryString = `${scope}registry=${registryUrl}`;
-  const alwaysAuthString = `always-auth=${alwaysAuth}`;
-  newContents += `${authString}${os.EOL}${registryString}${os.EOL}${alwaysAuthString}`;
+  newContents += `${authString}${os.EOL}${registryString}`;
   fs.writeFileSync(fileLocation, newContents);
   core.exportVariable('NPM_CONFIG_USERCONFIG', fileLocation);
   // Export empty node_auth_token if didn't exist so npm doesn't complain about not being able to find it

src/main.ts

@@ -62,9 +62,8 @@ export async function run() {
     await printEnvDetailsAndSetOutput();
 
     const registryUrl: string = core.getInput('registry-url');
-    const alwaysAuth: string = core.getInput('always-auth');
     if (registryUrl) {
-      auth.configAuthentication(registryUrl, alwaysAuth);
+      auth.configAuthentication(registryUrl);
     }
 
     const cacheDependencyPath = core.getInput('cache-dependency-path');

src/util.ts

@@ -1,6 +1,7 @@
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
 import * as io from '@actions/io';
+import {load} from 'js-toml';
 
 import fs from 'fs';
 import path from 'path';
@@ -56,6 +57,26 @@ export function getNodeVersionFromFile(versionFilePath: string): string | null {
     core.info('Node version file is not JSON file');
   }
 
+  // Try parsing the file as a mise `mise.toml` file.
+  try {
+    const manifest: Record<string, any> = load(contents);
+    if (manifest?.tools?.node) {
+      const node = manifest.tools.node;
+
+      if (typeof node === 'object' && node?.version) {
+        return node.version;
+      }
+
+      if (typeof node === 'string') {
+        return node;
+      }
+
+      return null;
+    }
+  } catch {
+    core.info('Node version file is not TOML file');
+  }
+
   const found = contents.match(/^(?:node(js)?\s+)?v?(?<version>[^\s]+)$/m);
   return found?.groups?.version ?? contents.trim();
 }