Add Option to Enable corepack

.gitignore

@@ -5,6 +5,9 @@ __tests__/runner/*
 validate/temp
 validate/node
 
+# JetBrain's IDEs
+.idea
+
 # Rest of the file pulled from https://github.com/github/gitignore/blob/master/Node.gitignore
 # Logs
 logs

README.md

@@ -121,6 +121,7 @@ jobs:
 6. [Publishing to npmjs and GPR with npm](docs/advanced-usage.md#publish-to-npmjs-and-gpr-with-npm)
 7. [Publishing to npmjs and GPR with yarn](docs/advanced-usage.md#publish-to-npmjs-and-gpr-with-yarn)
 8. [Using private packages](docs/advanced-usage.md#use-private-packages)
+9. [Use `corepack` to automatically install package managers](docs/advanced-usage.md#corepack)
 
 ## License
 

__tests__/installer.test.ts

@@ -56,7 +56,6 @@ describe('setup-node', () => {
     platSpy.mockImplementation(() => os['platform']);
     archSpy = jest.spyOn(osm, 'arch');
     archSpy.mockImplementation(() => os['arch']);
-    execSpy = jest.spyOn(cp, 'execSync');
 
     // @actions/tool-cache
     findSpy = jest.spyOn(tc, 'find');
@@ -110,6 +109,7 @@ describe('setup-node', () => {
     // @actions/exec
     getExecOutputSpy = jest.spyOn(exec, 'getExecOutput');
     getExecOutputSpy.mockImplementation(() => 'v16.15.0');
+    execSpy = jest.spyOn(cp, 'execSync');
   });
 
   afterEach(() => {
@@ -396,6 +396,18 @@ describe('setup-node', () => {
     }
   }, 100000);
 
+  it('enables corepack if specified', async () => {
+    inputs['corepack'] = 'true';
+    await main.run();
+    expect(execSpy).toHaveBeenCalledWith('corepack', ['enable']);
+  });
+
+  it('enables corepack with arguments if they are passed', async () => {
+    inputs['corepack'] = 'npm';
+    await main.run();
+    expect(execSpy).toHaveBeenCalledWith('corepack', ['enable', 'npm']);
+  });
+
   describe('check-latest flag', () => {
     it('use local version and dont check manifest if check-latest is not specified', async () => {
       os.platform = 'linux';

action.yml

@@ -13,7 +13,10 @@ inputs:
     description: 'Target architecture for Node to use. Examples: x86, x64. Will use system architecture by default.'
   check-latest:
     description: 'Set this option if you want the action to check for the latest available version that satisfies the version spec.'
-    default: false
+    default: 'false'
+  corepack:
+    description: 'Enable corepack. Setting this to anything but `true` will pass the value to `corepack enable`.'
+    default: 'false'
   registry-url:
     description: '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.'
   scope:
@@ -25,10 +28,10 @@ inputs:
     description: 'Used to specify a package manager for caching in the default directory. Supported values: npm, yarn, pnpm.'
   cache-dependency-path:
     description: 'Used to specify the path to a dependency file: package-lock.json, yarn.lock, etc. Supports wildcards or a list of file names for caching multiple dependencies.'
-# TODO: add input to control forcing to pull from cloud or dist. 
+# TODO: add input to control forcing to pull from cloud or dist.
 #       escape valve for someone having issues or needing the absolute latest which isn't cached yet
 outputs:
-  cache-hit: 
+  cache-hit:
     description: 'A boolean value to indicate if a cache was hit.'
   node-version:
     description: 'The installed node version.'