feat: add pnpm support for package installation

packages/webpack-cli/lib/utils/__tests__/get-package-manager.test.js

@@ -22,7 +22,9 @@ describe('packageUtils', () => {
     describe('getPackageManager', () => {
         const testYarnLockPath = path.resolve(__dirname, 'test-yarn-lock');
         const testNpmLockPath = path.resolve(__dirname, 'test-npm-lock');
-        const testBothPath = path.resolve(__dirname, 'test-both');
+        const testPnpmLockPath = path.resolve(__dirname, 'test-pnpm-lock');
+        const testNpmAndPnpmPath = path.resolve(__dirname, 'test-npm-and-pnpm');
+        const testAllPath = path.resolve(__dirname, 'test-all-lock');
 
         const cwdSpy = jest.spyOn(process, 'cwd');
 
@@ -33,7 +35,8 @@ describe('packageUtils', () => {
                 fs.mkdirSync(testNpmLockPath);
             }
             fs.writeFileSync(path.resolve(testNpmLockPath, 'package-lock.json'), '');
-            fs.writeFileSync(path.resolve(testBothPath, 'package-lock.json'), '');
+            fs.writeFileSync(path.resolve(testNpmAndPnpmPath, 'package-lock.json'), '');
+            fs.writeFileSync(path.resolve(testAllPath, 'package-lock.json'), '');
         });
 
         beforeEach(() => {
@@ -52,8 +55,20 @@ describe('packageUtils', () => {
             expect(syncMock.mock.calls.length).toEqual(0);
         });
 
+        it('should find pnpm-lock.yaml', () => {
+            cwdSpy.mockReturnValue(testPnpmLockPath);
+            expect(getPackageManager()).toEqual('pnpm');
+            expect(syncMock.mock.calls.length).toEqual(0);
+        });
+
+        it('should prioritize npm over pnpm', () => {
+            cwdSpy.mockReturnValue(testNpmAndPnpmPath);
+            expect(getPackageManager()).toEqual('npm');
+            expect(syncMock.mock.calls.length).toEqual(0);
+        });
+
         it('should prioritize yarn with many lock files', () => {
-            cwdSpy.mockReturnValue(testBothPath);
+            cwdSpy.mockReturnValue(testAllPath);
             expect(getPackageManager()).toEqual('yarn');
             expect(syncMock.mock.calls.length).toEqual(0);
         });

packages/webpack-cli/lib/utils/__tests__/prompt-installation.test.js

@@ -64,6 +64,22 @@ describe('promptInstallation', () => {
         expect(runCommand.mock.calls[0][0]).toEqual('yarn add -D test-package');
     });
 
+    it('should prompt to install using pnpm if pnpm is package manager', async () => {
+        prompt.mockReturnValue({
+            installConfirm: true,
+        });
+        getPackageManager.mockReturnValue('pnpm');
+        const preMessage = jest.fn();
+        const promptResult = await promptInstallation('test-package', preMessage);
+        expect(promptResult).toBeTruthy();
+        expect(preMessage.mock.calls.length).toEqual(1);
+        expect(prompt.mock.calls.length).toEqual(1);
+        expect(runCommand.mock.calls.length).toEqual(1);
+        expect(prompt.mock.calls[0][0][0].message).toMatch(/Would you like to install test-package\?/);
+        // install the package using npm
+        expect(runCommand.mock.calls[0][0]).toEqual('pnpm install -D test-package');
+    });
+
     it('should not install if install is not confirmed', async () => {
         prompt.mockReturnValue({
             installConfirm: false,

packages/webpack-cli/lib/utils/get-package-manager.js

@@ -12,11 +12,16 @@ const { sync } = require('execa');
 function getPackageManager() {
     const hasLocalYarn = fs.existsSync(path.resolve(process.cwd(), 'yarn.lock'));
     const hasLocalNpm = fs.existsSync(path.resolve(process.cwd(), 'package-lock.json'));
+    const hasLocalPnpm = fs.existsSync(path.resolve(process.cwd(), 'pnpm-lock.yaml'));
+
     if (hasLocalYarn) {
         return 'yarn';
     } else if (hasLocalNpm) {
         return 'npm';
+    } else if (hasLocalPnpm) {
+        return 'pnpm';
     }
+
     try {
         // if the sync function below fails because yarn is not installed,
         // an error will be thrown

packages/webpack-cli/lib/utils/prompt-installation.js

@@ -11,6 +11,7 @@ const { packageExists } = require('./package-exists');
  */
 async function promptInstallation(packageName, preMessage) {
     const packageManager = getPackageManager();
+    // yarn uses 'add' command, rest npm and pnpm both use 'install'
     const options = [packageManager === 'yarn' ? 'add' : 'install', '-D', packageName];
 
     const commandToBeRun = `${packageManager} ${options.join(' ')}`;