feat(pnpm): support pnpm to install dependencies

.github/workflows/ci.yml

@@ -22,6 +22,8 @@ jobs:
         uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
+      - name: Install pnpm
+        run: npm install -g pnpm
       - name: Install dependencies
         run: npm ci
       - name: Build & lint & test
@@ -35,6 +37,8 @@ jobs:
         uses: actions/setup-node@v6
         with:
           node-version: 'latest'
+      - name: Install pnpm
+        run: npm install -g pnpm
       - name: Install dependencies
         run: npm ci
       - name: test-mutation

README.md

@@ -36,6 +36,7 @@ Options:
 
 - `-h, --help`: Output this help
 - `-S, --save`: Saved packages will appear in your package.json under "localDependencies"
+- `--pkg=<pnpm|npm>`: Specify which package manager to use. By default it will try to auto detect (see if `pnpm-lock.yaml` exists in the current directory).
 - `-T, --target-siblings`: Instead of installing into this package, this package gets installed into sibling packages
   which depend on this package by putting it in the "localDependencies".
   Useful in a [lerna](https://github.com/lerna/lerna) style monorepo.

src/LocalInstaller.ts

@@ -6,6 +6,7 @@ import { helpers } from './helpers.ts';
 import type { InstallTarget, PackageJson } from './index.ts';
 import { utils } from './utils.ts';
 import type { Options as ExecaOptions } from 'execa';
+import { prober, type PackageManager } from './prober.ts';
 
 interface PackageByDirectory {
   [directory: string]: PackageJson;
@@ -17,6 +18,7 @@ export interface Env {
 
 export interface Options {
   npmEnv?: Env;
+  packageManager: PackageManager | undefined;
 }
 
 export interface ListByPackage {
@@ -89,14 +91,25 @@ export class LocalInstaller extends EventEmitter {
     const toInstall = target.sources.map((source) =>
       resolvePackFile(this.uniqueDir, source.packageJson),
     );
+    const pkgManager =
+      this.options.packageManager ?? (await prober.probePackageManager());
     const options: ExecaOptions = {
       cwd: target.directory,
       maxBuffer: TEN_MEGA_BYTE,
-      env: this.options.npmEnv,
+      env: {
+        ...this.options.npmEnv,
+        npm_config_save: 'false',
+        npm_config_lockfile: 'false',
+      },
     };
+    const installArgs =
+      pkgManager === 'pnpm'
+        ? ['add', ...toInstall]
+        : ['i', '--no-save', '--no-package-lock', ...toInstall];
+
     const { stdout, stderr } = await utils.exec(
-      'npm',
-      ['i', '--no-save', '--no-package-lock', ...toInstall],
+      pkgManager,
+      installArgs,
       options,
     );
     this.emit(

src/Options.ts

@@ -1,3 +1,5 @@
+import { validPackageManagers, type PackageManager } from './prober.ts';
+
 export class Options {
   public readonly dependencies: string[];
   public readonly options: string[];
@@ -21,6 +23,15 @@ export class Options {
           `Invalid use of option --target-siblings. Cannot be used together with --save`,
         ),
       );
+    } else if (
+      this.packageManager &&
+      !validPackageManagers.includes(this.packageManager)
+    ) {
+      return Promise.reject(
+        new Error(
+          `Invalid package manager <${this.packageManager}> specified. Please use either 'npm' or 'pnpm'.`,
+        ),
+      );
     } else {
       return Promise.resolve();
     }
@@ -34,6 +45,15 @@ export class Options {
     return this.flag('-T', '--target-siblings');
   }
 
+  public get packageManager(): PackageManager | undefined {
+    const pkgOption = this.options.find((opt) => opt.startsWith('--pkg='));
+    if (pkgOption) {
+      const [, value] = pkgOption.split('=');
+      return value as PackageManager;
+    }
+    return undefined;
+  }
+
   public get save(): boolean {
     return this.flag('-S', '--save');
   }

src/cli.ts

@@ -23,6 +23,9 @@ export async function cli(argv: string[]): Promise<void> {
     l(
       ' -S, --save              Saved packages will appear in your package.json under "localDependencies"',
     );
+    l(
+      '--pkg=<npm|pnpm>         Specify which package manager to use (default: auto-detect)',
+    );
     l(
       ' -T, --target-siblings   Instead of installing into this package, this package gets installed into sibling packages',
     );

src/currentDirectoryInstall.ts

@@ -7,9 +7,12 @@ import { storage } from './save.ts';
 export const currentDirectoryInstaller = {
   install: async (options: Options): Promise<void> => {
     const localDependencies = await readLocalDependencies(options.dependencies);
-    const installer = new LocalInstaller({
-      [process.cwd()]: localDependencies,
-    });
+    const installer = new LocalInstaller(
+      {
+        [process.cwd()]: localDependencies,
+      },
+      { packageManager: options.packageManager },
+    );
     progressReporter.report(installer);
     const targets = await installer.install();
     await storage.saveIfNeeded(targets, options);

src/executor.ts

@@ -4,7 +4,7 @@ import { siblingInstaller } from './siblingInstall.ts';
 
 export function execute(options: Options): Promise<void> {
   if (options.targetSiblings) {
-    return siblingInstaller.install();
+    return siblingInstaller.install(options);
   } else {
     return currentDirectoryInstaller.install(options);
   }

src/prober.ts

@@ -0,0 +1,17 @@
+export const validPackageManagers = ['npm', 'pnpm'] as const;
+export type PackageManager = (typeof validPackageManagers)[number];
+import { promises as fs } from 'fs';
+
+export const prober = {
+  probePackageManager: async (): Promise<PackageManager> => {
+    // Check for pnpm-lock.yaml
+    try {
+      await fs.access('pnpm-lock.yaml');
+      return 'pnpm';
+    } catch {
+      // File does not exist
+    }
+    // Default to npm if no lock file found
+    return 'npm';
+  },
+};

src/siblingInstall.ts

@@ -1,7 +1,12 @@
 import { promises as fs } from 'fs';
 import path from 'path';
 import { helpers } from './helpers.ts';
-import { type ListByPackage, type Package, LocalInstaller } from './index.ts';
+import {
+  type ListByPackage,
+  type Package,
+  LocalInstaller,
+  Options,
+} from './index.ts';
 import { progressReporter } from './progress.ts';
 
 function filterTruthy(values: Array<Package | null>): Package[] {
@@ -34,12 +39,14 @@ function siblingTargetsCurrent(siblingPackage: Package): boolean {
 }
 
 export const siblingInstaller = {
-  async install(): Promise<void> {
+  async install(options: Options): Promise<void> {
     const siblings = await readSiblingTargets();
     const targets = siblings.filter(siblingTargetsCurrent);
     const sourceByTarget: ListByPackage = {};
     targets.forEach((target) => (sourceByTarget[target.directory] = ['.']));
-    const installer = new LocalInstaller(sourceByTarget);
+    const installer = new LocalInstaller(sourceByTarget, {
+      packageManager: options.packageManager,
+    });
     progressReporter.report(installer);
     await installer.install();
   },

test/integration/cli.it.spec.ts

@@ -10,7 +10,7 @@ const installLocal = path.resolve('bin', 'install-local');
 const tmpDir = path.resolve(os.tmpdir(), 'local-installer-it');
 const tmpFolder = (name: string) => path.resolve(tmpDir, name);
 
-describe('install-local cli given 3 packages', () => {
+describe('install-local cli', () => {
   let packages: {
     one: PackageHelper;
     two: PackageHelper;
@@ -85,13 +85,62 @@ describe('install-local cli given 3 packages', () => {
       cwd: packages.one.directory,
     });
   });
+  it('should support pnpm', async () => {
+    // Arrange
+    packages.one.packageJson.localDependencies = {
+      two: '../two',
+    };
+    packages.two.packageJson.version = '1.0.0';
+    packages.one.pnpmLock = emptyPnpmLockFile;
+    await Promise.all([
+      packages.one.writePackage(),
+      packages.two.writePackage(),
+    ]);
+    await execaCommand('pnpm add -E typed-inject@5.0.0', {
+      cwd: packages.one.directory,
+    });
+    const expectedLink = await fs.readlink(
+      path.resolve(packages.one.directory, 'node_modules', 'typed-inject'),
+    );
+    expect(expectedLink).to.contain(
+      path.join('.pnpm', 'typed-inject@5.0.0', 'node_modules', 'typed-inject'),
+    ); // verify arrange
+    const expectedPnpmLock = await packages.one.readFile('pnpm-lock.yaml');
+
+    // Act
+    await execaCommand(`node ${installLocal}`, {
+      cwd: packages.one.directory,
+    });
+
+    // Assert
+    const installed = await packages.one.readdir('node_modules');
+    expect(installed).to.deep.eq(['two', 'typed-inject']);
+    const actualLink = await fs.readlink(
+      path.resolve(packages.one.directory, 'node_modules', 'typed-inject'),
+    );
+    expect(actualLink).to.eq(expectedLink); // verify arrange
+    expect(await packages.one.readFile('pnpm-lock.yaml')).to.eq(
+      expectedPnpmLock,
+    );
+    const actualPackageOne = JSON.parse(
+      await packages.one.readFile('package.json'),
+    ) as PackageJson;
+    expect(actualPackageOne.dependencies).deep.eq({
+      'typed-inject': '5.0.0',
+    });
+    expect(actualPackageOne.devDependencies).to.be.undefined;
+    expect(actualPackageOne.localDependencies).to.deep.eq({
+      two: '../two',
+    });
+  });
 });
 
 class PackageHelper implements Package {
   private name;
   public directory: string;
   public packageJson: PackageJson;
   public packageLock: Record<string, unknown> | undefined;
+  public pnpmLock: string | undefined;
   constructor(name: string) {
     this.name = name;
     this.directory = tmpFolder(name);
@@ -124,6 +173,24 @@ class PackageHelper implements Package {
             'utf-8',
           )
         : Promise.resolve(),
+      this.pnpmLock
+        ? fs.writeFile(
+            path.resolve(this.directory, 'pnpm-lock.yaml'),
+            this.pnpmLock,
+            'utf-8',
+          )
+        : Promise.resolve(),
     ]);
   }
 }
+
+const emptyPnpmLockFile = `lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .: {}
+`;