fix(auto-install): prevent pnpm from mutating workspace lockfile via --ignore-workspace; restore workspace lockfile (v9)

Author: CharlieHelps

packages/auto-install/src/index.ts

@@ -42,7 +42,8 @@ export default function autoInstall(opts: RollupAutoInstallOptions = {}): Plugin
     // intentionally undocumented options. used for tests
     commands: {
       npm: 'npm install',
-      pnpm: 'pnpm install',
+      // Prevent pnpm from treating test fixtures as part of the workspace
+      pnpm: 'pnpm install --ignore-workspace',
       yarn: 'yarn add'
     },
     manager: fs.existsSync('yarn.lock') ? 'yarn' : fs.existsSync('pnpm-lock.yaml') ? 'pnpm' : 'npm',