feat: add getPackageManager helper

src/Utils/getPackageManager.ts

@@ -0,0 +1,31 @@
+/*
+ * @adonisjs/sink
+ *
+ * (c) Harminder Virk <virk@adonisjs.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+import { resolve } from 'path'
+import { pathExistsSync } from 'fs-extra'
+
+/**
+ * Returns the package manager in use by checking for the lock files
+ * on the disk or by inspecting the "npm_execpath"
+ */
+export function getPackageManager(appRoot: string): 'yarn' | 'pnpm' | 'npm' {
+  if (pathExistsSync(resolve(appRoot, 'yarn.lock'))) {
+    return 'yarn'
+  }
+
+  if (pathExistsSync(resolve(appRoot, 'pnpm-lock.yaml'))) {
+    return 'pnpm'
+  }
+
+  return process.env.npm_execpath && process.env.npm_execpath.includes('yarn')
+    ? 'yarn'
+    : process.env.npm_execpath && process.env.npm_execpath.includes('pnpm')
+    ? 'pnpm'
+    : 'npm'
+}

src/Utils/index.ts

@@ -9,3 +9,4 @@
 
 export { isEmptyDir } from './isEmptyDir'
 export { copyFiles } from './copyFiles'
+export { getPackageManager } from './getPackageManager'