fix(shadcn-ui): use @antfu/ni to detect package manager (#677)

* fix(cli): use @antfu/ni to detect package manager

* chore(cli): cleanup imports

* Create cyan-houses-dress.md

---------

Co-authored-by: shadcn <m@shadcn.com>

packages/cli/src/utils/get-package-manager.ts

@@ -1,50 +1,13 @@
-import { promises as fs } from "fs"
-import path from "path"
-
-async function fileExists(path: string) {
-  try {
-    await fs.access(path)
-    return true
-  } catch {
-    return false
-  }
-}
+import { detect } from "@antfu/ni"
 
 export async function getPackageManager(
   targetDir: string
 ): Promise<"yarn" | "pnpm" | "npm"> {
-  const [yarnLock, npmLock, pnpmLock] = await Promise.all([
-    fileExists(path.resolve(targetDir, "yarn.lock")),
-    fileExists(path.resolve(targetDir, "package-lock.json")),
-    fileExists(path.resolve(targetDir, "pnpm-lock.yaml")),
-  ])
+  const packageManager = await detect({ programmatic: true, cwd: targetDir })
 
-  if (yarnLock) {
-    return "yarn"
-  }
+  if (packageManager === "yarn@berry") return "yarn"
+  if (packageManager === "pnpm@6") return "pnpm"
+  if (packageManager === "bun") return "npm"
 
-  if (pnpmLock) {
-    return "pnpm"
-  }
-
-  if (npmLock) {
-    return "npm"
-  }
-
-  // Match based on used package manager
-  const userAgent = process.env.npm_config_user_agent
-
-  if (!userAgent) {
-    return "npm"
-  }
-
-  if (userAgent.startsWith("yarn")) {
-    return "yarn"
-  }
-
-  if (userAgent.startsWith("pnpm")) {
-    return "pnpm"
-  }
-
-  return "npm"
+  return packageManager ?? "npm"
 }