1 files changed, 42 insertions, 0 deletions

diff --git a/packages/turbo-codemod/src/utils/getPackageManager.ts b/packages/turbo-codemod/src/utils/getPackageManager.ts
new file mode 100644
index 0000000..1df0acc
--- /dev/null
+++ b/packages/turbo-codemod/src/utils/getPackageManager.ts
@@ -0,0 +1,42 @@
+import findUp from "find-up";
+import path from "path";
+
+export type PackageManager = "yarn" | "pnpm" | "npm";
+
+const cache: { [cwd: string]: PackageManager } = {};
+
+export default function getPackageManager({
+  directory,
+}: { directory?: string } = {}): PackageManager | undefined {
+  const cwd = directory || process.cwd();
+  if (cache[cwd]) {
+    return cache[cwd];
+  }
+
+  const lockFile = findUp.sync(
+    ["yarn.lock", "pnpm-lock.yaml", "package-lock.json"],
+    {
+      cwd,
+    }
+  );
+
+  if (!lockFile) {
+    return;
+  }
+
+  switch (path.basename(lockFile)) {
+    case "yarn.lock":
+      cache[cwd] = "yarn";
+      break;
+
+    case "pnpm-lock.yaml":
+      cache[cwd] = "pnpm";
+      break;
+
+    case "package-lock.json":
+      cache[cwd] = "npm";
+      break;
+  }
+
+  return cache[cwd];
+}