1 files changed, 53 insertions, 0 deletions

diff --git a/packages/turbo-utils/src/managers.ts b/packages/turbo-utils/src/managers.ts
new file mode 100644
index 0000000..ab9c53d
--- /dev/null
+++ b/packages/turbo-utils/src/managers.ts
@@ -0,0 +1,53 @@
+import execa from "execa";
+import os from "os";
+
+export type PackageManager = "npm" | "yarn" | "pnpm";
+export type PackageManagerAvailable = { available: boolean; version?: string };
+
+async function getVersion(
+  packageManager: string
+): Promise<PackageManagerAvailable> {
+  // run the check from tmpdir to avoid corepack conflicting -
+  // this is no longer needed as of https://github.com/nodejs/corepack/pull/167
+  // but we'll keep the behavior for those on older versions)
+  const execOptions = {
+    cwd: os.tmpdir(),
+    env: { COREPACK_ENABLE_STRICT: "0" },
+  };
+
+  let available = false;
+  try {
+    const userAgent = process.env.npm_config_user_agent;
+    if (userAgent && userAgent.startsWith(packageManager)) {
+      available = true;
+    }
+
+    const result = await execa(packageManager, ["--version"], execOptions);
+    return {
+      available: true,
+      version: result.stdout.trim(),
+    };
+  } catch (e) {
+    return {
+      available,
+    };
+  }
+}
+
+async function getAvailablePackageManagers(): Promise<
+  Record<PackageManager, PackageManagerAvailable>
+> {
+  const [yarn, npm, pnpm] = await Promise.all([
+    getVersion("yarnpkg"),
+    getVersion("npm"),
+    getVersion("pnpm"),
+  ]);
+
+  return {
+    yarn,
+    pnpm,
+    npm,
+  };
+}
+
+export { getAvailablePackageManagers };