create-nex-app/src/helpers/get-pkg-manager.ts

create websites using my preferred stack

import { execSync } from "child_process";

type PackageManager = "npm" | "pnpm" | "yarn";

export function getPkgManager(): PackageManager {
  try {
    const userAgent = process.env.npm_config_user_agent;

    if (userAgent) {
      if (userAgent.startsWith("yarn")) {
        return "yarn";
      } else if (userAgent.startsWith("pnpm")) {
        return "pnpm";
      }
    }
    try {
      execSync("yarn --version", { stdio: "ignore" });
      return "yarn";
    } catch {
      execSync("pnpm --version", { stdio: "ignore" });
      return "pnpm";
    }
  } catch {
    return "npm";
  }
}