Package Managers

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

  if (userAgent.startsWith("yarn")) {
    return "yarn";
  }

  if (userAgent.startsWith("pnpm")) {
    return "pnpm";
  }

  if (userAgent.startsWith("bun")) {
    return "bun";
  }

  return "npm";
}

npx create-nextjs-dapp my-dapp

yarn create nextjs-dapp my-dapp

pnpm create nextjs-dapp my-dapp

bunx create-nextjs-dapp my-dapp

# Force npm
npx create-nextjs-dapp my-dapp --use-npm

# Force yarn
npx create-nextjs-dapp my-dapp --use-yarn

# Force pnpm
npx create-nextjs-dapp my-dapp --use-pnpm

# Force bun
npx create-nextjs-dapp my-dapp --use-bun

export function install(
  root: string,
  packageManager: PackageManager
): boolean {
  const commands: Record<PackageManager, string> = {
    npm: "npm install",
    yarn: "yarn",
    pnpm: "pnpm install",
    bun: "bun install",
  };

  try {
    execSync(commands[packageManager], {
      cwd: root,
      stdio: "pipe",
    });
    return true;
  } catch {
    return false;
  }
}

# Will detect npm
npx create-nextjs-dapp

# Will detect yarn
yarn create nextjs-dapp

# Will detect pnpm
pnpm create nextjs-dapp

# Will detect bun
bunx create-nextjs-dapp

# Create with npm (override detection)
pnpm create nextjs-dapp my-app --use-npm --yes

# Create with pnpm and auto-install
npx create-nextjs-dapp my-app --use-pnpm --install

# Create with bun
yarn create nextjs-dapp my-app --use-bun

# Create project with yarn, initialize git, and install dependencies
yarn create nextjs-dapp my-dapp --git --install

# The CLI will:
# 1. Detect yarn as the package manager
# 2. Generate the project
# 3. Initialize git repository
# 4. Run 'yarn' to install dependencies
# 5. Show next steps with 'yarn dev'

export function getRunCommand(packageManager: PackageManager): string {
  switch (packageManager) {
    case "yarn":
      return "yarn dev";
    case "pnpm":
      return "pnpm dev";
    case "bun":
      return "bun dev";
    default:
      return "npm run dev";
  }
}