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const fs = require("fs");
const path = require("path");
const { sync } = require("execa");

const utils = require("./index");

/**
 *
 * Returns the name of package manager to use,
 * preference order - npm > yarn > pnpm
 *
 * @returns {String} - The package manager name
 */
function getPackageManager() {
    const hasLocalNpm = fs.existsSync(path.resolve(process.cwd(), "package-lock.json"));

    if (hasLocalNpm) {
        return "npm";
    }

    const hasLocalYarn = fs.existsSync(path.resolve(process.cwd(), "yarn.lock"));

    if (hasLocalYarn) {
        return "yarn";
    }

    const hasLocalPnpm = fs.existsSync(path.resolve(process.cwd(), "pnpm-lock.yaml"));

    if (hasLocalPnpm) {
        return "pnpm";
    }

    try {
        // the sync function below will fail if npm is not installed,
        // an error will be thrown
        if (sync("npm", ["--version"])) {
            return "npm";
        }
    } catch (e) {
        // Nothing
    }

    try {
        // the sync function below will fail if yarn is not installed,
        // an error will be thrown
        if (sync("yarn", ["--version"])) {
            return "yarn";
        }
    } catch (e) {
        // Nothing
    }

    try {
        // the sync function below will fail if pnpm is not installed,
        // an error will be thrown
        if (sync("pnpm", ["--version"])) {
            return "pnpm";
        }
    } catch (e) {
        utils.logger.error("No package manager found.");
        process.exit(2);
    }
}

module.exports = getPackageManager;