commit-and-tag-version/lib/detect-package-manager.js

replacement for `npm version` with automatic CHANGELOG generation

/**
 * modified from <https://github.com/egoist/detect-package-manager/blob/main/src/index.ts>
 * the original code is licensed under MIT
 * modified to support only detecting lock file and not detecting global package manager
 */

const { promises: fs } = require('fs');
const { resolve } = require('path');

/**
 * Check if a path exists
 */
async function pathExists(p) {
  try {
    await fs.access(p);
    return true;
  } catch {
    return false;
  }
}

function getTypeofLockFile(cwd = '.') {
  return Promise.all([
    pathExists(resolve(cwd, 'yarn.lock')),
    pathExists(resolve(cwd, 'package-lock.json')),
    pathExists(resolve(cwd, 'pnpm-lock.yaml')),
  ]).then(([isYarn, isNpm, isPnpm]) => {
    let value = null;

    if (isYarn) {
      value = 'yarn';
    } else if (isPnpm) {
      value = 'pnpm';
    } else if (isNpm) {
      value = 'npm';
    }

    return value;
  });
}

const detectPMByLockFile = async (cwd) => {
  const type = await getTypeofLockFile(cwd);
  if (type) {
    return type;
  }

  return 'npm';
};

module.exports = {
  detectPMByLockFile,
};