obtain-package-manager/dist/index.mjs

obtain which package manager you're using (yarn or npm)

import { existsSync } from 'fs';
import child_process from 'child_process';
import { resolve } from 'path';

const SEMVER_REGEX = /^\d+.\d+.\d+$/;
function pathExists(p) {
  return existsSync(p);
}
async function exec_async(...commands) {
  const command_string = commands.join(" ");
  return new Promise((resolve2, reject) => {
    child_process.exec(command_string, (error, stdout, stderr) => {
      if (error)
        return reject(error);
      if (stderr)
        return reject(stderr.trim());
      resolve2(stdout.trim());
    });
  });
}
function hasGlobalInstallation(pm, cache) {
  const key = `has_global_${pm}`;
  if (cache.has(key))
    return Promise.resolve(cache.get(key));
  return exec_async(pm, "--version").then((stdout) => {
    return SEMVER_REGEX.test(stdout);
  }).then((value) => {
    cache.set(key, value);
    return value;
  });
}
function getTypeofLockFile(cwd = ".", cache) {
  const key = `lockfile_${cwd}`;
  if (cache.has(key))
    return Promise.resolve(cache.get(key));
  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";
    cache.set(key, value);
    return value;
  });
}
async function getPackManagerVersion(pm = "npm") {
  return exec_async(pm || "npm", "--version").then((stdout) => stdout);
}
function clearCache(cache) {
  return cache.clear();
}

const cache = /* @__PURE__ */ new Map();
const getPackageManager = async ({ cwd } = {}) => {
  const type = await getTypeofLockFile(cwd, cache);
  if (type)
    return type;
  const [hasYarn, hasPnpm] = await Promise.all([
    hasGlobalInstallation("yarn", cache),
    hasGlobalInstallation("pnpm", cache)
  ]);
  if (hasYarn)
    return "yarn";
  if (hasPnpm)
    return "pnpm";
  return "npm";
};

export { clearCache, getPackManagerVersion, getPackageManager };