'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

const path = require('path');
const readEnv = require('read-env');

function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

const path__default = /*#__PURE__*/_interopDefaultLegacy(path);

function toPrefix(str) {
  const prefix = str.replace(/[@]/g, "").replace(/[-/]/g, "_").toUpperCase();
  return prefix.match(/^[A-Z0-9_]+$/) ? prefix : false;
}

function $parse(opts) {
  const prefix = toPrefix((opts == null ? void 0 : opts.prefix) || process.env.npm_package_name || path__default["default"].parse(process.cwd()).name);
  if (!prefix) {
    throw new Error("Invalid characters provided for prefix. The prefix can only contain letters, digits, -, _, @, and /.");
  }
  return { ...opts == null ? void 0 : opts.defaults, ...readEnv.readEnv(prefix, opts) };
}

exports.$parse = $parse;
exports["default"] = $parse;