/**
 * parseArgv
 * returns an object from argv
 * @param {String[]} required - array of required arguments
 * @param {String[]} optional=[] - array of optional arguments to capture
 * @returns {object}
 */
export default function parseArgv(required: string[], optional: string[] = []): any{
    let parsed = {};
    for (let arg of required) {
      const argIndex = process.argv.indexOf(`--${arg}`);
      let argValue = argIndex >= 0 ? process.argv[argIndex + 1] : '';
      if(!argValue) throw new Error(arg + ' is a required command argument'); 
      Object.assign(parsed, {[arg]: argValue});
    }
    for (let arg of optional) {
      const argIndex = process.argv.indexOf(`--${arg}`);
      let argValue = argIndex >= 0 ? process.argv[argIndex + 1] : '';
      Object.assign(parsed, {[arg]: argValue});
    }
    return parsed;
  }