index.ts

export { parseArgsStringToArgv };
export default function parseArgsStringToArgv(
  value: string,
  env?: string,
  file?: string
): string[] {
  // ([^\s'"]([^\s'"]*(['"])([^\3]*?)\3)+[^\s'"]*) Matches nested quotes until the first space outside of quotes

  // [^\s'"]+ or Match if not a space ' or "

  // (['"])([^\5]*?)\5 or Match "quoted text" without quotes
  // `\3` and `\5` are a backreference to the quote style (' or ") captured
  const myRegexp = /([^\s'"]([^\s'"]*(['"])([^\3]*?)\3)+[^\s'"]*)|[^\s'"]+|(['"])([^\5]*?)\5/gi;
  const myString = value;
  const myArray: string[] = [];
  if (env) {
    myArray.push(env);
  }
  if (file) {
    myArray.push(file);
  }
  let match: RegExpExecArray | null;
  do {
        // Each call to exec returns the next regex match as an array
    match = myRegexp.exec(myString);
    if (match !== null) {
      // Index 1 in the array is the captured group if it exists
      // Index 0 is the matched text, which we use if no captured group exists
      myArray.push(firstString(match[1], match[6], match[0])!);
    }
  } while (match !== null);

  return myArray;
}

// Accepts any number of arguments, and returns the first one that is a string
// (even an empty string)
function firstString(...args: Array<any>): string | undefined {
  for (let i = 0; i < args.length; i++) {
    const arg = args[i];
    if (typeof arg === "string") {
      return arg;
    }
  }
}