Function takeFlag

src/index.js:113–117

(rest, flag)

  if (!input && defaults.action) {
    rest = defaults.action;
  } else {
    [first, rest] = splitFirst(input);
    if (first === "--watch") {
      intervalMs = defaults.intervalMs ?? 0;
      rest = input;
    } else if (first) {
      const parsedDuration = parseDuration(first);
      if (parsedDuration !== null)