Generate a regexp for a string

generate_regexp.ts

export const generateRegexp = (str: string): string => {
  const ranges = uniq(
    uniq([...str]).map((char) => {
      if (char.match(/[a-z]/) != null) {
        return 'a-z';
      }

      if (char.match(/[A-Z]/) != null) {
        return 'A-Z';
      }

      if (char.match(/[0-9]/) != null) {
        return '0-9';
      }

      console.log(char);

      return char;
    }),
  );

  return `/${ranges.join('')}/i`;
}

const uniq = (values) => Object.keys(
  values.reduce(
    (acc, char) => {
      acc[char] = true;
      return acc;
    },
    {},
  ),
);