stripAnsi.js

/*
 * This code is based on the strip-ansi library by Chalk.
 * Source: https://github.com/chalk/strip-ansi
 */
function ansiRegex({ onlyFirst = false } = {}) {
  const pattern = [
    '[\\u001B\\u009B][[\\]()#;?]*(?:(?:(?:(?:;[-a-zA-Z\\d\\/#&.:=?%@~_]+)*|[a-zA-Z\\d]+(?:;[-a-zA-Z\\d\\/#&.:=?%@~_]*)*)?\\u0007)',
    '(?:(?:\\d{1,4}(?:;\\d{0,4})*)?[\\dA-PR-TZcf-nq-uy=><~]))',
  ].join('|');

  return new RegExp(pattern, onlyFirst ? undefined : 'g');
}

function stripAnsi(string) {
  if (typeof string !== 'string') {
    throw new TypeError(`Expected a \`string\`, got \`${typeof string}\``);
  }

  // Even though the regex is global, we don't need to reset the `.lastIndex`
  // because unlike `.exec()` and `.test()`, `.replace()` does it automatically
  // and doing it manually has a performance penalty.
  const regex = ansiRegex();
  return string.replace(regex, '');
}

module.exports = stripAnsi;