Function generateValidRegex

packages/cli/lib/utils.js:50–71

* Returns a valid variable name regex; * taken from https://gist.github.com/mathiasbynens/6334847

()

 * taken from https://gist.github.com/mathiasbynens/6334847
 */
function generateValidRegex() {
  const get = function (what) {
    return require('@unicode/unicode-10.0.0/' + what + '/code-points.js');
  };
  const idStart = get('Binary_Property/ID_Start');
  const idContinue = get('Binary_Property/ID_Continue');
  const compileRegex = _.template(
    '^(?:<%= identifierStart %>)(?:<%= identifierPart %>)*$',
  );
  const identifierStart = regenerate(idStart).add('$', '_');
  const identifierPart = regenerate(idContinue).add(
    '$',
    '_',
    '\u200C',
    '\u200D',
  );
  const regex = compileRegex({
    identifierStart: identifierStart.toString(),
    identifierPart: identifierPart.toString(),
  });
  return new RegExp(regex);
}
const validRegex = generateValidRegex();
exports.validRegex = validRegex;