util-ex/lib/is/string/identifier.js

Browser-friendly enhanced util fully compatible with standard node.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
exports.isIdentifier = isIdentifier;
/**
 * Determines if a string is a valid JavaScript identifier.
 *
 * @param {string} str - The string to check.
 * @param {object} [options] - The options for checking.
 * @param {boolean} [options.allowAsync=false] - Whether to support 'async ' prefix.
 * @returns {boolean} - True if the string is a valid identifier, false otherwise.
 */
function isIdentifier(str, options) {
  if (typeof str !== 'string') return false;
  const allowAsync = options && options.allowAsync;
  const regex = allowAsync ? /^(async\s+)?([a-zA-Z_$][0-9a-zA-Z_$]*)$/ : /^([a-zA-Z_$][0-9a-zA-Z_$]*)$/;
  return regex.test(str);
}
var _default = exports.default = isIdentifier;