Function toString

lib/internal/webidl.js:294–310

* Returns ToString(V). * @see https://tc39.es/ecma262/#sec-tostring * @param {any} V JavaScript value. * @param {ConversionOptions} [options] Conversion options. * @returns {string}

(V, options = kEmptyObject)

 * @returns {string}
 */
function toString(V, options = kEmptyObject) {
  if (typeof V === 'symbol') {
    // ECMA-262 ToString step 2: Symbol values throw.
    throw makeException(
      'is a Symbol and cannot be converted to a string.',
      options);
  }

  // The String function performs ToString for all non-Symbol primitives and
  // objects, including ToPrimitive(V, string). String concatenation is not
  // equivalent because it uses ToPrimitive(V, default). Abrupt completions
  // and native TypeErrors propagate unchanged. This is an intentional
  // diagnostics tradeoff: decorating object conversion failures would require
  // maintaining local ECMA-262 ToPrimitive and OrdinaryToPrimitive
  // implementations.
  return String(V);
}

/**
 * Converts a JavaScript value to a Web IDL integer value.