Function emitExperimentalWarning

lib/internal/util.js:323–331

* @param {string} feature Feature name used in the warning message * @param {string} messagePrefix Prefix of the warning message * @param {string} code See documentation of process.emitWarning * @param {string} ctor See documentation of process.emitWarning

(feature, messagePrefix, code, ctor)

 * @param {string} ctor See documentation of process.emitWarning
 */
function emitExperimentalWarning(feature, messagePrefix, code, ctor) {
  if (experimentalWarnings.has(feature)) return;
  experimentalWarnings.add(feature);
  let msg = `${feature} is an experimental feature and might change at any time`;
  if (messagePrefix) {
    msg = messagePrefix + msg;
  }
  process.emitWarning(msg, 'ExperimentalWarning', code, ctor);
}

function filterDuplicateStrings(items, low) {
  const map = new SafeMap();