Function validateDangerousTag

docs/lib/react.js:6631–6636

(tag)

var hasOwnProperty = {}.hasOwnProperty;

function validateDangerousTag(tag) {
  if (!hasOwnProperty.call(validatedTagCache, tag)) {
    !VALID_TAG_REGEX.test(tag) ? "development" !== 'production' ? invariant(false, 'Invalid tag: %s', tag) : invariant(false) : void 0;
    validatedTagCache[tag] = true;
  }
}

function isCustomComponent(tagName, props) {
  return tagName.indexOf('-') >= 0 || props.is != null;