Function createElementWithValidation

code/composition/public/app.js:19719–19779

(type, props, children)

}

function createElementWithValidation(type, props, children) {
  var validType = typeof type === 'string' || typeof type === 'function' ||
  // Note: its typeof might be other than 'symbol' or 'number' if it's a polyfill.
  type === REACT_FRAGMENT_TYPE || type === REACT_ASYNC_MODE_TYPE || type === REACT_STRICT_MODE_TYPE || typeof type === 'object' && type !== null && (type.$$typeof === REACT_PROVIDER_TYPE || type.$$typeof === REACT_CONTEXT_TYPE || type.$$typeof === REACT_FORWARD_REF_TYPE);

  // We warn in this case but don't throw. We expect the element creation to
  // succeed and there will likely be errors in render.
  if (!validType) {
    var info = '';
    if (type === undefined || typeof type === 'object' && type !== null && Object.keys(type).length === 0) {
      info += ' You likely forgot to export your component from the file ' + "it's defined in, or you might have mixed up default and named imports.";
    }

    var sourceInfo = getSourceInfoErrorAddendum(props);
    if (sourceInfo) {
      info += sourceInfo;
    } else {
      info += getDeclarationErrorAddendum();
    }

    info += getStackAddendum() || '';

    var typeString = void 0;
    if (type === null) {
      typeString = 'null';
    } else if (Array.isArray(type)) {
      typeString = 'array';
    } else {
      typeString = typeof type;
    }

    warning(false, 'React.createElement: type is invalid -- expected a string (for ' + 'built-in components) or a class/function (for composite ' + 'components) but got: %s.%s', typeString, info);
  }

  var element = createElement.apply(this, arguments);

  // The result can be nullish if a mock or a custom function is used.
  // TODO: Drop this when these are no longer allowed as the type argument.
  if (element == null) {
    return element;
  }

  // Skip key warning if the type isn't valid since our key validation logic
  // doesn't expect a non-string/function type and can throw confusing errors.
  // We don't want exception behavior to differ between dev and prod.
  // (Rendering will throw with a helpful message and as soon as the type is
  // fixed, the key warnings will appear.)
  if (validType) {
    for (var i = 2; i < arguments.length; i++) {
      validateChildKeys(arguments[i], type);
    }
  }

  if (type === REACT_FRAGMENT_TYPE) {
    validateFragmentProps(element);
  } else {
    validatePropTypes(element);
  }