var ReactElement = function(type, key, ref, self, source, owner, props) { var element = { // This tag allow us to uniquely identify this as a React Element $$typeof: REACT_ELEMENT_TYPE,
// Built-in properties that belong on the element type: type, key: key, ref: ref, props: props,
// Record the component responsible for creating this element. _owner: owner, };
if (__DEV__) { // The validation flag is currently mutative. We put it on // an external backing store so that we can freeze the whole object. // This can be replaced with a WeakMap once they are implemented in // commonly used development environments. element._store = {};
// To make comparing ReactElements easier for testing purposes, we make // the validation flag non-enumerable (where possible, which should // include every environment we run tests in), so the test framework // ignores it. Object.defineProperty(element._store, 'validated', { configurable: false, enumerable: false, writable: true, value: false, }); // self and source are DEV only properties. Object.defineProperty(element, '_self', { configurable: false, enumerable: false, writable: false, value: self, }); // Two elements created in two different places should be considered // equal for testing purposes and therefore we hide it from enumeration. Object.defineProperty(element, '_source', { configurable: false, enumerable: false, writable: false, value: source, }); if (Object.freeze) { Object.freeze(element.props); Object.freeze(element); } }
ReactElement.createFactory = function(type) { var factory = ReactElement.createElement.bind(null, type); // Expose the type on the factory and the prototype so that it can be // easily accessed on elements. E.g. `<Foo />.type === Foo`. // This should not be named `constructor` since this may not be the function // that created the element, and it may not even be a constructor. // Legacy hook TODO: Warn if this is accessed factory.type = type; return factory; };