mirror of
https://github.com/zebrajr/react.git
synced 2025-12-07 12:20:38 +01:00
9ea55516e6
* Replace unstable_AsyncComponent with Unstable_AsyncMode Mirrors the StrictMode API and uses the new Mode type of work. * internalContextTag -> mode Change this now that we have a better name * Unstable_ -> unstable_
55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
/**
|
|
* Copyright (c) 2013-present, Facebook, Inc.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*
|
|
* @flow
|
|
*/
|
|
|
|
// The Symbol used to tag the ReactElement-like types. If there is no native Symbol
|
|
// nor polyfill, then a plain number is used for performance.
|
|
const hasSymbol = typeof Symbol === 'function' && Symbol.for;
|
|
|
|
export const REACT_ELEMENT_TYPE = hasSymbol
|
|
? Symbol.for('react.element')
|
|
: 0xeac7;
|
|
export const REACT_CALL_TYPE = hasSymbol ? Symbol.for('react.call') : 0xeac8;
|
|
export const REACT_RETURN_TYPE = hasSymbol
|
|
? Symbol.for('react.return')
|
|
: 0xeac9;
|
|
export const REACT_PORTAL_TYPE = hasSymbol
|
|
? Symbol.for('react.portal')
|
|
: 0xeaca;
|
|
export const REACT_FRAGMENT_TYPE = hasSymbol
|
|
? Symbol.for('react.fragment')
|
|
: 0xeacb;
|
|
export const REACT_STRICT_MODE_TYPE = hasSymbol
|
|
? Symbol.for('react.strict_mode')
|
|
: 0xeacc;
|
|
export const REACT_PROVIDER_TYPE = hasSymbol
|
|
? Symbol.for('react.provider')
|
|
: 0xeacd;
|
|
export const REACT_CONTEXT_TYPE = hasSymbol
|
|
? Symbol.for('react.context')
|
|
: 0xeace;
|
|
export const REACT_ASYNC_MODE_TYPE = hasSymbol
|
|
? Symbol.for('react.async_mode')
|
|
: 0xeacf;
|
|
|
|
const MAYBE_ITERATOR_SYMBOL = typeof Symbol === 'function' && Symbol.iterator;
|
|
const FAUX_ITERATOR_SYMBOL = '@@iterator';
|
|
|
|
export function getIteratorFn(maybeIterable: ?any): ?() => ?Iterator<*> {
|
|
if (maybeIterable === null || typeof maybeIterable === 'undefined') {
|
|
return null;
|
|
}
|
|
const maybeIterator =
|
|
(MAYBE_ITERATOR_SYMBOL && maybeIterable[MAYBE_ITERATOR_SYMBOL]) ||
|
|
maybeIterable[FAUX_ITERATOR_SYMBOL];
|
|
if (typeof maybeIterator === 'function') {
|
|
return maybeIterator;
|
|
}
|
|
return null;
|
|
}
|