mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Sebastian Markbåge
65bbda7f16
Sounds like this is the name we're going with. This also helps us distinguish it from other "chunking" implementation details.
78 lines
2.6 KiB
JavaScript
78 lines
2.6 KiB
JavaScript
/**
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* 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_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_PROFILER_TYPE = hasSymbol
|
|
? Symbol.for('react.profiler')
|
|
: 0xead2;
|
|
export const REACT_PROVIDER_TYPE = hasSymbol
|
|
? Symbol.for('react.provider')
|
|
: 0xeacd;
|
|
export const REACT_CONTEXT_TYPE = hasSymbol
|
|
? Symbol.for('react.context')
|
|
: 0xeace;
|
|
// TODO: We don't use AsyncMode or ConcurrentMode anymore. They were temporary
|
|
// (unstable) APIs that have been removed. Can we remove the symbols?
|
|
export const REACT_ASYNC_MODE_TYPE = hasSymbol
|
|
? Symbol.for('react.async_mode')
|
|
: 0xeacf;
|
|
export const REACT_CONCURRENT_MODE_TYPE = hasSymbol
|
|
? Symbol.for('react.concurrent_mode')
|
|
: 0xeacf;
|
|
export const REACT_FORWARD_REF_TYPE = hasSymbol
|
|
? Symbol.for('react.forward_ref')
|
|
: 0xead0;
|
|
export const REACT_SUSPENSE_TYPE = hasSymbol
|
|
? Symbol.for('react.suspense')
|
|
: 0xead1;
|
|
export const REACT_SUSPENSE_LIST_TYPE = hasSymbol
|
|
? Symbol.for('react.suspense_list')
|
|
: 0xead8;
|
|
export const REACT_MEMO_TYPE = hasSymbol ? Symbol.for('react.memo') : 0xead3;
|
|
export const REACT_LAZY_TYPE = hasSymbol ? Symbol.for('react.lazy') : 0xead4;
|
|
export const REACT_BLOCK_TYPE = hasSymbol ? Symbol.for('react.block') : 0xead9;
|
|
export const REACT_FUNDAMENTAL_TYPE = hasSymbol
|
|
? Symbol.for('react.fundamental')
|
|
: 0xead5;
|
|
export const REACT_RESPONDER_TYPE = hasSymbol
|
|
? Symbol.for('react.responder')
|
|
: 0xead6;
|
|
export const REACT_SCOPE_TYPE = hasSymbol ? Symbol.for('react.scope') : 0xead7;
|
|
|
|
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 !== 'object') {
|
|
return null;
|
|
}
|
|
const maybeIterator =
|
|
(MAYBE_ITERATOR_SYMBOL && maybeIterable[MAYBE_ITERATOR_SYMBOL]) ||
|
|
maybeIterable[FAUX_ITERATOR_SYMBOL];
|
|
if (typeof maybeIterator === 'function') {
|
|
return maybeIterator;
|
|
}
|
|
return null;
|
|
}
|