mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
94 lines
2.9 KiB
JavaScript
94 lines
2.9 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/
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// ATTENTION
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// When adding new symbols to this file,
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// Please consider also adding to 'react-devtools-shared/src/backend/ReactSymbols'
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import {enableSymbolFallbackForWWW} from './ReactFeatureFlags';
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const usePolyfill =
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enableSymbolFallbackForWWW && (typeof Symbol !== 'function' || !Symbol.for);
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// The Symbol used to tag the ReactElement-like types.
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export const REACT_ELEMENT_TYPE = usePolyfill
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? 0xeac7
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: Symbol.for('react.element');
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export const REACT_PORTAL_TYPE = usePolyfill
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? 0xeaca
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: Symbol.for('react.portal');
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export const REACT_FRAGMENT_TYPE = usePolyfill
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? 0xeacb
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: Symbol.for('react.fragment');
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export const REACT_STRICT_MODE_TYPE = usePolyfill
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? 0xeacc
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: Symbol.for('react.strict_mode');
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export const REACT_PROFILER_TYPE = usePolyfill
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? 0xead2
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: Symbol.for('react.profiler');
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export const REACT_PROVIDER_TYPE = usePolyfill
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? 0xeacd
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: Symbol.for('react.provider');
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export const REACT_CONTEXT_TYPE = usePolyfill
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? 0xeace
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: Symbol.for('react.context');
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export const REACT_SERVER_CONTEXT_TYPE = usePolyfill
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? 0xeae6
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: Symbol.for('react.server_context');
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export const REACT_FORWARD_REF_TYPE = usePolyfill
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? 0xead0
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: Symbol.for('react.forward_ref');
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export const REACT_SUSPENSE_TYPE = usePolyfill
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? 0xead1
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: Symbol.for('react.suspense');
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export const REACT_SUSPENSE_LIST_TYPE = usePolyfill
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? 0xead8
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: Symbol.for('react.suspense_list');
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export const REACT_MEMO_TYPE = usePolyfill ? 0xead3 : Symbol.for('react.memo');
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export const REACT_LAZY_TYPE = usePolyfill ? 0xead4 : Symbol.for('react.lazy');
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export const REACT_SCOPE_TYPE = usePolyfill
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? 0xead7
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: Symbol.for('react.scope');
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export const REACT_DEBUG_TRACING_MODE_TYPE = usePolyfill
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? 0xeae1
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: Symbol.for('react.debug_trace_mode');
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export const REACT_OFFSCREEN_TYPE = usePolyfill
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? 0xeae2
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: Symbol.for('react.offscreen');
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export const REACT_LEGACY_HIDDEN_TYPE = usePolyfill
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? 0xeae3
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: Symbol.for('react.legacy_hidden');
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export const REACT_CACHE_TYPE = usePolyfill
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? 0xeae4
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: Symbol.for('react.cache');
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export const REACT_TRACING_MARKER_TYPE = usePolyfill
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? 0xeae5
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: Symbol.for('react.tracing_marker');
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export const REACT_SERVER_CONTEXT_DEFAULT_VALUE_NOT_LOADED = usePolyfill
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? 0xeae7
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: Symbol.for('react.default_value');
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const MAYBE_ITERATOR_SYMBOL = usePolyfill
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? typeof Symbol === 'function' && Symbol.iterator
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: Symbol.iterator;
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const FAUX_ITERATOR_SYMBOL = '@@iterator';
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export function getIteratorFn(maybeIterable: ?any): ?() => ?Iterator<*> {
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if (maybeIterable === null || typeof maybeIterable !== 'object') {
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return null;
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}
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const maybeIterator =
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(MAYBE_ITERATOR_SYMBOL && maybeIterable[MAYBE_ITERATOR_SYMBOL]) ||
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maybeIterable[FAUX_ITERATOR_SYMBOL];
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if (typeof maybeIterator === 'function') {
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return maybeIterator;
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}
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return null;
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}
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