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c0cf7c696c
So that when we end up referring to it in more places, it's only one. We don't do this same pattern for regular `Symbol.iterator` because we also support the string `"@@iterator"` for backwards compatibility.
65 lines
2.5 KiB
JavaScript
65 lines
2.5 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and 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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// The Symbol used to tag the ReactElement-like types.
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export const REACT_ELEMENT_TYPE: symbol = Symbol.for('react.element');
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export const REACT_PORTAL_TYPE: symbol = Symbol.for('react.portal');
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export const REACT_FRAGMENT_TYPE: symbol = Symbol.for('react.fragment');
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export const REACT_STRICT_MODE_TYPE: symbol = Symbol.for('react.strict_mode');
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export const REACT_PROFILER_TYPE: symbol = Symbol.for('react.profiler');
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export const REACT_PROVIDER_TYPE: symbol = Symbol.for('react.provider'); // TODO: Delete with enableRenderableContext
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export const REACT_CONSUMER_TYPE: symbol = Symbol.for('react.consumer');
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export const REACT_CONTEXT_TYPE: symbol = Symbol.for('react.context');
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export const REACT_FORWARD_REF_TYPE: symbol = Symbol.for('react.forward_ref');
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export const REACT_SUSPENSE_TYPE: symbol = Symbol.for('react.suspense');
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export const REACT_SUSPENSE_LIST_TYPE: symbol = Symbol.for(
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'react.suspense_list',
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);
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export const REACT_MEMO_TYPE: symbol = Symbol.for('react.memo');
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export const REACT_LAZY_TYPE: symbol = Symbol.for('react.lazy');
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export const REACT_SCOPE_TYPE: symbol = Symbol.for('react.scope');
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export const REACT_DEBUG_TRACING_MODE_TYPE: symbol = Symbol.for(
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'react.debug_trace_mode',
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);
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export const REACT_OFFSCREEN_TYPE: symbol = Symbol.for('react.offscreen');
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export const REACT_LEGACY_HIDDEN_TYPE: symbol = Symbol.for(
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'react.legacy_hidden',
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);
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export const REACT_TRACING_MARKER_TYPE: symbol = Symbol.for(
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'react.tracing_marker',
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);
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export const REACT_MEMO_CACHE_SENTINEL: symbol = Symbol.for(
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'react.memo_cache_sentinel',
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);
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export const REACT_POSTPONE_TYPE: symbol = Symbol.for('react.postpone');
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const MAYBE_ITERATOR_SYMBOL = Symbol.iterator;
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const FAUX_ITERATOR_SYMBOL = '@@iterator';
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export function getIteratorFn(maybeIterable: ?any): ?() => ?Iterator<any> {
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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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export const ASYNC_ITERATOR = Symbol.asyncIterator;
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