mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Brian Vaughn
fc3777b1fe
Add a new component type, Profiler, that can be used to collect new render time metrics. Since this is a new, experimental API, it will be exported as React.unstable_Profiler initially. Most of the functionality for this component has been added behind a feature flag, enableProfileModeMetrics. When the feature flag is disabled, the component will just render its children with no additional behavior. When the flag is enabled, React will also collect timing information and pass it to the onRender function (as described below).
102 lines
2.7 KiB
JavaScript
102 lines
2.7 KiB
JavaScript
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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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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'use strict';
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import {
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REACT_ASYNC_MODE_TYPE,
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REACT_CONTEXT_TYPE,
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REACT_ELEMENT_TYPE,
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REACT_FORWARD_REF_TYPE,
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REACT_FRAGMENT_TYPE,
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REACT_PORTAL_TYPE,
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REACT_PROFILER_TYPE,
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REACT_PROVIDER_TYPE,
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REACT_STRICT_MODE_TYPE,
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} from 'shared/ReactSymbols';
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import isValidElementType from 'shared/isValidElementType';
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export function typeOf(object: any) {
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if (typeof object === 'object' && object !== null) {
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const $$typeof = object.$$typeof;
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switch ($$typeof) {
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case REACT_ELEMENT_TYPE:
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const type = object.type;
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switch (type) {
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case REACT_ASYNC_MODE_TYPE:
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case REACT_FRAGMENT_TYPE:
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case REACT_PROFILER_TYPE:
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case REACT_STRICT_MODE_TYPE:
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return type;
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default:
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const $$typeofType = type && type.$$typeof;
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switch ($$typeofType) {
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case REACT_CONTEXT_TYPE:
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case REACT_FORWARD_REF_TYPE:
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case REACT_PROVIDER_TYPE:
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return $$typeofType;
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default:
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return $$typeof;
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}
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}
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case REACT_PORTAL_TYPE:
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return $$typeof;
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}
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}
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return undefined;
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}
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export const AsyncMode = REACT_ASYNC_MODE_TYPE;
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export const ContextConsumer = REACT_CONTEXT_TYPE;
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export const ContextProvider = REACT_PROVIDER_TYPE;
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export const Element = REACT_ELEMENT_TYPE;
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export const ForwardRef = REACT_FORWARD_REF_TYPE;
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export const Fragment = REACT_FRAGMENT_TYPE;
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export const Profiler = REACT_PROFILER_TYPE;
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export const Portal = REACT_PORTAL_TYPE;
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export const StrictMode = REACT_STRICT_MODE_TYPE;
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export {isValidElementType};
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export function isAsyncMode(object: any) {
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return typeOf(object) === REACT_ASYNC_MODE_TYPE;
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}
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export function isContextConsumer(object: any) {
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return typeOf(object) === REACT_CONTEXT_TYPE;
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}
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export function isContextProvider(object: any) {
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return typeOf(object) === REACT_PROVIDER_TYPE;
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}
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export function isElement(object: any) {
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return (
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typeof object === 'object' &&
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object !== null &&
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object.$$typeof === REACT_ELEMENT_TYPE
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);
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}
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export function isForwardRef(object: any) {
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return typeOf(object) === REACT_FORWARD_REF_TYPE;
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}
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export function isFragment(object: any) {
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return typeOf(object) === REACT_FRAGMENT_TYPE;
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}
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export function isProfiler(object: any) {
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return typeOf(object) === REACT_PROFILER_TYPE;
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}
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export function isPortal(object: any) {
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return typeOf(object) === REACT_PORTAL_TYPE;
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}
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export function isStrictMode(object: any) {
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return typeOf(object) === REACT_STRICT_MODE_TYPE;
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}
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