@samitouri / QOS-React-1
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1 /**
2 * Copyright (c) Meta Platforms, Inc. and affiliates.
3 *
4 * This source code is licensed under the MIT license found in the
5 * LICENSE file in the root directory of this source tree.
6 *
7 * @flow
8 */
9
10 'use strict';
11
12 import {
13 REACT_CONTEXT_TYPE,
14 REACT_ELEMENT_TYPE,
15 REACT_FORWARD_REF_TYPE,
16 REACT_FRAGMENT_TYPE,
17 REACT_LAZY_TYPE,
18 REACT_MEMO_TYPE,
19 REACT_PORTAL_TYPE,
20 REACT_PROFILER_TYPE,
21 REACT_CONSUMER_TYPE,
22 REACT_STRICT_MODE_TYPE,
23 REACT_SUSPENSE_TYPE,
24 REACT_SUSPENSE_LIST_TYPE,
25 REACT_VIEW_TRANSITION_TYPE,
26 REACT_SCOPE_TYPE,
27 REACT_LEGACY_HIDDEN_TYPE,
28 REACT_TRACING_MARKER_TYPE,
29 } from 'shared/ReactSymbols';
30
31 import {
32 enableScopeAPI,
33 enableTransitionTracing,
34 enableLegacyHidden,
35 enableViewTransition,
36 } from 'shared/ReactFeatureFlags';
37
38 const REACT_CLIENT_REFERENCE: symbol = Symbol.for('react.client.reference');
39
40 export function typeOf(object: any): mixed {
41 if (typeof object === 'object' && object !== null) {
42 const $$typeof = object.$$typeof;
43 switch ($$typeof) {
44 case REACT_ELEMENT_TYPE:
45 const type = object.type;
46
47 switch (type) {
48 case REACT_FRAGMENT_TYPE:
49 case REACT_PROFILER_TYPE:
50 case REACT_STRICT_MODE_TYPE:
51 case REACT_SUSPENSE_TYPE:
52 case REACT_SUSPENSE_LIST_TYPE:
53 case REACT_VIEW_TRANSITION_TYPE:
54 return type;
55 default:
56 const $$typeofType = type && type.$$typeof;
57
58 switch ($$typeofType) {
59 case REACT_CONTEXT_TYPE:
60 case REACT_FORWARD_REF_TYPE:
61 case REACT_LAZY_TYPE:
62 case REACT_MEMO_TYPE:
63 return $$typeofType;
64 case REACT_CONSUMER_TYPE:
65 return $$typeofType;
66 // Fall through
67 default:
68 return $$typeof;
69 }
70 }
71 case REACT_PORTAL_TYPE:
72 return $$typeof;
73 }
74 }
75
76 return undefined;
77 }
78
79 export const ContextConsumer: symbol = REACT_CONSUMER_TYPE;
80 export const ContextProvider: symbol = REACT_CONTEXT_TYPE;
81 export const Element = REACT_ELEMENT_TYPE;
82 export const ForwardRef = REACT_FORWARD_REF_TYPE;
83 export const Fragment = REACT_FRAGMENT_TYPE;
84 export const Lazy = REACT_LAZY_TYPE;
85 export const Memo = REACT_MEMO_TYPE;
86 export const Portal = REACT_PORTAL_TYPE;
87 export const Profiler = REACT_PROFILER_TYPE;
88 export const StrictMode = REACT_STRICT_MODE_TYPE;
89 export const Suspense = REACT_SUSPENSE_TYPE;
90 export const SuspenseList = REACT_SUSPENSE_LIST_TYPE;
91
92 export function isValidElementType(type: mixed): boolean {
93 if (typeof type === 'string' || typeof type === 'function') {
94 return true;
95 }
96
97 // Note: typeof might be other than 'symbol' or 'number' (e.g. if it's a polyfill).
98 if (
99 type === REACT_FRAGMENT_TYPE ||
100 type === REACT_PROFILER_TYPE ||
101 type === REACT_STRICT_MODE_TYPE ||
102 type === REACT_SUSPENSE_TYPE ||
103 type === REACT_SUSPENSE_LIST_TYPE ||
104 (enableLegacyHidden && type === REACT_LEGACY_HIDDEN_TYPE) ||
105 (enableScopeAPI && type === REACT_SCOPE_TYPE) ||
106 (enableTransitionTracing && type === REACT_TRACING_MARKER_TYPE) ||
107 (enableViewTransition && type === REACT_VIEW_TRANSITION_TYPE)
108 ) {
109 return true;
110 }
111
112 if (typeof type === 'object' && type !== null) {
113 if (
114 type.$$typeof === REACT_LAZY_TYPE ||
115 type.$$typeof === REACT_MEMO_TYPE ||
116 type.$$typeof === REACT_CONTEXT_TYPE ||
117 type.$$typeof === REACT_CONSUMER_TYPE ||
118 type.$$typeof === REACT_FORWARD_REF_TYPE ||
119 // This needs to include all possible module reference object
120 // types supported by any Flight configuration anywhere since
121 // we don't know which Flight build this will end up being used
122 // with.
123 type.$$typeof === REACT_CLIENT_REFERENCE ||
124 type.getModuleId !== undefined
125 ) {
126 return true;
127 }
128 }
129
130 return false;
131 }
132
133 export function isContextConsumer(object: any): boolean {
134 return typeOf(object) === REACT_CONSUMER_TYPE;
135 }
136 export function isContextProvider(object: any): boolean {
137 return typeOf(object) === REACT_CONTEXT_TYPE;
138 }
139 export function isElement(object: any): boolean {
140 return (
141 typeof object === 'object' &&
142 object !== null &&
143 object.$$typeof === REACT_ELEMENT_TYPE
144 );
145 }
146 export function isForwardRef(object: any): boolean {
147 return typeOf(object) === REACT_FORWARD_REF_TYPE;
148 }
149 export function isFragment(object: any): boolean {
150 return typeOf(object) === REACT_FRAGMENT_TYPE;
151 }
152 export function isLazy(object: any): boolean {
153 return typeOf(object) === REACT_LAZY_TYPE;
154 }
155 export function isMemo(object: any): boolean {
156 return typeOf(object) === REACT_MEMO_TYPE;
157 }
158 export function isPortal(object: any): boolean {
159 return typeOf(object) === REACT_PORTAL_TYPE;
160 }
161 export function isProfiler(object: any): boolean {
162 return typeOf(object) === REACT_PROFILER_TYPE;
163 }
164 export function isStrictMode(object: any): boolean {
165 return typeOf(object) === REACT_STRICT_MODE_TYPE;
166 }
167 export function isSuspense(object: any): boolean {
168 return typeOf(object) === REACT_SUSPENSE_TYPE;
169 }
170 export function isSuspenseList(object: any): boolean {
171 return typeOf(object) === REACT_SUSPENSE_LIST_TYPE;
172 }