react-performance-testing/dist/src/utils/symbols.d.ts

You can test React(ReactNative) runtime performance by using this lib. If you want to check the number of renders, or render time in a test environment, this lib makes sense.

/**
 * Copied from ReactSymbols.js
 * https://github.com/facebook/react/blob/master/packages/shared/ReactSymbols.js
 */
export declare type ReactSymbol = Symbol | number;
export declare let REACT_MEMO_TYPE: ReactSymbol;
export declare let REACT_FORWARD_REF_TYPE: ReactSymbol;
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