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Add definitions for new debug hook useDebugValue #7356

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Add definitions for new debug hook useDebugValue #7356

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8041867
Add definitions for new debug hook useDebugValue
Jan 15, 2019
2ea796e
Added optional formatting function param
Jan 17, 2019
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5 changes: 5 additions & 0 deletions lib/react.js
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Original file line number Diff line number Diff line change
Expand Up @@ -321,6 +321,11 @@ declare module react {

declare export function useRef<T>(initialValue: ?T): {current: T | null};

declare export function useDebugValue(
value: any,
formatterFn: ?(value: any) => any,
): void;

declare export function useEffect(
create: () => MaybeCleanUpFn,
inputs: ?$ReadOnlyArray<mixed>,
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26 changes: 26 additions & 0 deletions tests/react/useDebugValue_hook.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
// @flow

import React from 'react';

{
// Accepts any type of value
React.useDebugValue('abc');
React.useDebugValue(123);
React.useDebugValue(true);
React.useDebugValue(['a','b','c']);
React.useDebugValue({foo: 1, bar: 2});
}

{
// Has an undefined return type
((React.useDebugValue(123)): typeof undefined);
}

{
// Supports optional formatting function
const date = new Date();
React.useDebugValue(
date,
date => date.toDateString(),
);
}