bc518174
 王天杨
提交两个项目文件
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// @flow strict
import * as React from 'react';
import { type Ref } from './RefTypes';
/**
* Takes an argument and if it's an array, returns the first item in the array,
* otherwise returns the argument. Used for Preact compatibility.
*/
export const unwrapArray = (arg: *): * => (Array.isArray(arg) ? arg[0] : arg);
/**
* Takes a maybe-undefined function and arbitrary args and invokes the function
* only if it is defined.
*/
export const safeInvoke = <F: Function>(
fn: ?F,
...args: Array<mixed>
): $Call<F> => {
if (typeof fn === 'function') {
return fn(...args);
}
};
/**
* Sets a ref using either a ref callback or a ref object
*/
export const setRef = (ref: ?Ref, node: ?HTMLElement): void => {
// if its a function call it
if (typeof ref === 'function') {
return safeInvoke(ref, node);
}
// otherwise we should treat it as a ref object
else if (ref != null) {
ref.current = node;
}
};
/**
* Simple ponyfill for Object.fromEntries
*/
export const fromEntries = (
entries: Array<[string, any]>
): { [key: string]: any } =>
entries.reduce((acc, [key, value]) => {
acc[key] = value;
return acc;
}, {});
/**
* Small wrapper around `useLayoutEffect` to get rid of the warning on SSR envs
*/
export const useIsomorphicLayoutEffect:
| typeof React.useEffect
| typeof React.useLayoutEffect =
typeof window !== 'undefined' &&
window.document &&
window.document.createElement
? React.useLayoutEffect
: React.useEffect;
|
