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 王天杨
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import * as React from 'react';
import { isValidElementType } from 'react-is';
// https://github.com/sindresorhus/is-plain-obj/blob/main/index.js
export function isPlainObject(item) {
if (typeof item !== 'object' || item === null) {
return false;
}
const prototype = Object.getPrototypeOf(item);
return (prototype === null || prototype === Object.prototype || Object.getPrototypeOf(prototype) === null) && !(Symbol.toStringTag in item) && !(Symbol.iterator in item);
}
function deepClone(source) {
if (/*#__PURE__*/React.isValidElement(source) || isValidElementType(source) || !isPlainObject(source)) {
return source;
}
const output = {};
Object.keys(source).forEach(key => {
output[key] = deepClone(source[key]);
});
return output;
}
/**
* Merge objects deeply.
* It will shallow copy React elements.
*
* If `options.clone` is set to `false` the source object will be merged directly into the target object.
*
* @example
* ```ts
* deepmerge({ a: { b: 1 }, d: 2 }, { a: { c: 2 }, d: 4 });
* // => { a: { b: 1, c: 2 }, d: 4 }
* ````
*
* @param target The target object.
* @param source The source object.
* @param options The merge options.
* @param options.clone Set to `false` to merge the source object directly into the target object.
* @returns The merged object.
*/
export default function deepmerge(target, source, options = {
clone: true
}) {
const output = options.clone ? {
...target
} : target;
if (isPlainObject(target) && isPlainObject(source)) {
Object.keys(source).forEach(key => {
if (/*#__PURE__*/React.isValidElement(source[key]) || isValidElementType(source[key])) {
output[key] = source[key];
} else if (isPlainObject(source[key]) &&
// Avoid prototype pollution
Object.prototype.hasOwnProperty.call(target, key) && isPlainObject(target[key])) {
// Since `output` is a clone of `target` and we have narrowed `target` in this block we can cast to the same type.
output[key] = deepmerge(target[key], source[key], options);
} else if (options.clone) {
output[key] = isPlainObject(source[key]) ? deepClone(source[key]) : source[key];
} else {
output[key] = source[key];
}
});
}
return output;
}
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