/** biome-ignore-all lint/suspicious/noExplicitAny: <> */
import type { AnyRecord } from '@chzky/core';
/** ## `merge` : 对象深度合并  `target` <- `source`
将`source`的数据合并进`target`中
@example
```ts
    // 基本对象合并
    const target = { a: 1, b: { x: 1, y: 2 } }
    const source = { b: { y: 3, z: 4 }, c: 5 }
    const result = merge(target, source)
    assert.equal(result, { a: 1, b: { x: 1, y: 3, z: 4 }, c: 5 })
    assert.equal(target, { a: 1, b: { x: 1, y: 2 } })

    // 数组index合并
    const array_target = { a: [1, 2], b: { x: 1 } }
    const array_source = { a: [3], b: { y: 2 } }
    const array_result = merge(array_target, array_source)
    console.log(array_result)
    assert.equal(array_result, { a: [3, 2], b: { x: 1, y: 2 } }) //[1]被[3]替换了
    assert.equal(array_target, { a: [1, 2], b: { x: 1 } })

    // null 值也会被适当处理
    const null_target = { a: null }
    const null_source = { a: [1, 2, 3] }
    const null_result = merge(null_target, null_source)
    assert.equal(null_result, { a: [1, 2, 3] })
    assert.equal(null_target, { a: null })
```
@category Collect
 */
export declare function merge<T extends AnyRecord, K extends AnyRecord>(target: T, source: K): T & K;
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