```typescript

type column<T> = T extends 'select' ? { xSearchType: T, xSearchItems: any[] } : { xSearchType: T }

let c: column<'select'> = {
xSearchType: 'select',
xSearchItems: [],
}

let n: column<'input'> = {
xSearchType: 'input',
}


```

暂时想到这样写，不过感觉还有更简洁的方法。