/** ## `each_each` : 双循环
+ 将双层数组每项目进行遍历
@example Usage
```ts
  const arr = [
    { age: 19, name: ['a', 'b', 'c'] },
    { age: 19, name: ['d', 'e', 'f'] },
  ]

  const sequence = assert_sequence()

  each_each(arr, 'name', (_fa, _it, allindex, lineindex) => {
    sequence(allindex + 1)
    assert(within(0, 4)(lineindex))
  })
```
@category Collect
 */
export declare function each_each<T extends object, V, Name extends string>(arr: Array<T & {
    [K in Name]: Array<V>;
}>, key: Name, cb: (father: T, item: V, 
/** `index` : 位于循环总体的偏移值 */
index: number, 
/** `lineindex` : 位于当前循环的偏移值 */
lineindex: number) => unknown): void;
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