import { type Option, type Vector } from '../../mod.js';
/** ## ## Peekable : 可提前`前瞻`iterable下一个数据
由于iterable具有一次消耗性,调用next()之后就无法返回.Peekable能提前`看`下一个数据,能解决这一问题场景
@example Uasge
```ts
  const arr: Iterable<number> = [1, 2, 33, 4, 5]
  const peek = new Peekable(arr)

  assert(peek.next().unwrap() === 1)

  assert(peek.peeked.unwrap() === 2)

  assert(peek.peeked.unwrap() == peek.next().unwrap())
  assert(peek.next().unwrap() !== peek.peeked.unwrap())
```
@category Class
 */
export declare class Peekable<V, T extends Iterable<V> | Iterator<V>> {
    private iter;
    private peek_value;
    private peek_data;
    constructor(iter: T, itable?: boolean);
    get peeked(): Option<V>;
    next(): Option<V>;
    from<I>(val: Vector<I>): Peekable<I, Iterator<I>>;
}
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