import type { Either, Fns, Option, Result, State } from '../../mod.js';
/** ## is_async_func : 运行时判断函是否是 async函数
@tips 只能判断
      1. 一个函数是否带`async`关键字，不能判断函数是否返回Promise(函数返回只能在运行时判断)
@example
```ts
  const sync = (x: number) => x + 1
  const asyncfn = async (x: number) =>
    new Promise(res => {
      setTimeout(() => {
        res(x + 1)
      }, 1000)
    })
  assertEquals(is_async_func(asyncfn), true)
  assertEquals(is_async_func(sync), false)
```
@category Function
  */
export declare const is_async_func: (fn: Fns<any>) => fn is () => Promise<unknown>;
/** ## is_number : 运行时判断数据是否是数字
+ 包含两种情况判断为数字 :
  1. 数字 : 1,2,3,4,5... <包括Infinity,-Infinity;不包括NaN>
  2. 能转为数字的字符串: '1.1','2','114514'...

  @category Function
 */
export declare const is_number: (val: unknown) => boolean;
/** ## is_result : 运行时判断是否Result类型
  @example
  ```ts
  const res = result(() => {
    if (Math.random() > 0.5) {
      return 1
    } else {
      throw new Error('test error')
    }
  })
  console.log(is_result(res)) // true
  ```
  @category Function
*/
export declare function is_result<T = unknown, E = unknown>(val: unknown): val is Result<T, E>;
/** ## `is_option` : 运行时判断是否Option类型
  @category Function
 */
export declare function is_option<T = unknown>(val: unknown): val is Option<T>;
/** ## `is_either` : 运行时判断是否Either类型 */
export declare function is_either<T = unknown, E = unknown>(val: unknown): val is Either<T, E>;
/** ## `is_state` : 运行时判断是否State类型 */
export declare function is_state<M = unknown, S = unknown>(val: unknown): val is State<M, S>;
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