import { AsyncResult } from "./async_result";
import { type Result } from "./result";
import type { InferErr } from "./util";
/**
 * Runs a generator function that returns a `Result` and infers its return type as `Result<T, E>`.
 *
 * `yield*` must be used to yield the result of a `Result`.
 *
 * **Examples**
 *
 * ```ts
 * // $ExpectType Result<number, string>
 * const result = tryFn(function* () {
 *   const a = yield* Ok(1)
 *   const random = Math.random()
 *   if (random > 0.5) {
 *     yield* Err("error")
 *   }
 *   return a + random
 * })
 * ```
 */
export declare function trySync<T extends Result<any, any>, U>(fn: () => Generator<T, U, any>): Result<U, InferErr<T>>;
/**
 * Runs an async generator function that returns a `Result` and infers its return type as `AsyncResult<T, E>`.
 *
 * `yield*` must be used to yield the result of a `AsyncResult` or `Result`.
 *
 * **Examples**
 *
 * ```ts
 * const okOne = () => new AsyncResult(Promise.resolve(Ok(1)))
 *
 * // $ExpectType AsyncResult<number, string>
 * const result = tryAsyncFn(async function* () {
 *   const a = yield* okOne()
 *   const random = Math.random()
 *   if (random > 0.5) {
 *     yield* Err("error")
 *   }
 *   return a + random
 * })
 * ```
 */
export declare function tryAsync<T extends AsyncResult<any, any> | Result<any, any>, U>(fn: () => AsyncGenerator<T, U, any>): AsyncResult<U, InferErr<Awaited<T>>>;