/**
 * @module Resilience
 */
import { type MiddlewareFn } from "../../../middleware/contracts/_module.js";
import { type Invocable, type AsyncLazyable, type ErrorPolicySettings } from "../../../utilities/_module.js";
/**
 * IMPORT_PATH: `"@daiso-tech/core/resilience"`
 * @group Middlewares
 */
export type OnFallbackData<TParameters extends Array<unknown> = Array<unknown>, TFallbackValue = unknown> = {
    error: unknown;
    fallbackValue: TFallbackValue;
    args: TParameters;
};
/**
 * IMPORT_PATH: `"@daiso-tech/core/resilience"`
 * @group Middlewares
 */
export type OnFallback<TParameters extends Array<unknown> = Array<unknown>, TFallbackValue = unknown> = Invocable<[data: OnFallbackData<TParameters, TFallbackValue>]>;
/**
 * Lifecycle callbacks for the `fallback` middleware.
 * Called when the fallback value is about to be returned instead of the original result.
 *
 * IMPORT_PATH: `"@daiso-tech/core/resilience"`
 * @group Middlewares
 */
export type FallbackCallbacks<TParameters extends Array<unknown> = Array<unknown>, TReturn = unknown> = {
    /**
     * Callback {@link Invocable | `Invocable`} that will be called before fallback value is returned.
     */
    onFallback?: OnFallback<TParameters, TReturn>;
};
/**
 * Configuration for the `fallback` resilience middleware.
 * Returns a default value when the wrapped function throws or returns a value matching the error policy.
 * Supports error-policy filtering to only catch specific errors.
 *
 * IMPORT_PATH: `"@daiso-tech/core/resilience"`
 * @group Middlewares
 */
export type FallbackSettings<TParameters extends Array<unknown> = Array<unknown>, TReturn = unknown> = FallbackCallbacks<TParameters, TReturn> & ErrorPolicySettings & {
    fallbackValue: AsyncLazyable<TReturn>;
};
/**
 * IMPORT_PATH: `"@daiso-tech/core/resilience"`
 * @group Middlewares
 */
export declare function fallback<TParameters extends Array<unknown>, TReturn>(settings: NoInfer<FallbackSettings<TParameters, TReturn>>): MiddlewareFn<TParameters, Promise<TReturn>>;