import type { DataSourceResultFnFailure } from '../data-source.types';
import type { DataSourceFnBuilder } from './data-source-fn-builder.types';
import type { WithOnFailure } from './with-on-failure.types';
/**
 * Adds an onFailureFn and corresponding types to a DataSourceFnBuilder.
 * When the function is called and fails, the onFailureFn will also
 * be called. This is intended for side effects. Errors thrown in the
 * onFailureFn will be caught and won't override the error of the fn itself.
 *
 * @param onFailureFn - Called after the built function is called and fails
 * @return void
 */
export declare const withOnFailure: (onFailureFn: (failure: DataSourceResultFnFailure) => void) => <BuilderType extends DataSourceFnBuilder>(builder: BuilderType) => BuilderType & import("./with-on-failure.types").WithOnFailureFn;
/**
 * A type guard to determine if a builder has an onFailureFn.
 *
 * @param builder - Any DataSourceFnBuilder
 * @return boolean
 */
export declare const hasOnFailureFn: <BuilderType>(builder?: BuilderType | undefined) => builder is BuilderType & import("./with-on-failure.types").WithOnFailureFn;