import type { DataSourceFn } from '../data-source.types';
import type { DataSourceFnBuilder } from './data-source-fn-builder.types';
import type { WithFn } from './with-fn.types';
/**
 * Instantiates a DataSourceFnBuilder from a given function.
 *
 * @param fn - Any function that takes a single parameter and returns a value or a Promise with a value
 * @return A DataSourceFnBuilder with the provided `fn` assigned
 */
export declare const dataSourceFnBuilder: <OutputType, InputType>(fn: DataSourceFn<OutputType, InputType>) => DataSourceFnBuilder & import("./data-source-fn-builder.types").WithInputType<InputType> & import("./with-map-input.types").WithMapInputFromType<never> & import("./with-map-output.types").WithMapOutputToType<never> & import("./data-source-fn-builder.types").WithOutputType<OutputType> & {
    fn: DataSourceFn<OutputType, InputType>;
};