import type { Validator } from "../util/validate.js";
/**
 * An abstract API resource definition, used to specify types for e.g. serverless functions..
 *
 * @param name The name of the resource, e.g. `getUser`.
 * @param payload The `Validator` the resource's payload must conform to (defaults to `undefined` if not specified).
 * @param returns The `Validator` the resource's returned value must conform to (defaults to `undefined` if not specified).
 */
export declare class Resource<P = undefined, R = void> implements Validator<R> {
    /** Resource name.. */
    readonly name: string;
    /** Payload validator. */
    readonly payload: Validator<P>;
    /** Result validator. */
    readonly result: Validator<R>;
    constructor(name: string, payload: Validator<P>, result: Validator<R>);
    constructor(name: string, payload: Validator<P>);
    constructor(name: string);
    /**
     * Validate a payload for this resource.
     *
     * @returns The validated payload for this resource.
     * @throws Feedback if the payload could not be validated.
     */
    prepare(unsafePayload: unknown): P;
    /**
     * Validate a result for this resource.
     *
     * @returns The validated result for this resource.
     * @throws ValueError if the result could not be validated.
     */
    validate(unsafeResult: unknown): R;
}
/** Extract the payload type from a `Resource`. */
export type PayloadType<X extends Resource> = X extends Resource<infer Y, unknown> ? Y : never;
/** Extract the result type from a `Resource`. */
export type ResourceType<X extends Resource> = X extends Resource<unknown, infer Y> ? Y : never;