import { type Schema } from "../../schema/Schema.js";
import type { ImmutableArray } from "../../util/array.js";
import { type Data } from "../../util/data.js";
import type { AnyCaller } from "../../util/function.js";
import type { RequestMethod, RequestParams } from "../../util/http.js";
import type { AbsolutePath } from "../../util/path.js";
import { type TemplatePlaceholders } from "../../util/template.js";
import type { EndpointCallback, EndpointHandler } from "./util.js";
/**
 * An abstract API resource definition, used to specify types for e.g. serverless functions.
 *
 * @param method The method of the endpoint, e.g. `GET`
 * @param path Endpoint path, possibly including placeholders e.g. `/users/{id}`
 * @param payload A `Schema` for the payload of the endpoint.
 * @param result A `Schema` for the result of the endpoint.
 */
export declare class Endpoint<P = unknown, R = unknown> {
    /** Endpoint method. */
    readonly method: RequestMethod;
    /** Endpoint path, possibly including placeholders e.g. `/users/{id}` */
    readonly path: AbsolutePath;
    /** Endpoint path, possibly including placeholders e.g. `/users/{id}` */
    readonly placeholders: TemplatePlaceholders;
    /** Payload schema. */
    readonly payload: Schema<P>;
    /** Result schema. */
    readonly result: Schema<R>;
    constructor(method: RequestMethod, path: AbsolutePath, payload: Schema<P>, result: Schema<R>);
    /**
     * Render the path for this endpoint with the given payload.
     * - Path might contain `{placeholder}` values that are replaced with values from `payload`.
     *
     * @returns URL string combining `base` with this endpoint's path, with any `{placeholders}` rendered and `?query` params added.
     *
     * @throws {RequiredError} if this endpoint's path has `{placeholders}` but `payload` is not a data object.
     */
    renderPath(payload: P, caller?: AnyCaller): AbsolutePath;
    /**
     * Match a method/path pair against this endpoint and return any matched `{placeholder}` params.
     */
    match(method: RequestMethod, path: AbsolutePath, caller?: AnyCaller): RequestParams | undefined;
    /**
     * Create an endpoint handler pairing for this endpoint.
     * @param callback The callback function that implements the logic for this endpoint by receiving the payload and returning the response.
     * @returns An `EndpointHandler` object combining this endpoint and the callback into a single typed object.
     */
    handler<C>(callback: EndpointCallback<P, R, C>): EndpointHandler<P, R, C>;
    /** Convert to string, e.g. `GET /user/{id}` */
    toString(): string;
}
/** Any endpoint. */
export type AnyEndpoint = Endpoint<any, any>;
/** List of endpoints. */
export type Endpoints = ImmutableArray<AnyEndpoint>;
/** Extract the payload type from a `Endpoint`. */
export type PayloadType<X extends Endpoint<unknown, unknown>> = X extends Endpoint<infer Y, unknown> ? Y : never;
/** Extract the result type from a `Endpoint`. */
export type EndpointType<X extends Endpoint<unknown, unknown>> = X extends Endpoint<unknown, infer Y> ? Y : never;
/**
 * Represent a HEAD request to a specified path, with validated payload and return types.
 * "The HEAD method requests a representation of the specified resource. Requests using HEAD should only retrieve data and should not contain a request content."
 */
export declare function HEAD<P extends Data, R>(path: AbsolutePath, payload?: Schema<P>, result?: Schema<R>): Endpoint<P, R>;
export declare function HEAD<P extends Data>(path: AbsolutePath, payload: Schema<P>): Endpoint<P, undefined>;
export declare function HEAD<R>(path: AbsolutePath, payload: undefined, result: Schema<R>): Endpoint<undefined, R>;
/**
 * Represent a GET request to a specified path, with validated payload and return types.
 * "The GET method requests a representation of the specified resource. Requests using GET should only retrieve data and should not contain a request content."
 */
export declare function GET<P extends Data, R>(path: AbsolutePath, payload?: Schema<P>, result?: Schema<R>): Endpoint<P, R>;
export declare function GET<P extends Data>(path: AbsolutePath, payload: Schema<P>): Endpoint<P, undefined>;
export declare function GET<R>(path: AbsolutePath, payload: undefined, result: Schema<R>): Endpoint<undefined, R>;
/**
 * Represent a POST request to a specified path, with validated payload and return types.
 * "The POST method submits an entity to the specified resource, often causing a change in state or side effects on the server.
 */
export declare function POST<P, R>(path: AbsolutePath, payload?: Schema<P>, result?: Schema<R>): Endpoint<P, R>;
export declare function POST<P>(path: AbsolutePath, payload: Schema<P>): Endpoint<P, undefined>;
export declare function POST<R>(path: AbsolutePath, payload: undefined, result: Schema<R>): Endpoint<undefined, R>;
/**
 * Represent a PUT request to a specified path, with validated payload and return types.
 * "The PUT method replaces all current representations of the target resource with the request content."
 */
export declare function PUT<P, R>(path: AbsolutePath, payload?: Schema<P>, result?: Schema<R>): Endpoint<P, R>;
export declare function PUT<P>(path: AbsolutePath, payload: Schema<P>): Endpoint<P, undefined>;
export declare function PUT<R>(path: AbsolutePath, payload: undefined, result: Schema<R>): Endpoint<undefined, R>;
/**
 * Represent a PATCH request to a specified path, with validated payload and return types.
 * "The PATCH method applies partial modifications to a resource."
 */
export declare function PATCH<P, R>(path: AbsolutePath, payload?: Schema<P>, result?: Schema<R>): Endpoint<P, R>;
export declare function PATCH<P>(path: AbsolutePath, payload: Schema<P>): Endpoint<P, undefined>;
export declare function PATCH<R>(path: AbsolutePath, payload: undefined, result: Schema<R>): Endpoint<undefined, R>;
/**
 * Represent a DELETE request to a specified path, with validated payload and return types.
 * "The DELETE method deletes the specified resource."
 */
export declare function DELETE<P, R>(path: AbsolutePath, payload?: Schema<P>, result?: Schema<R>): Endpoint<P, R>;
export declare function DELETE<P>(path: AbsolutePath, payload: Schema<P>): Endpoint<P, undefined>;
export declare function DELETE<R>(path: AbsolutePath, payload: undefined, result: Schema<R>): Endpoint<undefined, R>;