import { ActionResult, Facility, Invocation, Middleware, PlumierApplication } from "@plumjs/core";
import { Context } from "koa";
export interface ServeStaticOptions {
    /**
     * Root directory of static assets
     **/
    root: string;
    /**
     * Browser cache max-age in milliseconds. (defaults to 0)
     **/
    maxAge?: number;
    /**
     * Tell the browser the resource is immutable and can be cached indefinitely. (defaults to false)
     **/
    immutable?: boolean;
    /**
     * Try to serve the gzipped version of a file automatically when gzip is supported by a client and if the requested file with .gz extension exists. (defaults to true).
     **/
    gzip?: boolean;
    /**
     * Try to serve the brotli version of a file automatically when brotli is supported by a client and if the requested file with .br extension exists. (defaults to true).
     **/
    brotli?: boolean;
}
export declare class FileActionResult extends ActionResult {
    private opt?;
    constructor(path: string, opt?: ServeStaticOptions | undefined);
    execute(ctx: Context): Promise<void>;
}
export declare class ServeStaticMiddleware implements Middleware {
    option: ServeStaticOptions;
    constructor(option: ServeStaticOptions);
    execute(invocation: Readonly<Invocation>): Promise<ActionResult>;
}
export declare class ServeStaticFacility implements Facility {
    option: ServeStaticOptions;
    constructor(option: ServeStaticOptions);
    setup(app: Readonly<PlumierApplication>): Promise<void>;
}