/// <reference types="node" />
import { Request, Response } from 'express';
import { ServerResponse } from 'http';
import { Color, ExtendOptions, Region, Sharp } from 'sharp';
import { Duplex } from 'stream';
import { Logger } from 'pino';
export declare type Middleware = (req: Request, res: IMutableResponse, next: () => any) => any;
/**
 * Receives an [express Request](https://expressjs.com/en/api.html#req) and
 * returns `true` if hastily should attempt to optimize the current request.
 * The default implementation tests the file extension for files supported as
 * input formats by `sharp`.
 */
export declare type RequestFilter = (request: Request) => boolean;
export interface IRequestErrors {
    url: string;
    warnings: Warning[];
}
/**
 * Receives a {@link RequestErrors} object to do side effects such as logging.
 * Default prints to stderr.
 */
export declare type ErrorLogger = (errors: IRequestErrors | Error) => any;
export declare type Param = 'bg-color' | 'blur' | 'brightness' | 'canvas' | 'crop' | 'contrast' | 'disable' | 'dpr' | 'enable' | 'fit' | 'height' | 'orient' | 'pad' | 'resize-filter' | 'saturation' | 'sharpen' | 'trim' | 'width';
export declare type ParamMap = Map<Param, string>;
export declare type NumericParams = (number | undefined)[];
export declare type Mapper = (transform: Sharp, params: IFastlyParams) => Sharp | false;
export declare type Orientation = 'r' | 'l' | 'h' | 'v' | 'hv' | 'vh' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8';
export declare type Format = 'gif' | 'png' | 'png8' | 'jpg' | 'pjpg' | 'webp' | 'webpll' | 'webply';
export interface IMutableResponse extends ServerResponse, Response {
    _header: any;
    flush(): any;
    _implicitHeader(): any;
}
export declare type Handler = (...args: readonly any[]) => any;
export declare type EventName = string | symbol;
export declare type Listener = readonly [EventName, Handler];
export interface IWorkStream extends Duplex {
    flush(): any;
}
export declare type WarnType = 'unsupported' | 'invalid';
export interface Warning {
    type: WarnType;
    msg: string;
}
export interface IFastlyParams {
    /**
     * The Express.Request being handled.
     */
    req: Request;
    /**
     * The Express.Response being transformed.
     */
    res: IMutableResponse;
    /**
     * Logger object for the context of this request.
     */
    log: Logger;
    /**
     * The requested output quality, from 1-100 (optional, default 85 from sharp)
     */
    quality: number | undefined;
    /**
     * Get a string value from the raw query.
     */
    get(param: Param): string | undefined;
    /**
     * Test for the presence of a string value in the raw query.
     */
    has(param: Param): boolean;
    /**
     * Record that an unsupported or invalid value was passed, for optional later
     * logging.
     */
    warn(type: WarnType, param: Param, msg?: string): void;
    /**
     * Get list of warnings for optional logging.
     */
    getWarnings(): Warning[];
    /**
     * Cast parameters to numbers, and return them in order.
     * @example
     *     params.toNumbers(['width', 'dpr'])
     *     // from query width=400&dpr=1.300,
     *     // returns [400, 1.3]
     */
    toNumbers(names: Param[]): NumericParams;
    /**
     * Parse a comma-separated string specifying top, left, bottom, and right
     * pixel values, and optionally background color.
     * @example
     *     params.toCssBox('extend')
     *     // from query extend=25,30,80&bg-color=40,40,40
     *     // returns {
     *     //   top: 25,
     *     //   left: 30,
     *     //   bottom: 80,
     *     //   right: 30,
     *     //   background: { r: 40, g: 40, b: 40 }
     *     // }
     *
     */
    toCssBox(name: Param): ExtendOptions;
    /**
     * Parse a comma-separated string R,G,B into a color value usable by Sharp.
     * @example
     *     params.toColor('bg-color')
     *     // from query bg-color=ccc
     *     // returns '#ccc'
     *     // from query bg-color=3,50,40
     *     // returns { r: 3, g: 50, b: 40 }
     */
    toColor(name: Param): Color;
    /**
     * Parse a comma-separated string with optional tag-prefixed values and
     * required positional values.
     * @example
     *     params.toTaggedValues('canvas', ['width', 'foo'], ['smart', 'x'])
     *     // from query canvas=30,bar,smart,x5
     *     // returns { width: 30, foo: 'bar', smart: null, x: 5 }
     */
    toTaggedValues(name: Param, positional: string[], named: string[]): {
        [key: string]: string | null;
    };
    /**
     * Parse a comma-separated string into an absolutely positioned CSS box,
     * with optional top, left, width, and height values.
     * @example
     *     params.toRegion('extract')
     *     // from query extract=40,80,y0,x50
     *     // returns { width: 40, height: 80, left: 50, top: 0 }
     */
    toRegion(name: Param): Partial<Region>;
}