import type { FontStyle, FontWeight } from './satori';
import type { MayBePromise } from './types';
/** Font cache map */
export declare const FONT_CACHE_MAP: Map<string, ArrayBuffer>;
export type FontDisplay = 'auto' | 'block' | 'swap' | 'fallback' | 'optional';
/** An interface representing options for {@link loadGoogleFont} function */
export interface LoadGoogleFontOptions {
    text?: string;
    /** The font weight to load */
    weight?: string | number;
    /** The font style to load */
    style?: FontStyle;
    /** The `font-display` */
    display?: FontDisplay;
}
/** Default user agent for loading css */
export declare const GOOGLE_FONT_CSS_DEFAULT_USER_AGENT = "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_8; de-at) AppleWebKit/533.21.1 (KHTML, like Gecko) Version/5.0.5 Safari/533.21.1";
/** Google fonts utils */
declare class GoogleFontsUtils {
    /** Default Google font css loader */
    private _defaultCssLoader;
    /** Google font css loader */
    private _cssLoader;
    /**
     * Loads Google font css
     *
     * @param cssUrl The Google font css url
     * @param userAgent The user agent header to be used
     *
     * @returns On success, the css as string
     */
    loadCss(cssUrl: string, userAgent?: string): Promise<string>;
    /**
     * Sets Google font css loader
     *
     * @param loader The {@link GoogleFontCssLoader}
     */
    setCssLoader(loader: (cssUrl: string, userAgent: string) => MayBePromise<string | undefined>): void;
}
export declare const googleFonts: GoogleFontsUtils;
/** Constructs Google font css url */
export declare const constructGoogleFontCssUrl: (family: string, { text, weight, style, display }?: {
    text?: string;
    weight?: string | number;
    style?: FontStyle;
    display?: FontDisplay;
}) => string;
/**
 * A helper function for loading google fonts as {@link ArrayBuffer}
 *
 * @param family The name of the font family
 * @param param1 Options
 *
 * @returns A promise which resolved to {@link ArrayBuffer}
 */
export declare const loadGoogleFont: (family: string, { text, weight, style, display }?: LoadGoogleFontOptions) => Promise<ArrayBuffer>;
/** Base font options */
export interface BaseFontOptions {
    weight?: FontWeight;
    style?: FontStyle;
}
/** Base font class */
export declare class BaseFont {
    protected input: MayBePromise<ArrayBuffer> | (() => MayBePromise<ArrayBuffer>) | undefined;
    name: string;
    style: FontStyle;
    weight: FontWeight;
    constructor(name: string, input: MayBePromise<ArrayBuffer> | (() => MayBePromise<ArrayBuffer>) | undefined, { weight, style }?: BaseFontOptions);
    get data(): MayBePromise<ArrayBuffer> | (() => MayBePromise<ArrayBuffer>) | undefined;
}
/** An interface representing options for {@link CustomFont} */
export interface CustomFontOptions extends BaseFontOptions {
    lang?: string;
}
/** A helper class to load Custom font */
export declare class CustomFont extends BaseFont {
    protected input: MayBePromise<ArrayBuffer> | (() => MayBePromise<ArrayBuffer>);
    private promise?;
    lang: string | undefined;
    /**
     * Creates an instance of {@link CustomFont}
     *
     * @param name The name of the font (can be used for font-family css property)
     * @param input Font data as `ArrayBuffer` or a promise which resolves to `ArrayBuffer`
     * @param options
     */
    constructor(name: string, input: MayBePromise<ArrayBuffer> | (() => MayBePromise<ArrayBuffer>), options?: CustomFontOptions);
    /**
     * A promise which resolves to font data as `ArrayBuffer`
     */
    get data(): Promise<ArrayBuffer>;
}
/** An interface representing options for {@link GoogleFont} */
export interface GoogleFontOptions extends BaseFontOptions {
    /** The name of the font (can be used for font-family css property) */
    name?: string;
    /** Loads font only for particular text (for better performance) */
    text?: string;
}
/** A helper class to load Google font */
export declare class GoogleFont extends BaseFont {
    protected input: Promise<ArrayBuffer> | undefined;
    private promise?;
    /** The font family name */
    family: string;
    /** Text for which the font is loaded */
    text: string | undefined;
    /**
     * Creates an instance of {@link GoogleFont}
     *
     * @param family The name of font family to load
     * @param options The {@link GoogleFontOptions}
     */
    constructor(family: string, options?: GoogleFontOptions);
    /** A promise which resolves to font data as `ArrayBuffer` */
    get data(): Promise<ArrayBuffer>;
    /**
     * Checks whether font can load buffer
     *
     * @returns On success, true otherwise the error object thrown
     */
    canLoad(): Promise<unknown>;
}
export interface FontBuffer {
    data: MayBePromise<ArrayBuffer>;
}
export type FontInput = MayBePromise<Response | ArrayBuffer> | FontBuffer;
/** Default font utils */
declare class DefaultFont {
    private _fallbackFont?;
    private _fontData?;
    private _fontShouldResolve;
    /**
     * Sets default font for image rendering
     *
     * @param input {@link FontInput}
     */
    set(input: FontInput | (() => FontInput)): void;
    /**
     * Gets default font buffer for image rendering if it is set
     *
     * @returns A Promise which resolves to ArrayBuffer if default font is set,
     * otherwise undefined
     */
    get(): Promise<ArrayBuffer | undefined>;
    /**
     * Check whether default font is set or not
     *
     * @returns true if default font is set, otherwise false
     */
    has(): boolean;
}
export declare const defaultFont: DefaultFont;
export {};