export declare const $display: unique symbol;
export declare function escapeHTML(str: string): string;
export interface MediaBundle {
    [mimeType: string]: any;
}
export declare function isVegaLike(obj: any): boolean;
export declare function extractVega(obj: any): MediaBundle | null;
export declare function isDataFrameLike(obj: any): boolean;
export declare function mapPolarsTypeToJSONSchema(colType: any): string;
export declare function extractDataFrame(df: any): MediaBundle;
export declare function isCanvasLike(obj: any): boolean;
export declare function isJpg(obj: unknown): obj is Uint8Array;
export declare function isPng(obj: unknown): obj is Uint8Array;
export declare function isSVGElementLike(obj: any): boolean;
export declare function isHTMLElementLike(obj: any): boolean;
export declare function hasDisplaySymbol(obj: any): boolean;
export declare function makeDisplayable(obj: MediaBundle): any;
/**
 * Format an object for displaying in Deno
 *
 * @param obj - The object to be displayed
 * @returns MediaBundle
 */
export declare function format(obj: any): Promise<MediaBundle>;
/**
 * Show Markdown in Jupyter frontends with a tagged template function.
 */
export declare const md: Function;
/**
 * Show HTML in Jupyter frontends with a tagged template function.
 */
export declare const html: Function;
/**
 * SVG Tagged Template Function.
 */
export declare const svg: Function;
export declare function image(obj: string | Uint8Array): any;
export declare function isMediaBundle(obj: any): obj is MediaBundle;
export declare function formatInner(obj: any, raw: boolean): Promise<MediaBundle>;
export declare class EventEmitter {
    private events;
    on(eventName: string, listener: (...args: any[]) => void): this;
    emit(eventName: string, ...args: any[]): boolean;
    removeListener(eventName: string, listener: (...args: any[]) => void): this;
}
export declare class JupyterNamespace {
    $display: symbol;
    display: any;
    format: typeof format;
    md: Function;
    html: Function;
    svg: Function;
    image: typeof image;
    private _eventEmitter;
    constructor();
    /**
     * Format a result value for display in the TypeScript kernel
     * @param result The value to format
     * @returns A formatted object suitable for Jupyter display
     */
    formatResult(result: any): any;
    private _display;
    broadcast(msgType: string, content: any, options?: {
        metadata?: Record<string, any>;
        buffers?: any[];
    }): Promise<void>;
    onBroadcast(callback: (msgType: string, content: any, metadata: Record<string, any>, buffers: any[]) => void): void;
    offBroadcast(callback: (msgType: string, content: any, metadata: Record<string, any>, buffers: any[]) => void): void;
}
export declare const jupyter: JupyterNamespace;
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