/**
 * See [[ToolbarButtonProvider]]
 */
export interface ToolbarButton {
    /**
     * Raw SVG icon code
     */
    icon?: string;
    title: string;
    /**
     * Optional Touch Bar icon ID
     */
    touchBarNSImage?: string;
    /**
     * Optional Touch Bar button label
     */
    touchBarTitle?: string;
    weight?: number;
    click?: () => void;
    submenu?: () => Promise<ToolbarButton[]>;
    /** @hidden */
    submenuItems?: ToolbarButton[];
}
/**
 * Extend to add buttons to the toolbar
 */
export declare abstract class ToolbarButtonProvider {
    abstract provide(): ToolbarButton[];
}