import { Widget } from '@lumino/widgets';
/**
 * Colour definitions - CSS classes are defined in style/base.css
 * CSS variables handle light/dark theme switching automatically
 */
export declare const COLOURS: {
    name: string;
    id: string;
    cssClass: string;
}[];
/**
 * Set (or clear) a widget's dock-tab colour via its Lumino title className.
 * `colourId` is one of the colour ids or null to clear. Applied through the
 * widget's Lumino title so it rides tab re-renders; independent of the
 * menu-driven, localStorage-backed per-tab colours. Backs the public
 * IColourfulTabs API.
 */
export declare function setWidgetTabColour(widget: Widget, colourId: string | null): void;