import { IRenderer, LayerHook, RenderFrameState } from '../../interfaces/i-renderer';
import { BubbleState } from '../../models/internal/bubble-state';
import { Configuration, RenderLayer } from '../../models/public/configuration';
export declare class SvgRenderer implements IRenderer {
    private readonly config;
    private svgEl;
    private defsEl;
    private container;
    private width;
    private height;
    private readonly layerGroups;
    private readonly hooksByLayer;
    constructor(config: Configuration);
    mount(container: HTMLElement): void;
    renderFrame(bubbles: ReadonlyArray<BubbleState>, state: RenderFrameState): void;
    renderLayer(layer: RenderLayer, bubbles: ReadonlyArray<BubbleState>, state: RenderFrameState): void;
    addLayerHook(hook: Omit<LayerHook, 'id'>): string;
    removeLayerHook(id: string): void;
    getLayerHooks(layer?: RenderLayer): ReadonlyArray<LayerHook>;
    resize(width: number, height: number): void;
    dispose(): void;
    /**
     * Registers an internal built-in hook using the reserved "builtin:" prefix.
     * This method is intentionally separate from the public addLayerHook() to
     * enforce the prefix restriction at the type boundary.
     */
    private registerBuiltinHook;
    /**
     * Inserts a hook in priority-ascending order, preserving insertion order for
     * ties (stable sort behaviour via scan from the tail).
     */
    private insertHook;
    /**
     * Ensures one radial gradient definition per unique bubble color exists in
     * <defs> when the theme is "glass". Clears all defs for the "flat" theme.
     */
    private syncGradientDefs;
    private drawBackground;
    private drawShadows;
    private drawBubbles;
    private drawText;
    private drawDebug;
    private lightenColor;
    private darkenColor;
    /**
     * Shifts each RGB channel of a hex color by amount * 255.
     * Positive amount lightens; negative darkens. Clamps to [0, 255].
     * Handles both 3-digit and 6-digit hex strings, with or without '#'.
     */
    private shiftColor;
}