/**
 * Constants for the glow effect.
 *
 * @module constants
 * @internal
 */
/**
 * Default options - tuned for YouTube web player style glow.
 *
 * @internal
 */
export declare const DEFAULT_OPTIONS: {
    readonly blur: 96;
    readonly opacity: 0.65;
    readonly brightness: 1.1;
    readonly saturate: 1.2;
    readonly scale: 1.08;
    readonly downscale: 0.08;
    readonly updateInterval: 98;
    readonly blendOld: 0.85;
    readonly blendNew: 0.15;
};
/**
 * Video readyState value for checking if we can extract frames.
 *
 * @internal
 */
export declare const VIDEO_READY_STATE_CURRENT_DATA = 2;
/**
 * Resize debounce delay in ms (stops excessive resizing).
 *
 * @internal
 */
export declare const RESIZE_DEBOUNCE_MS = 100;
/**
 * Canvas CSS styles.
 *
 * @internal
 */
export declare const CANVAS_STYLE: {
    readonly BORDER_RADIUS: "12px";
    readonly Z_INDEX: "-1";
    readonly POSITION: "absolute";
    readonly POINTER_EVENTS: "none";
};
/**
 * CSS transform to center canvas.
 *
 * @internal
 */
export declare const CANVAS_TRANSFORM = "translate(-50%, -50%)";
/**
 * Canvas context options.
 *
 * @internal
 */
export declare const CANVAS_CONTEXT_OPTIONS: {
    readonly willReadFrequently: true;
    readonly alpha: false;
};
/**
 * Min canvas size.
 *
 * @internal
 */
export declare const MIN_CANVAS_DIMENSION = 1;
/**
 * Min video size.
 *
 * @internal
 */
export declare const MIN_VIDEO_DIMENSION = 0;