/// <reference types="node" />
/**
 * The possible accents.
 */
export declare enum ACCENT_STATE {
    /**
     * Default accent. No transparency, background is black.
     */
    ACCENT_DISABLED = 0,
    /**
     * Background is determined by color. (alpha channel ignored)
     */
    ACCENT_ENABLE_GRADIENT = 1,
    /**
     * Background is determined by color.
     */
    ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
    /**
     * Background is determined by color, with a blur for transparent areas.
     */
    ACCENT_ENABLE_BLURBEHIND = 3,
    /**
     * Background is determined by color, with an acrylic blur for transparent areas.
     * Note that the module will replace an alpha of 0 with an alpha of 1 (out of 255)
     * because Windows has bugs with a fully transparent alpha.
     */
    ACCENT_ENABLE_ACRYLICBLURBEHIND = 4,
    /**
     * Behavior unknown, left for completeness's sake.
     */
    ACCENT_ENABLE_HOSTBACKDROP = 5,
    /**
     * Fully transparent background.
     * Note that this tends to be buggy and to change value across Windows versions
     * (for example it was initially the value of {@link ACCENT_STATE#ACCENT_ENABLE_ACRYLICBLURBEHIND})
     * so it is more reliable to use {@link ACCENT_STATE#ACCENT_ENABLE_TRANSPARENTGRADIENT} with an alpha of 0.
     * (you also get the benefit of less bugs)
     */
    ACCENT_INVALID_STATE = 6
}
/**
 * Sets a window's composition attribute
 * @param window The target window's native handle.
 * @param accent The desired accent.
 * @param color The background color in 0xRRGGBBAA.
 */
export declare function SetWindowCompositionAttribute(window: Buffer, accent: ACCENT_STATE, color: number): any;