export type GetVolume = () => Promise<number>;
export type SetVolume = (targetValue: number) => Promise<void>;
export type GetMute = () => Promise<boolean>;
export type SetMute = (isMuted: boolean) => Promise<void>;
export type ToggleMute = () => Promise<boolean>;
export interface VolumeControl extends PlatformImplementation {
    /**
     * Toggle mute state
     * @returns Current (new) mute state (true == muted, false == unmuted)
     */
    toggleMute: ToggleMute;
}
export interface PlatformImplementation {
    /**
     * Get current system volume
     * @returns System volume, from 0 to 100
     */
    getVolume: GetVolume;
    /**
     * Change system volume to target value
     * @param targetValue Target volume, from 0 to 100
     */
    setVolume: SetVolume;
    /**
     * Get current mute status (whether the system audio is muted or not)
     * @returns Whether the system audio is muted, i.e. true == muted, false == unmuted
     */
    getMute: GetMute;
    /**
     * Either mute or unmute system audio
     * @param isMuted Whether to mute or unmute the system audio
     */
    setMute: SetMute;
}
export declare class SetVolumeError extends Error {
}
export declare class GetVolumeError extends Error {
}