/** Event methods (`on`, `off`, `once`, `emit`) that `mixin` adds to an object. */
export interface EmitterMixin {
    on: (event: string, callback: (...args: unknown[]) => void, context?: unknown) => void;
    off: (event: string, callback?: (...args: unknown[]) => void) => void;
    once: (event: string, callback: (...args: unknown[]) => void, context?: unknown) => void;
    emit: (event: string, ...args: unknown[]) => void;
}
/**
 * Extend given object with emitter functions `on`, `off`, `once`, `emit`
 * @param obj - Object to extend with emitter functions
 * @return The object with emitter methods
 */
export declare function mixin<T extends object>(obj: T): T & EmitterMixin;
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