/**
 * @typedef {Object} BonaEventOptions
 * @property {boolean} [once] Trigger callback once.
 */
export default class Base {
    _events: {};
    /**
     * Attach an event handler function.
     *
     * @param {string} event Event name.
     * @param {function} callback Callback.
     * @param {BonaEventOptions} [options] Options.
     */
    on(event: string, callback: Function, options?: BonaEventOptions): void;
    /**
     * Remove an event handler.
     *
     * @param {string} event Event name.
     * @param {function} [callback] Callback.
     */
    off(event: string, callback?: Function): void;
    /**
     * Execute all handlers for the given event type.
     *
     * @param {string} event Event name.
     * @param params Extra parameters.
     */
    trigger(event: string, ...params: any[]): void;
}
export type BonaEventOptions = {
    /**
     * Trigger callback once.
     */
    once?: boolean;
};
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