/**
 * Gets a handler for a specific message type, prefers a public (w\o _ prefix) method, if available
 */
export declare function getOptionalHandler(instance: {
    [key: string]: any;
}, messageType: string): ((...args: any) => unknown) | null;
export declare function getHandler(instance: {
    [key: string]: any;
}, messageType: string): (...args: any) => unknown;