/**
 * data serialized as base64
 */
export type SerialBase64 = string & {
    _base64: undefined;
};
export declare const isSerialBase64: import("type-fns").AssessWithAssure<string, SerialBase64>;
export declare const asSerialBase64: (input: string) => SerialBase64;
export declare const deSerialBase64: (input: SerialBase64) => string;