export declare const SMS_MAX = 90;
export declare const LMS_MAX = 2000;
export declare const MMS_FILE_MAX = 300;
export declare const trimText: (input: string) => string;
export declare const prettyPhoneNum: (input: string) => string;
/** @returns content-length(euc-kr) */
export declare const getContentLength: (input: string) => number;
export declare const getRequestDuration: (input?: number) => {
    startTime: string;
    endTime: string;
};