export declare class ValidationHelper {
    static validateNumber: (input: any, from?: number | undefined, to?: number | undefined) => boolean;
    static validateYear: (input: any) => boolean | string | Promise<boolean | string>;
    static validateMonth: (input: any) => boolean | string | Promise<boolean | string>;
    static validateDay: (input: any) => boolean | string | Promise<boolean | string>;
    static validateHour: (input: any) => boolean | string | Promise<boolean | string>;
    static validateMinute: (input: any) => boolean | string | Promise<boolean | string>;
    static validateAmount: (input: any) => boolean | string | Promise<boolean | string>;
    static validateGitUrl: (input: any) => boolean | string | Promise<boolean | string>;
    static validateUsername: (input: any) => boolean | string | Promise<boolean | string>;
    static validatePassword: (input: any) => boolean | string | Promise<boolean | string>;
    static validateClientSecret: (input: any) => boolean | string | Promise<boolean | string>;
    static validateJiraEndpoint: (input: any) => boolean | string | Promise<boolean | string>;
    static validateJiraKey: (input: any) => boolean | string | Promise<boolean | string>;
    static validateJiraIssueKey: (input: any) => boolean | string | Promise<boolean | string>;
    static validateFile: (input: any) => boolean;
}