export declare function errorFeedback(funcName: string): number;
export declare function isNull(param: any): boolean;
export declare function checkType(value: any, name: string, type: string, maybe_null: boolean): void;
export declare function checkStringType(value: any, name: string, maybe_null?: boolean): void;
export declare function checkNumberType(value: any, name: string, maybe_null?: boolean): void;
export declare function checkBooleanType(value: any, name: string, maybe_null?: boolean): void;
export declare function checkIsNull(value: any, name: string): void;
export declare function checkNumerString(value: any, name: string, maybe_null?: boolean): void;
export declare const getMacVersion: () => string;