export declare class FMath {
    private static DECIMALS;
    private static FIXED_1;
    static add(x: string | number | undefined | null, y: string | number | undefined | null): any;
    static sub(x: string | number | undefined | null, y: string | number | undefined | null): any;
    static mul(x: string | number | undefined | null, y: string | number | undefined | null): any;
    static div(x: string | number | undefined | null, y: string | number | undefined | null): string | 0;
    static roundUp(x: string | number | undefined | null, dp: number): any;
    static roundDown(x: string | number | undefined | null, dp: number): any;
    static roundHalfUp(x: string | number | undefined | null, dp: number): string;
    static round(x: string | number | undefined | null, dp: number, rounding?: 'up' | 'down' | 'natural' | null): any;
    static greaterThanOrEqualTo(x: string | number | undefined | null, y: string | number | undefined | null): boolean;
    static greaterThan(x: string | number | undefined | null, y: string | number | undefined | null): boolean;
    static lessThanOrEqualTo(x: string | number | undefined | null, y: string | number | undefined | null): boolean;
    static lessThan(x: string | number | undefined | null, y: string | number | undefined | null): boolean;
    static equalTo(x: string | number | undefined | null, y: string | number | undefined | null): boolean;
    static notEqualTo(x: string | number | undefined | null, y: string | number | undefined | null): boolean;
    private static toFixed;
    private static fromFixed;
    private static makeSureValidNumber;
}