export default class Calculator {
    protected current: number;
    constructor(initial?: number);
    value(): number;
    clear(): this;
    add(n: number): this;
    sub(n: number): this;
    mul(n: number): this;
    div(n: number): this;
    mod(n: number): this;
    exp(): this;
    ln(): this;
    sin(): this;
    cos(): this;
    tan(): this;
    inverse(): this;
}