export declare class Formula {
    formula: string;
    current_number: number;
    prev_number: number;
    stack: string[];
    start: boolean;
    dotted: boolean;
    is_operand: boolean;
    radians: boolean;
    operation: string;
    memory: number;
    in_memory: boolean;
    bracket: boolean;
    secondScreen: boolean;
    constructor(formula?: string);
    get(): string;
    parse(value: string): number;
    getCurrentNumber(): number;
    setRadians(switcher: boolean): boolean;
    clear(): string;
    clearMemory(): void;
    sumToMemory(): void;
    deductToMemory(): void;
    readMemory(): string;
    addBracket(value: string): void;
    setOperation(operand: string): void;
    calculate(): number;
    addValue(value: string, start: boolean): string;
    removeSymbol(): void;
    singleton(operand: string, data: any): number;
    show(value: number): string;
}