export declare class StringBuilder {
    value: Array<any>;
    count: number;
    constructor(capacity?: number);
    append(v: any): StringBuilder;
    length(): number;
    capacity(): number;
    toString(): string;
    _ensureCapacityInternal(minimumCapacity: number): void;
    _expandCapacity(minimumCapacity: number): void;
    _appendNull(): this;
}
export default StringBuilder;