export declare type FileSizeMetric = 'bytes' | 'kilobytes' | 'megabytes' | 'gigabytes' | 'terabytes' | 'petabytes';
export declare class FileSizeBuilder implements PromiseLike<number> {
    /**
     * Stores the file size metric.
     */
    private metric;
    /**
     * Stores the file path.
     */
    private readonly filePath;
    /**
     * Create a new instance for the given `filePath`.
     */
    constructor(filePath: string);
    inBytes(): Promise<number>;
    inKb(): Promise<number>;
    inMb(): Promise<number>;
    inGb(): Promise<number>;
    inTb(): Promise<number>;
    inPb(): Promise<number>;
    private setMetric;
    /**
     * Returns the file size with the provided metric ("bytes" by default).
     */
    then<TResult1 = number, TResult2 = never>(onfulfilled: ((value: number) => TResult1 | PromiseLike<TResult1>), onrejected: ((reason: any) => TResult2 | PromiseLike<TResult2>)): PromiseLike<TResult1 | TResult2>;
    private calculate;
    private convert;
    private toKilobytes;
    private toMegabytes;
    private toGigabytes;
    private toTerabytes;
    private toPetabytes;
}