export interface IProgressTime {
    /**
     * Start time.
     */
    start: number;
    /**
     * Current time.
     */
    now: number;
    /**
     * Current duration.
     */
    duration: number;
    /**
     * Delta since last update.
     */
    delta: number;
}
export interface IProgressTotal {
    /**
     * Total amount.
     */
    total: number;
    /**
     * Current amount.
     */
    current: number;
    /**
     * Remaining amount.
     */
    remaining: number;
    /**
     * Delta since last update.
     */
    delta: number;
}
export declare type ProgressCallback = (time: IProgressTime, total: IProgressTotal) => void;
/**
 * Progress wrapper.
 *
 * @param total Total progress.
 * @param current Starting progress.
 */
export declare class Progress extends Object {
    /**
     * Total amount.
     */
    protected readonly _total: number;
    /**
     * Current amount.
     */
    protected _current: number;
    /**
     * Update interval.
     */
    protected _interval: any;
    /**
     * Update callback.
     */
    protected _callback: ProgressCallback | null;
    /**
     * Start time.
     */
    protected _start: number;
    /**
     * Previous update time.
     */
    protected _prevTime: number;
    /**
     * Previous update total.
     */
    protected _prevCurrent: number;
    constructor(total: number, current?: number);
    /**
     * Get the current time.
     *
     * @returns Current time in milliseconds.
     */
    now(): number;
    /**
     * Set to current amount.
     *
     * @param amount Amount to be set.
     */
    set(amount: number): void;
    /**
     * Add to current amount.
     *
     * @param amount Amount to be added.
     */
    add(amount: number): void;
    /**
     * Start updater.
     *
     * @param interval Update interval in miliseconds.
     * @param cb Progress callback.
     */
    start(interval: number, cb: ProgressCallback): void;
    /**
     * End updater.
     */
    end(): void;
    /**
     * Update callback.
     */
    update(): void;
}