import { AxiosInstance } from 'axios';
import { UploadMetadata, UploadTaskSnapshot } from './types';
import { UploadOptions } from '../types/index';
import { NexaStorageError } from './NexaStorageError';
export declare class UploadTask implements PromiseLike<UploadTaskSnapshot> {
    private file;
    private path;
    options?: UploadOptions;
    private metadata?;
    private client;
    private projectId;
    private state;
    private bytesTransferred;
    private totalBytes;
    private sessionUrl;
    private abortController;
    private listeners;
    private errorListeners;
    private completeListeners;
    private _promise;
    ref: any;
    constructor(projectId: string, client: AxiosInstance, path: string, file: File | Blob, metadata?: UploadMetadata, options?: UploadOptions);
    on(event: 'state_changed', nextOrObserver?: ((snapshot: UploadTaskSnapshot) => void) | {
        next?: (s: UploadTaskSnapshot) => void;
        error?: (e: NexaStorageError) => void;
        complete?: () => void;
    }, error?: (error: NexaStorageError) => void, complete?: () => void): () => void;
    private startPromise;
    then<TResult1 = UploadTaskSnapshot, TResult2 = never>(onfulfilled?: ((value: UploadTaskSnapshot) => TResult1 | PromiseLike<TResult1>) | null, onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | null): Promise<TResult1 | TResult2>;
    catch<TResult = never>(onrejected?: ((reason: any) => TResult | PromiseLike<TResult>) | null): Promise<UploadTaskSnapshot | TResult>;
    private _executeUpload;
    pause(): void;
    resume(): void;
    cancel(): void;
    getSnapshot(): UploadTaskSnapshot;
    private notify;
}