type State = "NOT_STARTED" | "UPLOADING" | "BACKOFF" | "SUCCESSFUL" | "FAILED" | "CANCELLED";
export declare class GCSResumableUpload {
    private sessionURI;
    private localFile;
    private crc32cb64;
    private onProgressHandlers;
    private currentProgress;
    private currentState;
    private onStateChangeHandlers;
    private xhr;
    constructor(sessionURI: string, localFile: File);
    calculateChecksum(): Promise<void>;
    cancel(): void;
    start(): Promise<void>;
    private handleChunk;
    private finalDataStored;
    private getUploadStatus;
    private backOff;
    private logUploadProgress;
    onProgress(handler: (percent: number) => void): void;
    private fireProgress;
    onStateChange(handler: (newState: State) => void): void;
    private fireNewState;
}
export {};