@aws-amplify/storage/dist/esm/types/common.d.ts

export type TransferTaskState = 'IN_PROGRESS' | 'PAUSED' | 'CANCELED' | 'SUCCESS' | 'ERROR';
export type TransferProgressEvent = {
    transferredBytes: number;
    totalBytes?: number;
};
export type TransferTask<Result> = {
    /**
     * Cancel an ongoing transfer(upload/download) task. This will reject the `result` promise with an `AbortError` by
     * default. You can use `isCancelError` to check if the error is caused by cancellation.
     *
     * @param message - Optional error message to overwrite the default `canceled` message thrown when the task is
     * 	canceled. If provided, the `result` promise will be rejected with a {@link CanceledError} with supplied error
     *  message instead.
     */
    cancel: (message?: string) => void;
    /**
     * Pause an ongoing transfer(upload/download) task. This method does not support the following scenarios:
     * * Downloading data or file from given key.
     */
    pause: () => void;
    /**
     * Resume a paused transfer(upload/download) task. This method does not support the following scenarios:
     * * Downloading data or file from given key.
     */
    resume: () => void;
    /**
     * Current state of the transfer task.
     */
    readonly state: TransferTaskState;
    /**
     * Promise that resolves when the transfer task is completed. The promise will be rejected if the task is canceled.
     */
    result: Promise<Result>;
};
export type DownloadTask<Result> = Omit<TransferTask<Result>, 'pause' | 'resume'>;
export type UploadTask<Result> = TransferTask<Result>;