/**
 * Extended files API 3P storage providers, features like sending Blob from Teams to 3P app on user
 * actions like drag and drop to compose
 * @beta
 * @module
 */
import { SdkError } from './interfaces';
/**
 * Interface to assemble file chunks
 * @beta
 */
export interface AssembleAttachment {
    /** A number representing the sequence of the attachment in the file chunks. */
    sequence: number;
    /** A Blob object representing the data of the file chunks. */
    file: Blob;
}
/**
 * Object used to represent a file
 * @beta
 *
 */
export interface FilesFor3PStorage extends Blob {
    /**
     * A number that represents the number of milliseconds since the Unix epoch
     */
    lastModified: number;
    /**
     * Name of the file
     */
    name: string;
    /**
     * file type
     */
    type: string;
    /**
     * A string containing the path of the file relative to the ancestor directory the user selected
     */
    webkitRelativePath?: string;
}
/**
 * File chunks an output of getDragAndDropFiles API from platform
 * @beta
 */
export interface FileChunk {
    /**
     * Base 64 data for the requested uri
     */
    chunk: string;
    /**
     * chunk sequence number
     */
    chunkSequence: number;
    /**
     * Indicates whether this chunk is the final segment of a file
     */
    endOfFile: boolean;
}
/**
 * Output of getDragAndDropFiles API from platform
 * @beta
 */
export interface FileResult {
    /**
     * Error encountered in getDragAndDropFiles API
     */
    error?: SdkError;
    /**
     * File chunk which will be assemebled and converted into a blob
     */
    fileChunk: FileChunk;
    /**
     * File index of the file for which chunk data is getting recieved
     */
    fileIndex: number;
    /**
     * File type/MIME type which is getting recieved
     */
    fileType: string;
    /**
     * Indicates whether this file is the last one in a sequence.
     */
    isLastFile: boolean;
    /**
     * The name of the file.
     */
    fileName: string;
}
/**
 * Defines the callback function received from Third Party App
 * @beta
 */
export interface DragAndDropFileCallback {
    /**
     * Definition of the callback which is received from third party app when calling {@link thirdPartyCloudStorage.getDragAndDropFiles}
     * An array of drag and dropped files {@link thirdPartyCloudStorage.FilesFor3PStorage}
     * Error encountered during the API call {@link SdkError}
     */
    (files: FilesFor3PStorage[], error?: SdkError): void;
}
/**
 * Get drag-and-drop files using a callback.
 *
 * @param {string} dragAndDropInput - unique id which is a combination of replyToId + threadId of teams chat and channel.
 *   Both replyToId and threadId can be fetched from application context.
 * @param {DragAndDropFileCallback} dragAndDropFileCallback - callback
 *   A callback function to handle the result of the operation
 * @beta
 */
export declare function getDragAndDropFiles(dragAndDropInput: string, dragAndDropFileCallback: DragAndDropFileCallback): void;
/**
 * Checks if the thirdPartyCloudStorage capability is supported by the host
 * @returns boolean to represent whether the thirdPartyCloudStorage capability is supported
 *
 * @throws Error if {@linkcode app.initialize} has not successfully completed
 * @beta
 */
export declare function isSupported(): boolean;