import { DropZoneError, DropZoneFileType, DropZoneProps, FileType, DropZoneFiles } from './types';
/**
 * Helper compares files by size and date/time when it was last modified
 * @param {DropZoneFileType} firstFile - First file
 * @param {DropZoneFileType} secondFile - Second file
 *
 * @returns {boolean} Are files equal?
 */
export declare const compareFiles: (firstFile: DropZoneFileType, secondFile: DropZoneFileType) => boolean;
/**
 * Helper checks if selected file was already added
 * @param {DropZoneProps} props - Properties of DropZone component
 * @param {DropZoneState} state - State of DropZone component
 * @param {FileType} file - Selected file
 *
 * @returns {boolean} Has selected file been added?
 */
export declare const checkForAddedFile: (props: DropZoneProps, state: DropZoneFiles, file: FileType) => boolean;
/**
 * Helper checks if newly added file suits all parameters and returns error code
 * @param {DropZoneProps} props - Properties of DropZone component
 * @param {DropZoneState} state - State of DropZone component
 * @param {FileType} file - Newly added file
 * @param {number} lastDropped - Number of last dropped files
 *
 * @returns {number} Error code
 */
export declare const getErrorCode: (props: DropZoneProps, state: DropZoneFiles, file: FileType, lastDropped: number) => number;
/**
 * Helper adds error code to rejected file information
 * @param {number} errorCode - Error code
 * @param {FileType} file - Rejected file
 *
 * @returns {FileType} Rejected file with error code
 */
export declare const addErrorCodeToFile: (errorCode: number, file: FileType) => FileType;
/**
 * Helper checks new file for errors and adds it to acceptedFiles or rejectedFiles
 * @param {DropZoneProps} props - Properties of DropZone component
 * @param {DropZoneState} state - State of DropZone component
 * @param {FileType[]} accepted - Accepted files
 * @param {FileType[]} rejected - Rejected files
 *
 * @returns {[FileType[], FileType[]]} AcceptedFiles and rejectedFiles array
 */
export declare const checkFiles: (props: DropZoneProps, state: DropZoneFiles, accepted: FileType[], rejected: FileType[]) => [FileType[], FileType[]];
/**
 * Helper returns DropZone error
 * @param {DropZoneFileType | ExternalFile} file - Rejected file
 *
 * @returns {DropZoneError} Error message and code
 */
export declare const getError: (file: FileType) => DropZoneError;
/**
 * Helper returns error description
 * @param {DropZoneFileType | ExternalFile} file - Rejected file
 *
 * @returns {string} Error description
 */
export declare const getErrorDescription: (file: FileType) => string;
/**
 * Helper gets actual value of component's state
 * @param {DropZoneFiles | undefined | null} propValue - Value passed through props in controlled mode
 * @param {DropZoneState} stateValue - Value stored in component's state
 *
 * @returns {DropZoneFiles} Value of component's state
 */
export declare const getValue: (propValue: DropZoneFiles | null | undefined, stateValue: DropZoneFiles) => DropZoneFiles;
/**
 * Helper removes file from file list
 * @param {FileType} removedFile - File removed from file list
 * @param {FileType[]} rejectedFiles - Files that were rejected
 * @param {FileType[]} acceptedFilesFromState - Accepted files stored in state in uncontrolled mode or passed through props in controlled mode
 *
 * @returns {{ newDropped: DropZoneFiles, newValue: DropZoneFiles }} File lists
 */
export declare const removeFromFileList: (removedFile: FileType, rejectedFiles: FileType[], acceptedFilesFromState: FileType[]) => {
    newDropped: DropZoneFiles;
    newValue: DropZoneFiles;
};
/**
 * Helper adds file to file list
 * @param {FileType[]} acceptedFiles - Files accepted after check
 * @param {FileType[]} rejectedFiles - Files rejected after check
 * @param {FileType[]} acceptedFilesFromState - Accepted files stored in state in uncontrolled mode or passed through props in controlled mode
 *
 * @returns {{ newDropped: DropZoneFiles, newValue: DropZoneFiles }} File lists
 */
export declare const addToFileList: (acceptedFiles: FileType[], rejectedFiles: FileType[], acceptedFilesFromState: FileType[]) => {
    newDropped: DropZoneFiles;
    newValue: DropZoneFiles;
};