export type FileUploadRejectionCode = 'file-invalid-type' | 'file-too-small' | 'file-too-large' | 'too-many-files' | 'custom';
export type FileUploadRejected = {
    file: File;
    code: FileUploadRejectionCode;
    reason: string;
};
export type FileValidationError = Omit<FileUploadRejected, 'file'>;
export type FileValidationRule = {
    accept?: string;
    maxSize?: number;
    minSize?: number;
    maxFiles?: number;
    multiple?: boolean;
    validate?: (file: File) => string | null;
};
export type AcceptSpec = {
    mimeTypes: ReadonlyArray<string>;
    extensions: ReadonlyArray<string>;
};
export declare function parseAccept(accept: string | undefined): AcceptSpec;
export declare function matchesAccept(file: File, accept: string): boolean;
export declare function getFileValidationError(file: File, rule: FileValidationRule, currentFiles: ReadonlyArray<File>): FileValidationError | null;
export declare function validateFile(file: File, rule: FileValidationRule, currentFiles: ReadonlyArray<File>): string | null;
export declare function formatFileSize(bytes: number): string;
export declare function formatFileType(file: File): string;
export declare function formatAcceptedTypes(accept: string | undefined): string;
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