export type FileCellType = "image" | "video" | "audio" | "file";
export type FileStorageType = "internal" | "external";
export interface AttachmentMetadata {
    [key: string]: string | number | boolean;
}
export interface AttachmentOptions {
    filePath?: string;
    data?: Buffer | Uint8Array;
    filename?: string;
    contentType?: string;
    fileType?: FileCellType;
    metadata?: AttachmentMetadata;
}
export declare class Attachment {
    readonly type: "attachment";
    private _filePath?;
    private _data?;
    private _filename?;
    private _contentType?;
    private _fileType?;
    private _metadata?;
    constructor(options: AttachmentOptions);
    getData(): Promise<Buffer>;
    getFileName(): string;
    getContentType(): string;
    get fileType(): FileCellType;
    get metadata(): AttachmentMetadata | undefined;
}
export interface ExternalAttachmentOptions {
    url: string;
    filename?: string;
    contentType?: string;
    fileType?: FileCellType;
    metadata?: AttachmentMetadata;
}
export declare class ExternalAttachment {
    readonly type: "external";
    private _url;
    private _filename?;
    private _contentType?;
    private _fileType;
    private _metadata?;
    constructor(options: ExternalAttachmentOptions);
    get url(): string;
    get filename(): string | undefined;
    get contentType(): string | undefined;
    get fileType(): FileCellType;
    get metadata(): AttachmentMetadata | undefined;
}
export declare class AttachmentReference {
    readonly storageType: FileStorageType;
    readonly storageKey: string;
    readonly url: string | undefined;
    readonly fileType: FileCellType;
    readonly metadata?: AttachmentMetadata | undefined;
    constructor(storageType: FileStorageType, storageKey: string, url: string | undefined, fileType: FileCellType, metadata?: AttachmentMetadata | undefined);
    download(filePath?: string): Promise<Buffer | void>;
    getUrl(): string | undefined;
    toJSON(): Record<string, unknown>;
}
export declare function isAttachment(value: unknown): value is Attachment;
export declare function isExternalAttachment(value: unknown): value is ExternalAttachment;
export declare function isAttachmentReference(value: unknown): value is AttachmentReference;
export declare function isAnyAttachment(value: unknown): value is Attachment | ExternalAttachment;
export declare const attachment: {
    file: (filePath: string, options?: {
        filename?: string;
        contentType?: string;
        fileType?: FileCellType;
        metadata?: AttachmentMetadata;
    }) => Attachment;
    buffer: (data: Buffer | Uint8Array, filename: string, options?: {
        contentType?: string;
        fileType?: FileCellType;
        metadata?: AttachmentMetadata;
    }) => Attachment;
    url: (url: string, options?: {
        filename?: string;
        contentType?: string;
        fileType?: FileCellType;
        metadata?: AttachmentMetadata;
    }) => ExternalAttachment;
};
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