export type AttachmentTransferStage = "referenced" | "fetching" | "available" | "missing" | "expired";
export interface AttachmentDescriptor {
    profile: "mesh.attachment.v1";
    roomId: string;
    ownerId: string;
    attachmentId: string;
    objectPath: string;
    mimeType: string;
    byteLength: number;
    retentionUntilMs?: number;
}
export declare function attachmentObjectPath(roomId: string, ownerId: string, attachmentId: string): string;
export declare function createAttachmentDescriptor(roomId: string, ownerId: string, attachmentId: string, mimeType: string, byteLength: number, retentionUntilMs?: number): AttachmentDescriptor;
export declare function attachmentStageFromAvailability(options: {
    present: boolean;
    fetching?: boolean;
    expired?: boolean;
}): AttachmentTransferStage;
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