export interface AttachmentReference {
    readonly version: 1;
    readonly sessionId: string;
    readonly fileId: string;
}
export interface PartReference extends AttachmentReference {
    readonly family: string;
    readonly partId: string;
}
export interface CursorPayload {
    readonly version: 1;
    readonly partRef: string;
    readonly sourceSha256: string;
    readonly offset: number;
}
export declare function createAttachmentRef(sessionId: string, fileId: string): string;
export declare function parseAttachmentRef(value: string): AttachmentReference;
export declare function createPartRef(sessionId: string, fileId: string, family: string, partId: string): string;
export declare function parsePartRef(value: string): PartReference;
export declare function sessionDirectoryName(sessionId: string): string;
export declare function createCursor(input: {
    readonly partRef: string;
    readonly sourceSha256: string;
    readonly offset: number;
}): string;
export declare function parseCursor(cursor: string, expected: {
    readonly partRef: string;
    readonly sourceSha256: string;
}): CursorPayload;