import type { WorkspaceBackend, WorkspaceReservation, ManifestWriteResult } from "./workspace_sync.js";
/** The broker surface this backend needs (RunnerControlClient satisfies it). */
export interface WorkspaceBrokerTransport {
    workspaceReserve(totalBytes: number): Promise<WorkspaceReservation>;
    workspaceManifestRead(): Promise<{
        manifest: string | null;
        generation: string | null;
    }>;
    workspaceManifestWrite(manifest: string, expected: string | null, totalBytes: number): Promise<ManifestWriteResult>;
    workspacePacksExist(digests: readonly string[]): Promise<string[]>;
    workspacePackUrls(op: "put" | "get", digests: readonly string[]): Promise<Record<string, string>>;
    workspacePacksDelete(digests: readonly string[]): Promise<void>;
    uploadBytes(url: string, headers: Record<string, string>, body: Uint8Array): Promise<void>;
    downloadBytes(url: string): Promise<Uint8Array | null>;
}
export declare class BrokerWorkspaceBackend implements WorkspaceBackend {
    private readonly broker;
    /** The scope's live footprint, carried from the reserve so the manifest write can record what
     *  actually landed rather than re-deriving it. */
    private lastReservedBytes;
    constructor(broker: WorkspaceBrokerTransport);
    reserve(totalBytes: number): Promise<WorkspaceReservation>;
    readManifest(): Promise<{
        bytes: Uint8Array | null;
        generation: string | null;
    }>;
    writeManifest(bytes: Uint8Array, expected: string | null): Promise<ManifestWriteResult>;
    existingPacks(digests: readonly string[]): Promise<ReadonlySet<string>>;
    writePack(digest: string, bytes: Uint8Array): Promise<void>;
    readPack(digest: string): Promise<Uint8Array | null>;
    deletePacks(digests: readonly string[]): Promise<void>;
}