export interface StagedExtensionInstall {
    extensionId: string;
    stagingRoot: string;
    stagedExtensionDir: string;
    targetDir: string;
    backupDir?: string;
    committed: boolean;
}
/** Extract, validate, install dependencies, and import-check an extension away from its live path. */
export declare function stageExtensionStoreZip(buffer: Buffer, extensionsDir: string): Promise<StagedExtensionInstall>;
/** Move a staged extension into its live path, preserving the previous version for rollback. */
export declare function commitStagedExtensionInstall(state: StagedExtensionInstall, overwrite: boolean): void;
/** Restore the previous live extension, or remove a newly committed install. */
export declare function rollbackStagedExtensionInstall(state: StagedExtensionInstall): void;
/** Delete the preserved previous version after every durable metadata write succeeds. */
export declare function finalizeStagedExtensionInstall(state: StagedExtensionInstall): void;