import type { RuntimeManifestIdentity } from './runtime-manifest.js';
import type { RuntimePromotionBackupResult, RuntimePromotionFilesystemAuthority, RuntimePromotionInstallResult } from './runtime-promotion-filesystem-types.js';
/**
 * Move an exact destination runtime aside as the operation's rollback backup.
 *
 * @throws When filesystem authority, manifest, ownership, or durability verification fails.
 */
export declare function backupRuntimePromotionDestination(authority: RuntimePromotionFilesystemAuthority, expected: RuntimeManifestIdentity): Promise<RuntimePromotionBackupResult>;
/**
 * Install the verified runtime stage into the destination runtime path.
 *
 * @throws When filesystem authority, manifest, ownership, or durability verification fails.
 */
export declare function installRuntimePromotionStage(authority: RuntimePromotionFilesystemAuthority, expected: RuntimeManifestIdentity): Promise<RuntimePromotionInstallResult>;
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