export type BackendFederationManifestAdapterErrorCode = 'manifest_unavailable' | 'manifest_invalid' | 'remote_unavailable' | 'strict_effect_required' | 'timeout' | 'version_mismatch';
export declare const BACKEND_FEDERATION_MANIFEST_ADAPTER_FAILURE_EVENT: 'modernjs:microvertical-server-fallback';
export declare class BackendFederationManifestAdapterError extends Error {
    code: BackendFederationManifestAdapterErrorCode;
    readonly failureEvent: "modernjs:microvertical-server-fallback";
    details?: Record<string, unknown>;
    constructor(code: BackendFederationManifestAdapterErrorCode, message: string, cause?: unknown, details?: Record<string, unknown>);
}
export declare function assertManifestAdapter(condition: unknown, code: BackendFederationManifestAdapterErrorCode, message: string): asserts condition;
export declare function assertVersionValue(actual: string | undefined, expected: string | undefined, label: string, details?: Record<string, unknown>): void;
export declare function assertConsistentValue(left: string | undefined, right: string | undefined, label: string, details?: Record<string, unknown>): void;