/**
 * Node-safe canonical validation for the server-side data-surface bridge.
 *
 * Keep this leaf free of Svelte imports. The browser-facing smrt-ui barrel
 * includes component modules and is not safe to load from a plain Node server.
 */
export declare function assertDataSurfaceEnvelope(value: unknown): void;
export declare function normalizeDataSurfaceDescriptor(value: unknown): unknown;
export declare function normalizeDataSurfaceSnapshot(value: unknown): unknown;
export declare function normalizeDataSurfaceVisibleCommand(value: unknown): unknown;
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