import type { ScreenState, UIDiff } from "@loomic/types";
/**
 * UIComposer — applies incremental UI diffs to the current screen state.
 * The model never writes JSX; it emits diffs that this layer applies.
 */
export declare class UIComposer {
    private state;
    constructor(screenId: string);
    getState(): Readonly<ScreenState>;
    /** Take a deep-copy snapshot of the current screen state for rollback. */
    snapshot(): ScreenState;
    /** Restore a previously taken snapshot, discarding current state. */
    restore(snapshot: ScreenState): void;
    applyDiffs(diffs: UIDiff[]): ScreenState;
    private applyDiff;
    private mountNode;
    private unmountNode;
    private reorderNode;
    private updateNodeProps;
    private setNodeVisibility;
}
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