/** Layout 2 inserts inland ground without moving the underground strip. */
export declare const STARTER_EXPANSION_SEAM_Z = 852;
export declare const STARTER_EXPANSION_ROWS = 128;
/**
 * The generator's (legacy-frame) world height: CHUNK_SIZE * DEMO_CHUNKS_Z in constants.ts (1120 until 2026-10-09, 1248
 * since the Western Entrance grew the south pad by four chunks). Spelled out here because this file must not import
 * constants.ts (expandedContracts.ts re-exports both), and starter-expansion-smoke proves the two agree.
 */
export declare const LEGACY_WORLD_HEIGHT = 1248;
export declare const EXPANDED_WORLD_HEIGHT: number;
export declare const SURFACE_WIDTH = 928;
export declare function shiftSurfaceZ(x: number, z: number): number;
/** Added rows deliberately have no source in the legacy coordinate frame. */
export declare function inverseSurfaceZ(x: number, z: number): number | null;
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