import seedrandom from 'seedrandom';
/**
 * Heightmap Generator
 *
 * Generates deterministic heightmaps using layered Perlin/Simplex noise.
 * Inspired by Azgaar's heightmap-generator.js but implemented independently.
 *
 * Reference: reference/AZGAAR_SNAPSHOT.md Section 1
 */
export interface HeightmapOptions {
    /** Seed for deterministic generation */
    seed: string;
    /** Width of heightmap grid */
    width: number;
    /** Height of heightmap grid */
    height: number;
    /** Number of octaves (noise layers) for detail */
    octaves?: number;
    /** Persistence (amplitude decay per octave) */
    persistence?: number;
    /** Lacunarity (frequency increase per octave) */
    lacunarity?: number;
    /** Land ratio target (0-1, default 0.3 for ~30% land) */
    landRatio?: number;
}
export interface Heightmap {
    width: number;
    height: number;
    /** Flat array of elevation values (0-100) */
    data: Uint8Array;
    /** Sea level threshold (typically 20) */
    seaLevel: number;
}
/**
 * Generate a heightmap from a seed
 */
export declare function generateHeightmap(seed: string, width: number, height: number, options?: Partial<HeightmapOptions>): Uint8Array;
/**
 * Add ridges/tectonic features to heightmap
 *
 * Inspired by Azgaar's "Range" primitive for mountain ranges.
 */
export declare function addRidges(heightmap: Uint8Array, width: number, height: number, rng: seedrandom.PRNG, count?: number): Uint8Array;
/**
 * Smooth heightmap to reduce jaggedness
 *
 * Applies a simple averaging filter.
 */
export declare function smoothHeightmap(heightmap: Uint8Array, width: number, height: number, iterations?: number): Uint8Array;
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