/**
 * Perlin noise generator with FBM (Fractional Brownian Motion) support
 * Used for natural-looking procedural distribution patterns
 */
export declare class PerlinNoise {
    private permutation;
    private grad3;
    constructor(seed: number);
    private fade;
    private lerp;
    private grad;
    /**
     * Sample 2D Perlin noise
     * @param x - X coordinate
     * @param y - Y coordinate
     * @returns Noise value between 0 and 1
     */
    noise2D(x: number, y: number): number;
    /**
     * Sample Fractional Brownian Motion (multi-octave noise)
     * @param x - X coordinate
     * @param y - Y coordinate
     * @param octaves - Number of noise octaves to combine
     * @param persistence - Amplitude multiplier per octave (0-1)
     * @param lacunarity - Frequency multiplier per octave (typically 2)
     * @param scale - Base frequency scale
     * @returns Combined noise value between 0 and 1
     */
    fbm2D(x: number, y: number, octaves: number, persistence: number, lacunarity: number, scale?: number): number;
}
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