Chunk Generator

const fooNoise = WorldgenRegistries.NOISE.register(Identifier.parse('test:foo'),
    { firstOctave: -5, amplitudes: [1, 1] })
const noiseSettings = NoiseSettings.create({ minY: 0, height: 256 })
const settings = NoiseGeneratorSettings.create({
    defaultBlock: BlockState.STONE,
    defaultFluid: BlockState.WATER,
    seaLevel: 63,
    noise: noiseSettings,
    noiseRouter: NoiseRouter.create({
        finalDensity: new DensityFunction.Ap2('add',
            new DensityFunction.YClampedGradient(0, 256, 1, -1),
            new DensityFunction.Noise(1, 1, fooNoise)
        ),
    }),
})

const randomState = new RandomState(settings, BigInt(125))
const generator = new NoiseChunkGenerator(null, settings)
const chunk = new Chunk(noiseSettings.minY, noiseSettings.height, ChunkPos.create(0, 0))
generator.fill(randomState, chunk)

Chunk generator (loading)