1.16.4

.\net\minecraft\world\gen\feature\ConfiguredFeatures.class
line 411

SPRUCE = register("spruce", Feature.TREE.configure((new net.minecraft.world.gen.feature.TreeFeatureConfig.Builder(new SimpleBlockStateProvider(ConfiguredFeatures.States.SPRUCE_LOG), new SimpleBlockStateProvider(ConfiguredFeatures.States.SPRUCE_LEAVES), new SpruceFoliagePlacer(UniformIntDistribution.of(2, 1), UniformIntDistribution.of(0, 2), UniformIntDistribution.of(1, 1)), new StraightTrunkPlacer(5, 2, 1), new TwoLayersFeatureSize(2, 0, 2))).ignoreVines().build()));


1.15.2
.\net\minecraft\world\biome\DefaultBiomeFeatures.class
line 601

SPRUCE_TREE_CONFIG = (new Builder(new SimpleBlockStateProvider(SPRUCE_LOG), new SimpleBlockStateProvider(SPRUCE_LEAVES), new SpruceFoliagePlacer(2, 1))).baseHeight(6).heightRandA(3).trunkHeight(1).trunkHeightRandom(1).trunkTopOffsetRandom(2).noVines().build();