maplibre-gl/src/style/create_style_layer.ts

import circle from './style_layer/circle_style_layer';
import heatmap from './style_layer/heatmap_style_layer';
import hillshade from './style_layer/hillshade_style_layer';
import fill from './style_layer/fill_style_layer';
import fillExtrusion from './style_layer/fill_extrusion_style_layer';
import line from './style_layer/line_style_layer';
import symbol from './style_layer/symbol_style_layer';
import background from './style_layer/background_style_layer';
import raster from './style_layer/raster_style_layer';
import CustomStyleLayer from './style_layer/custom_style_layer';
import type {CustomLayerInterface} from './style_layer/custom_style_layer';

import type {LayerSpecification} from '../style-spec/types.g';

const subclasses = {
    circle,
    heatmap,
    hillshade,
    fill,
    'fill-extrusion': fillExtrusion,
    line,
    symbol,
    background,
    raster
};

export default function createStyleLayer(layer: LayerSpecification | CustomLayerInterface) {
    if (layer.type === 'custom') {
        return new CustomStyleLayer(layer);
    } else {
        return new subclasses[layer.type](layer);
    }
}