react-bkoi-gl/dist/utils/style-utils.js

React components for Barikoi GL JS

const refProps = ["type", "source", "source-layer", "minzoom", "maxzoom", "filter", "layout"];
export function normalizeStyle(style) {
  if (!style) {
    return null;
  }
  if (typeof style === "string") {
    return style;
  }
  if ("toJS" in style) {
    style = style.toJS();
  }
  if (!style.layers) {
    return style;
  }
  const layerIndex = {};
  for (const layer of style.layers) {
    layerIndex[layer.id] = layer;
  }
  const layers = style.layers.map(layer => {
    let normalizedLayer = null;
    if ("interactive" in layer) {
      normalizedLayer = Object.assign({}, layer);
      delete normalizedLayer.interactive;
    }
    const layerRef = layerIndex[layer.ref];
    if (layerRef) {
      normalizedLayer = normalizedLayer || Object.assign({}, layer);
      delete normalizedLayer.ref;
      for (const propName of refProps) {
        if (propName in layerRef) {
          normalizedLayer[propName] = layerRef[propName];
        }
      }
    }
    return normalizedLayer || layer;
  });
  return {
    ...style,
    layers
  };
}
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