docs: function removeLayerFromSplitMaps(state, layer) {
    return state.splitMaps.map(settings => {
      const {layers} = settings;
      /* eslint-disable no-unused-vars */
      const {[layer.id]: _, ...newLayers} = layers;
      /* eslint-enable no-unused-vars */
      return {
        ...settings,
        layers: newLayers
      };
    });
  }