Leaflet自定义图标，react-leaflet，无法构建Gatsby项目

Question

当我在本地运行

gatsby develop

时，我的传单地图中的自定义图标工作得很好，但是当我尝试构建时，我收到与我的自定义标记图标相关的错误：

 WebpackError: TypeError: leaflet_src_layer_marker__WEBPACK_IMPORTED_MODULE_4__.Icon is not a constructor

相关进口：

import { Map, Marker, Popup, TileLayer, Tooltip, ZoomControl } from 'react-leaflet'
import { Icon } from 'leaflet/src/layer/marker' 

创建自定义图标：

// Init custom map icon
  const mapIcon = MapIcon();
  const markerIcon = new Icon({
    iconUrl: mapIcon,
    iconSize: [36, 36],
    iconAnchor: [18, 18],
    shadowSize: [36, 36],
    shadowUrl: 'https://unpkg.com/[email protected]/dist/images/marker-shadow.png',
    shadowAnchor: [10, 18],
    popupAnchor: [0, -16],
    tooltipAnchor: [13, -4]
  });

JSX：

{ markerData.length > 0 ? markerData.map((node, index) => (
            <Marker position={[node.coords.lat, node.coords.lng]} key={`marker-${index}`} icon={markerIcon}>
              <Popup className="leaflet-popup" onOpen={(el) => openPopup(el)}>
                <h5 className="popup-location-title">{node.location_title}</h5>
                <h6 className="popup-address">{node.address}</h6>
                <div className="popup-description" dangerouslySetInnerHTML={{ __html: node.description }}></div>
                {!!node.embed ?
                  <div className="popup-embed">
                    <Embed url={node.embed} className="popup-media-embed" />
                  </div>
                : null}
              </Popup>
              <Tooltip className="leaflet-tooltip">
                <span className="title">{node.location_title}</span>
                <span className="address">{node.address}</span>
              </Tooltip>
            </Marker>
          )) : null }

我已经尝试了此处列出的所有解决方案：https://github.com/Leaflet/Leaflet.markercluster/issues/874。我也看过几个类似的问题。似乎没有什么帮助。例如，我也尝试像这样

import * as L from "leaflet"

和像这样

import L from "leaflet"

导入传单。然后创建新图标，像这样

const markerIcon = L.Icon({

，像这样

const markerIcon = L.icon({

，像这样

const markerIcon = new L.Icon({

，像这样

const markerIcon = new L.icon({

。我可以

console.log(L)

，但这些都不起作用。

我希望得到一些帮助。

Answer 1

可以构建它了。我必须将图标结构包装在窗口对象的检查中：

// Init custom map icon
  if (typeof window !== 'undefined') {
    const mapIcon = MapIcon();
    markerIcon = new Icon({
      iconUrl: mapIcon,
      iconSize: [36, 36],
      iconAnchor: [18, 18],
      shadowSize: [36, 36],
      shadowUrl: 'https://unpkg.com/[email protected]/dist/images/marker-shadow.png',
      shadowAnchor: [10, 18],
      popupAnchor: [0, -16],
      tooltipAnchor: [13, -4]
    });
  }

再次将图标传递给标记时：

<Marker position={[node.coords.lat, node.coords.lng]} key={`marker-${index}`} icon={(!!markerIcon) ? markerIcon : null}>

Answer 2

in my case i had to wrap the icon with this form 

let icon = ""
if(typeof window !== 'undefined'){
icon = Leaflet.icon({
    iconUrl: PointerIcon,
    iconSize: [38, 38],
});
}

and add the same validation in the component that is calling it