React-Leaflet 与 Gatsby

Question

我在尝试修复 React-Leaflet / Leaflet 期望 window 被定义并导致 Gatsby 构建 npm run build 失败时遇到问题。

错误信息：

WebpackError: window is not defined

  - leaflet-src.js:230
    ~/leaflet/dist/leaflet-src.js:230:1

  - leaflet-src.js:7 version
    ~/leaflet/dist/leaflet-src.js:7:1

  - leaflet-src.js:10 Object.exports.__esModule
    ~/leaflet/dist/leaflet-src.js:10:2

  - AttributionControl.js:5 Object.<anonymous>
    ~/react-leaflet/lib/AttributionControl.js:5:1

  - index.js:26 Object.exports.__esModule
    ~/react-leaflet/lib/index.js:26:1

  - map.js:2 Object.exports.__esModule
    src/pages/map.js:2:1

Gatsby 文档列出了一些可能的场景或解决方案。 https://www.gatsbyjs.org/docs/debugging-html-builds/#fixing-third-party-modules

因此，通过尝试按照列出的示例，我尝试添加 gatsby-node.js

盖茨比-node.js

exports.modifyWebpackConfig = ({ config, stage }) => {
  if (stage === 'build-html') {
    config.loader('null', {
      test: /react-leaflet/,
      loader: 'null-loader',
    })
  }
}

test: /leaflet/ 和 test: /react-leaflet/

But that spits out a WebpackError: Minified React error #130

如果能帮助我消除这些构建错误，我将不胜感激。

非常感谢。

步骤和代码

$ gatsby new leaflet
$ cd leaflet && npm install
安装包和依赖项$ npm install react-leaflet leaflet react react-dom
已创建src/pages/map.js
复制/粘贴 https://github.com/PaulLeCam/react-leaflet/blob/master/example/components/simple.js

map.js

import React, { Component } from 'react'
import { Map, TileLayer, Marker, Popup } from 'react-leaflet'

export default class SimpleExample extends Component {
  state = {
    lat: 51.505,
    lng: -0.09,
    zoom: 13,
  }

  render() {
    const position = [this.state.lat, this.state.lng]
    return (
      <Map center={position} zoom={this.state.zoom}>
        <TileLayer
          attribution="&amp;copy <a href=&quot;http://osm.org/copyright&quot;>OpenStreetMap</a> contributors"
          url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
        />
        <Marker position={position}>
          <Popup>
            A pretty CSS3 popup. <br /> Easily customizable.
          </Popup>
        </Marker>
      </Map>
    )
  }
}

Answer 1

我会使用您拥有的 modifyWebpackConfig 代码。缩小错误是因为现在 react-leaflet 是一个空模块，当它尝试使用 react-leaflet 组件构建任何页面时，它会导致错误。您必须将您的地图包裹在支票中以查看 window 是否可用。这样它将在服务器端渲染中被跳过。

在 React 中它看起来像这样。

render() {
    if (typeof window !== 'undefined') {
        return (
            <Map {...options}>

            </Map>
        )
    }
    return null
}

Answer 2

根据 2019 年 10 月的 Gatsby 版本提醒未来的读者； API 与 OP 版本相比有一些变化。

盖茨比-node.js


exports.onCreateWebpackConfig = ({ stage, loaders, actions }) => {
  if (stage === 'build-html') {
    actions.setWebpackConfig({
      module: {
        rules: [
          {
            test: /react-leaflet|leaflet/,
            use: loaders.null(),
          },
        ],
      },
    })
  }
}

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