FabricJs，Webpack 未编译 - 关键依赖

Question

我正在尝试让 FabricJs 与 Webpack 和 Electron 一起工作，但目前无法正常工作。

Failed to compile.

    ./~/bindings/bindings.js
    76:22-40 Critical dependency: the request of a dependency is an expression

我在尝试使用 Webpack 编译 FabricJs 时得到了它。在 Google 和 Stack Overflow 上搜索过，我还没有找到合适的解决方案。

这是我在运行 DEV 编译时收到的所有警告：

./~/bindings/bindings.js 中的警告 76:22-40 关键依赖：依赖的请求是一个表达式

     WARNING in ./~/bindings/bindings.js
     76:43-53 Critical dependency: the request of a dependency is an expression

 WARNING in ./~/ajv/lib/compile/index.js
 13:21-34 Critical dependency: the request of a dependency is an expression

 WARNING in ./~/ajv/lib/async.js
 96:20-33 Critical dependency: the request of a dependency is an expression

 WARNING in ./~/ajv/lib/async.js
 119:15-28 Critical dependency: the request of a dependency is an expression

在我的main.js代码中，正是这样写的

import Vue from 'vue'
import Electron from 'vue-electron'
import Router from 'vue-router'
import Store from 'vuex'
import {fabric} from 'fabric'

我试过像 import 'fabric' 或 import fabric from 'fabric/dist/fabric.require' 和许多其他方法一样加载它，它总是让我得到相同的结果。

并且 webpack 配置文件分为两个文件 webpack.main.config.js 和 webpack.renderer.config.js

这里是webpack.main.config.js

的内容

'use strict'

process.env.BABEL_ENV = 'main'

const path = require('path')
const pkg = require('./app/package.json')
const settings = require('./config.js')
const webpack = require('webpack')

console.log(pkg.dependencies)

let mainConfig = {
  entry: {
    main: path.join(__dirname, 'app/src/main/index.js')
  },
  externals: Object.keys(pkg.dependencies || {}),
  module: {
    exprContextCritical: false,
    rules: [
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        include: /camo/
      },
      {
        test: /\.json$/,
        loader: 'json-loader'
      },
      {
        test: /\.node$/,
        loader: 'node-loader'
      }
    ]
  },
  node: {
    __dirname: false,
    __filename: false
  },
  output: {
    filename: '[name].js',
    libraryTarget: 'commonjs2',
    path: path.join(__dirname, 'app/dist')
  },
  plugins: [
    new webpack.NoEmitOnErrorsPlugin(),
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': '"production"'
    }),
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false
      }
    })
  ],
  resolve: {
    extensions: ['.js', '.json', '.node'],
    modules: [
      path.join(__dirname, 'app/node_modules')
    ]
  },
  target: 'electron-main'
}

module.exports = mainConfig

这是webpack.renderer.config.js

的内容

'use strict'

process.env.BABEL_ENV = 'renderer'

const path = require('path')
const pkg = require('./app/package.json')
const settings = require('./config.js')
const webpack = require('webpack')

const ExtractTextPlugin = require('extract-text-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')

const AssetsPlugins = require('assets-webpack-plugin')
const assetsPluginInstance = new AssetsPlugins()

let rendererConfig = {
  devtool: '#eval-source-map',
  devServer: { overlay: true },
  entry: {
    renderer: path.join(__dirname, 'app/src/renderer/main.js')
  },
  externals: Object.keys(pkg.dependencies || {}),
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ExtractTextPlugin.extract({
          fallback: 'style-loader',
          use: 'css-loader'
        })
      },
      {
        test: /\.html$/,
        use: 'vue-html-loader'
      },
      {
        test: /\.js$/,
        use: 'babel-loader',
        include: [ path.resolve(__dirname, 'app/src/renderer') ],
        exclude: /node_modules/
      },
      {
            test: /\.js$/,
            loader: 'babel-loader',
            include: /camo/
      },
      {
        test: /\.json$/,
        use: 'json-loader'
      },
      {
        test: /\.node$/,
        use: 'node-loader'
      },
      {
        test: /\.vue$/,
        use: {
          loader: 'vue-loader',
          options: {
            loaders: {
              sass: 'vue-style-loader!css-loader!sass-loader?indentedSyntax=1',
              scss: 'vue-style-loader!css-loader!sass-loader'
            }
          }
        }
      },
      {
        test: /\.(png|jpe?g|gif|svg)(\?.*)?$/,
        use: {
          loader: 'url-loader',
          query: {
            limit: 10000,
            name: 'imgs/[name].[ext]'
          }
        }
      },
      {
        test: /\.(woff2?|eot|ttf|otf)(\?.*)?$/,
        use: {
          loader: 'url-loader',
          query: {
            limit: 10000,
            name: 'fonts/[name].[ext]'
          }
        }
      }
    ]
  },
  plugins: [
    assetsPluginInstance,
    new ExtractTextPlugin('styles.css'),
    new HtmlWebpackPlugin({
      filename: 'index.html',
      template: './app/index.ejs',
      appModules: process.env.NODE_ENV !== 'production'
        ? path.resolve(__dirname, 'app/node_modules')
        : false,
    }),
    new webpack.NoEmitOnErrorsPlugin()
  ],
  output: {
    filename: '[name].js',
    libraryTarget: 'commonjs2',
    path: path.join(__dirname, 'app/dist')
  },
  resolve: {
    alias: {
      'components': path.join(__dirname, 'app/src/renderer/components'),
      'renderer': path.join(__dirname, 'app/src/renderer')
    },
    extensions: ['.js', '.vue', '.json', '.css', '.node'],
    modules: [
      path.join(__dirname, 'app/node_modules'),
      path.join(__dirname, 'node_modules')
    ]
  },
  target: 'electron-renderer'
}


/**
 * Adjust rendererConfig for production settings
 */
if (process.env.NODE_ENV === 'production') {
  rendererConfig.devtool = ''

  rendererConfig.plugins.push(
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': '"production"'
    }),
    new webpack.LoaderOptionsPlugin({
      minimize: true
    }),
    new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false
      }
    })
  )
}

module.exports = rendererConfig

Answer 1

您安装的 fabric 是否没有可选的 cairo 依赖项（只有 needed/useful 在 node 中）？
npm install fabric --no-optional （参见 https://github.com/kangax/fabric.js/issues/2775）
我的解决方法最终使用了 script-loader ，它与在浏览器的

FabricJs，Webpack 未编译 - 关键依赖

FabricJs, Webpack not compiling - Critical dependency

javascript

fabricjs

webpack

vue.js

electron