javascript - Webpack 配置不接受配置模式选项

Question

** 尝试向 webpack 配置添加模式选项时出现错误我需要配置 {mode:'developement' } 以通过查看此答案启用 hmp github.com/webpack-contrib/webpack-hot-middleware/问题/…**

WebpackOptionsValidationError: Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema. - configuration has an unknown property 'mode'. These properties are valid: object { amd?, bail?, cache?, context?, dependencies?, devServer?, devtool?, entry, externals?, loader?, module?, name?, node?, output?, performance?, plugins?, profile?, recordsInputPath?, recordsOutputPath?, recordsPath?, resolve?, resolveLoader?, stats?, target?, watch?, watchOptions? } For typos: please correct them. For loader options: webpack 2 no longer allows custom properties in configuration. Loaders should be updated to allow passing options via loader options in module.rules. Until loaders are updated one can use the LoaderOptionsPlugin to pass these options to the loader: plugins: [ new webpack.LoaderOptionsPlugin({ // test: /.xxx$/, // may apply this only for some modules options: { mode: ... } }) ] at webpack (C:\Users\asdf\WebstormProjects\node_modules\webpack\lib\webpack.js:19:9) at Object. ( at Module._compile (internal/modules/cjs/loader.js:689:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10) at Module.load (internal/modules/cjs/loader.js:599:32) at tryModuleLoad (internal/modules/cjs/loader.js:538:12) at Function.Module._load (internal/modules/cjs/loader.js:530:3) at Function.Module.runMain (internal/modules/cjs/loader.js:742:12) at startup (internal/bootstrap/node.js:282:19) at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)

    /* eslint-disable */
const path = require('path');
const webpack = require('webpack');
const webpackMerge = require('webpack-merge');
const HtmlWebpackPlugin = require('html-webpack-plugin');

const commonConfig = require('./webpack.config.common');

module.exports = webpackMerge(
  commonConfig,
  {
    devtool: 'cheap-module-eval-source-map',
    entry: {
      main: ['babel-polyfill', 'webpack-hot-middleware/client', './app/index.js'],
    },
    output: {
      path: __dirname,
      publicPath: '/',
      filename: '[hash].bundle.js',
    },
    module: {
      rules: [
        {
          test: /\.mspcss/,
          use: [
            'style-loader',
            'css-loader?modules=true&importLoaders=1&localIdentName=[local]___[hash:base64:5]',
            'resolve-url-loader',
            'sass-loader?sourceMap'
          ]
        },
        {
          test: /\.scss$/,
          use: ['style-loader', 'css-loader', 'sass-loader?sourceMap']
        },
        {
          test: /\.css$/,
          use: ['style-loader', 'css-loader']
        },
      ],
    },
    plugins: [
      new webpack.DefinePlugin({
        'process.env': {
          NODE_ENV: JSON.stringify('development'),
          BABEL_ENV: JSON.stringify('development'),
        },
        __DEV__: true,
      }),
      new webpack.HotModuleReplacementPlugin(),
      new webpack.optimize.OccurrenceOrderPlugin(),
      new webpack.NoErrorsPlugin(),
      new HtmlWebpackPlugin({
        title: 'some- Development',
        template: path.resolve(__dirname, 'index.ejs'),
        filename: path.resolve(__dirname, 'index.html'),
        favicon: 'favicon.ico',
        inject: 'body'
      }),

    ]
  }
)
/* eslint-enable */

Answer 1

您使用的是什么版本的 webpack？您可能使用的是版本 2 或 3，而最新版本的 webpack-dev-server (3.2.1) 以 webpack 4 为目标。我遇到了同样的问题，并通过安装 webpack-dev-server 版本 2.11.5 修复了它

npm uninstall webpack-dev-server
npm i -D webpack-dev-server@2.11.5