错误:无法找到或无法读取导入的文件:~bootstrap/scss/bootstrap

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错误:无法找到或无法读取导入的文件:~bootstrap/scss/bootstrap

我按照 getbootstrap.com 上的说明进行操作,认为一切都会正常工作。然而事实并非如此 :\

直到尝试加载页面时,一切都还好,此时我的 Express.js 应用程序抛出错误:

    [[sass] error: File to import not found or unreadable: ~bootstrap/scss/bootstrap. 
Parent style sheet: .../sass/app.scss at options.error (.../node-sass/lib/index.js:291:26)

我尝试了 npm install,重启服务器,查找 Google、StackOverflow(是的,我知道有很多类似的问题,但它们没有解答我的问题),以及 Bootstrap 4 GitHub 的问题页,但我仍然无法找到答案。

可能是我将依赖项安装在了错误的位置吗?(开发环境而不是生产环境,反之亦然)

为什么会出现这个错误?

我的 webpack.config.js 文件如下所示...

 module.exports = {
  entry: './src/index.js',
  output: {
    path: __dirname + '/public',
    filename: 'bundle.js'
  },
  module: {
    loaders: [
      {
        test: /\.json$/,
        loader: 'json-loader'
      },
      {
        test: /\.js$/,
        loader: 'babel-loader'
      },
      {
        test: /\.(scss)$/,
        use: [{
          loader: 'style-loader', // 将 CSS 注入页面
        }, {
          loader: 'css-loader', // 将 CSS 转换为 CommonJS 模块
        }, {
          loader: 'postcss-loader', // 运行 post CSS 操作
          options: {
            plugins: function () { // postcss 插件,可以导出到 postcss.config.js
              return [
                require('precss'),
                require('autoprefixer')
              ];
            }
          }
        }, {
          loader: 'sass-loader' // 将 Sass 编译为 CSS
        }]
      }
    ]
  }
};

我的 package.json 文件

...
"scripts": {
    "start": "nodemon --exec babel-node server.js --ignore public/",
    "dev": "webpack -wd",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
"dependencies": {
    "axios": "^0.17.1",
    "bootstrap": "^4.0.0",
    "ejs": "^2.5.7",
    "express": "^4.16.2",
    "jquery": "^3.3.1",
    "mongoose": "^5.0.0",
    "node-sass-middleware": "^0.11.0",
    "popper.js": "^1.12.9",
    "precss": "^3.1.0",
    "react": "^16.2.0",
    "react-dom": "^16.2.0"
  },
  "devDependencies": {
    "autoprefixer": "^7.2.5",
    "babel-cli": "^6.26.0",
    "babel-eslint": "^8.2.1",
    "babel-loader": "^7.1.2",
    "babel-preset-env": "^1.6.1",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-2": "^6.24.1",
    "css-loader": "^0.28.9",
    "eslint": "^4.15.0",
    "eslint-plugin-react": "^7.5.1",
    "node-sass": "^4.7.2",
    "nodemon": "^1.14.11",
    "postcss-loader": "^2.0.10",
    "sass-loader": "^6.0.6",
    "style-loader": "^0.19.1",
    "webpack": "^3.10.0"
  }
}

postcss.config.js

module.exports = {
  plugins: [
    require('autoprefixer')
  ]
};

在 app.scss 中我有

@import "custom";
@import "~bootstrap/scss/bootstrap";

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