javascript - webpack val loader 导致异常

Question

我正在尝试在 webpack 编译时动态包含 .js 文件。

我不想使用上下文来加载环境变量，因为我的代码中没有这些神奇的变量。

我想做的是使用 val 加载器来执行模块。使用环境变量来决定导入哪个模块。并导出该模块。

但是，这会导致其他加载器抛出错误。

这是我的目录布局

--base
  --src
    app.js
    test.js
  webpack.config.js
  rawr.js

这是我的 webpack.config.js 文件

var path = require('path');
var webpack = require('webpack');
// var process = require('process');

var env = require(process.env.NODE_ENV || './devConf.js');

module.exports = {
    // Specify logical root of the sourcecode
    plugins: [
        new webpack.DefinePlugin(env)
    ],
    context: path.join(__dirname, '/src'),
    entry: {
    app: ['bootstrap.js'],
  },

    // Specify where to put the results
    output: {
        path: path.join(__dirname, '/dist'),
        filename: 'build.js'
    },

    // Specify logical root of package imports so as to avoid relative path everywhere
    resolve: {
        root: path.join(__dirname, '/src'),
        // What files we want to be able to import
        extensions: ['', '.js', '.css', '.less'],
    },

    module: {
        preLoaders: [
            // Lint all js before compiling
            /*{
                test: /\.js$/,
                exclude: /node_modules/,
                loader: 'eslint-loader'
            }*/
        ],
        loaders: [
            {
                test: /\.js$/,
                query: {
                    presets: ['es2015']
                },
                exclude: /node_modules/,
                loader: 'babel'
            },
            {
                test: /\.tpl\.html$/,
                exclude: /node_modules/,
                loader: 'ngtemplate?relativeTo=/src/!html'
            },
      {
        test: /\.scss$/,
        loaders: ["style", "css", "sass"]
      },
      {
        test: /\.css$/,
        loaders: ["style", "css"]
      }
        ]
    },

    // Dev server settings
    devServer: {
        contentBase: path.join(__dirname, '/dist'),
        noInfo: false,
        hot: true
    },

    // ESLint config
    eslint: {
        configFile: path.join(__dirname, '.eslintrc')
    }
};

我的 js 文件如下所示

// app.js
let b = require('val!test.js');

// test.js
var process = require('process');
loadedModule = require(process.env.NODE_ENV) // NODE_ENV='./rawr.js'
export const myString = loadedModule

// rawr.js
module.exports.test = "hello world";

我遇到的异常:

ERROR in ./src/app/app.js
Module parse failed: /home/smaug/Projects/angular-template/node_modules/babel-loader/index.js?{"presets":["es2015"]}!/home/smaug/Projects/angular-template/src/app/app.js Line 1: Unexpected identifier
You may need an appropriate loader to handle this file type.
| 'use strict';
| 
| require('angular-animate');
 @ ./src/bootstrap.js 7:0-18

这与我想做的事情无关。但是如果我删除 require('val!...') 语句，它就会消失。

有什么想法吗？

更新:

如果我将 require 语句更改为

let b = require('val!./test.js');

我收到以下错误:

ERROR in ./~/val-loader!./src/app/test.js
Module build failed: Error: Final loader didn't return a Buffer or String
    at DependenciesBlock.onModuleBuild (/home/smaug/Projects/angular-template/node_modules/webpack-core/lib/NormalModuleMixin.js:299:42)
    at nextLoader (/home/smaug/Projects/angular-template/node_modules/webpack-core/lib/NormalModuleMixin.js:275:25)
    at /home/smaug/Projects/angular-template/node_modules/webpack-core/lib/NormalModuleMixin.js:292:15
    at runSyncOrAsync (/home/smaug/Projects/angular-template/node_modules/webpack-core/lib/NormalModuleMixin.js:160:12)
    at nextLoader (/home/smaug/Projects/angular-template/node_modules/webpack-core/lib/NormalModuleMixin.js:290:3)
    at /home/smaug/Projects/angular-template/node_modules/webpack-core/lib/NormalModuleMixin.js:292:15
    at Object.context.callback (/home/smaug/Projects/angular-template/node_modules/webpack-core/lib/NormalModuleMixin.js:148:14)
    at Object.module.exports (/home/

Answer 1

// app.js
let b = require('val!./test.js');