Node Webpack eval()源图

时间:2017-08-20 09:05:03

标签: javascript node.js typescript webpack babel

我正在努力使用TypeScript设置Node项目。 我的工作流程是:我使用nodemon运行Node脚本。节点脚本创建webpack编译器实例并将文件系统设置为MemoryFS。 webpack配置包括TypeScript和Babel的加载器。 webpack完成编译后,如果有错误,我会抛弃,如果没有,我用MemoryFS和eval()获取结果来运行代码。

所有这一切都很好。但我试图添加源图支持。我在webpack中添加了一个横幅插件,添加了“源映射支持”。在webpack中,我将devtool设置为“source-map'”。在tsconfig.json中,我启用了sourcemaps选项。在src / index.ts中我只是抛出一个错误,并且在运行时Node并没有告诉我错误发生在哪里。 (源图)

但是如果我正常运行webpack,然后我使用node dist/bundle.js运行它。它正在发挥作用。

我认为有一个问题,因为我使用eval()来运行编译的输出。

的src / index.ts:

console.log('Hello world');

throw new Error('not');

build.js:

const path = require('path');
const webpack = require('webpack');
const MemoryFS = require('memory-fs');

const fs = new MemoryFS();

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

const compiler = webpack(config);

compiler.outputFileSystem = fs;

compiler.run((err, stats) => {
    console.clear();

    const jsonStats = stats.toJson();

    if(jsonStats.errors.length > 0 || jsonStats.warnings.length > 0)
        return console.log(jsonStats.warning, jsonStats.errors);

    const result = fs.readFileSync(path.resolve(__dirname, 'dist', 'bundle.js')).toString();

    eval(result);
});

webpack.config.js:

const path = require('path');
const webpack = require('webpack');

const SRC_DIR = path.resolve(__dirname, 'src');
const DIST_DIR = path.resolve(__dirname, 'dist');

module.exports = {
    entry: SRC_DIR + '/index.ts',
    output: {
        path: DIST_DIR,
        filename: 'bundle.js'
    },
    devtool: 'source-map',
    module: {
        rules: [
            {
                test: /\.js$/,
                use: 'babel-loader'
            },
            {
                test: /\.ts$/,
                use: [
                    { loader: 'babel-loader' },
                    { loader: 'ts-loader' },
                    { loader: 'tslint-loader' }
                ]
            }
        ]
    },
    resolve: {
        extensions: ['.ts', '.js', '.json']
    },
    target: 'node',
    plugins: [
        new webpack.BannerPlugin({
            raw: true,
            entryOnly: false,
            banner: 'require("source-map-support").install();'
        }),
        new webpack.NoEmitOnErrorsPlugin()
    ]
};

正常运行webpack并按预期执行代码(webpack && node dist\bundle.js):

C:\Users\shachar\Desktop\graph\dist\webpack:\src\index.ts:3
throw new Error('not');
    ^
Error: not
    at Object.<anonymous> (C:\Users\shachar\Desktop\graph\dist\webpack:\src\index.ts:3:7)
    at __webpack_require__ (C:\Users\shachar\Desktop\graph\dist\webpack:\webpack\bootstrap a6ba0885ca7e8b14ee63:19:1)
    at C:\Users\shachar\Desktop\graph\dist\webpack:\webpack\bootstrap a6ba0885ca7e8b14ee63:62:1
    at Object.<anonymous> (C:\Users\shachar\Desktop\graph\dist\bundle.js:67:10)
    at Module._compile (module.js:573:30)
    at Object.Module._extensions..js (module.js:584:10)
    at Module.load (module.js:507:32)
    at tryModuleLoad (module.js:470:12)
    at Function.Module._load (module.js:462:3)
    at Function.Module.runMain (module.js:609:10)

使用build.js

运行它
Hello world
Error: not
    at Object.eval (eval at compiler.run (C:\Users\shachar\Desktop\graph\build.js:23:5), <anonymous>:75:7)
    at __webpack_require__ (eval at compiler.run (C:\Users\shachar\Desktop\graph\build.js:23:5), <anonymous>:21:30)
    at eval (eval at compiler.run (C:\Users\shachar\Desktop\graph\build.js:23:5), <anonymous>:64:18)
    at eval (eval at compiler.run (C:\Users\shachar\Desktop\graph\build.js:23:5), <anonymous>:67:10)
    at compiler.run (C:\Users\shachar\Desktop\graph\build.js:23:5)
    at emitRecords.err (C:\Users\shachar\Desktop\graph\node_modules\webpack\lib\Compiler.js:269:13)
    at Compiler.emitRecords (C:\Users\shachar\Desktop\graph\node_modules\webpack\lib\Compiler.js:375:38)
    at emitAssets.err (C:\Users\shachar\Desktop\graph\node_modules\webpack\lib\Compiler.js:262:10)
    at applyPluginsAsyncSeries1.err (C:\Users\shachar\Desktop\graph\node_modules\webpack\lib\Compiler.js:368:12)
    at next (C:\Users\shachar\Desktop\graph\node_modules\tapable\lib\Tapable.js:218:11)

感谢您的帮助!

1 个答案:

答案 0 :(得分:0)

当您使用eval运行代码时,Node将不知道源地图。也许您可以尝试运行子节点进程而不是使用eval来运行结果,或者您是否有任何理由使用eval?见https://nodejs.org/api/child_process.html#child_process_child_process_exec_command_options_callback