How do i prevent a .js file being bundled by webpack

问题

Hi I am currently using webpack to bundle my project files into a single file. However, I do not want webpack to bundle my config.js file where all my config is set. I would like to this remain separate in the output folder but not sure out to achieve this.

my current setup is

//index.js file
#!/usr/bin/env node
'use strict';
let config = require('config.js);
let read = require('read.js);
console.log('i am running through command line');

//read.js file
'use strict'
console.log('read a text file');

//config.js 
'use strict';
module.exports = {
name: 'test'
}

//webpack.config.js
let webpack = require('webpack');
let path = require('path');
let fs = require('fs');

let nodeModules = {};
fs.readdirSync('node_modules')
.filter(function (x) {
    return [ '.bin' ].indexOf(x) === -1;
})
.forEach(function (mod) {
    nodeModules[mod] = 'commonjs ' + mod;
});

module.exports = {
entry: [ 'babel-polyfill', './index.js' ],
target: 'node',
node: {
    __dirname: true
},
output: {
    path: path.join(__dirname, 'webpack_bundle'),
    filename: '[name].js',
    libraryTarget: 'commonjs'
},
module: {
    loaders: [
        {
            test: /\.js$/,
            loader: 'shebang-loader'
        },
        {
            test: /\.js$/,
            loader: 'babel-loader',
            query: {
                presets: [ 'es2015' ]
            }
        } ]
},
resolve: {
    extensions: [ '.js' ]
},
plugins: [
    new webpack.BannerPlugin({banner: '#!/usr/bin/env node', raw: true 
})
]
,
    externals: nodeModules
};

Note: I have significantly simplified the code example for brevity

Currently when i run the webpack command i get a folder webpack_bundle which contains an index.js file - the index.js file includes the dependencies config.js and read.js. However, what i would like is for the read.js dependency to be bundled into the index.js file but the config.js dependency to stay external in a separate file which gets required by the bundled webpack output. So the folder webpack_bundle should contain two files after running the webpack command - index.js and config.js. I have already tried to modify the externals by adding the following key value to the externals object config: './config.js' but this did not work. I also created an extra entrypoint by specifying config.js as the entrypoint but this also did not work. I can't figure this out and the webpack docs are not that clear on how to achieve this. Please help!

回答1:

If you want your config in a separate bundle, you can create a split point, by importing dynamically your config.js file with require.ensure:

require.ensure([], function() {
  let config = require('./config.js');
});

Your config will then be in a separate bundle.

Documentation about Code splitting (warning: Webpack 1.x is deprecated).
Documentation about Code Splitting (Webpack 2).

Edit:

If you don't want your config file to be bundled by Webpack, I think you can use IgnorePlugin:

module.exports = {
  //...
  plugins: [new webpack.IgnorePlugin(/^\.\/config\.js$/)]
}

And use copy-webpack-plugin to copy your config.js file.

来源：https://stackoverflow.com/questions/43368399/how-do-i-prevent-a-js-file-being-bundled-by-webpack

标签

javascript

node.js

configuration

Webpack

external