01 Production bundle

In this example we are going to create a production bundle using webpack.

We will start from 00-boilerplate.

Steps to build it

• npm install to install previous sample packages:

npm install

• First, we will check the current base and dev webpack configuration.

• Then, we need to add a new file prod.js using production mode:

./config/webpack/prod.js

const { merge } = require('webpack-merge');
const base = require('./base');

module.exports = merge(base, {
  mode: 'production',
});

• As we did on dev, we have to configure the ouput:

./config/webpack/prod.js

const { merge } = require('webpack-merge');
const base = require('./base');
+ const helpers = require('./helpers');

module.exports = merge(base, {
  mode: 'production',
+ output: {
+   path: helpers.resolveFromRootPath('dist'),
+   filename: './js/[name].[chunkhash].js',
+   assetModuleFilename: "./images/[hash][ext][query]",
+ },
});

NOTE: Remember to add chunkhash to avoid cache issues.

• Next one, it's apply optimization to split node_modules as different chunk from app:

./config/webpack/prod.js

...
  output: {
    path: helpers.resolveFromRootPath('dist'),
    filename: './js/[name].[chunkhash].js',
    assetModuleFilename: './images/[hash][ext][query]',
  },
+ optimization: {
+   runtimeChunk: 'single',
+   splitChunks: {
+     cacheGroups: {
+       vendor: {
+         chunks: 'all',
+         name: 'vendor',
+         test: /[\\/]node_modules[\\/]/,
+         enforce: true,
+       },
+     },
+   },
+ },
});

• Finally, we will provide a different env variables for production:

./prod.env

NODE_ENV=production
ORGANIZATION=facebook

• And use it:

./config/webpack/prod.js

const { merge } = require('webpack-merge');
+ const Dotenv = require('dotenv-webpack');
const base = require('./base');
...
  optimization: {
    runtimeChunk: 'single',
    splitChunks: {
      cacheGroups: {
        vendor: {
          chunks: 'all',
          name: 'vendor',
          test: /[\\/]node_modules[\\/]/,
          enforce: true,
        },
      },
    },
  },
+ plugins: [
+   new Dotenv({
+     path: 'prod.env',
+   }),
+ ],
});

• Now, we can add the build command:

./package.json

...
  "scripts": {
    "start": "run-p -l type-check:watch start:dev",
    "start:dev": "webpack-dev-server --config ./config/webpack/dev.js",
+   "build": "run-p -l type-check build:prod",
+   "build:prod": "npm run clean && webpack --config ./config/webpack/prod.js",
    "type-check": "tsc --noEmit",
    ...
  },

• Run it:

npm run build

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