Create Webpack Config

A utility for creating webpack configs with common settings

About

This utility will create a webpack config that should function as a drop-in for any Javascript or TypeScript project.

It features:

• Tree shaking
• Circular dependency checking
• Synthetic default imports (TypeScript)
• Project root alias (^)
• Type checking in separate worker
• Transpiling from ES6+ (and React) to target browsers
• Polyfilling ES6+ features

Installation

Install @dabapps/create-webpack-config:

npm i @dabapps/create-webpack-config -S

Install peer dependencies (TypeScript must be at least version 2):

npm i typescript webpack@4 webpack-cli@3 core-js@3 -S

Setup

Creating your config

Create a file called webpack.config.js and add the following contents, adjusting options as desired.

This will bundle your index.ts file and all dependencies into a bundle.js in the static/build/js directory.

webpack.config.js

const createWebpackConfig = require('@dabapps/create-webpack-config');

module.exports = createWebpackConfig({
  input: './static/src/ts/index.ts',
  outDir: './static/build/js',
  tsconfig: './tsconfig.dist.json',
  env: {
    NODE_ENV: 'production'
  }
});

If you require multiple bundles you can supply an object as the input. Files will be created in the outDir with names corresponding to the keys in your input object.

The following config will create static/build/js/frontend-bundle.js and static/build/js/admin-bundle.js.

webpack.config.js

const createWebpackConfig = require('@dabapps/create-webpack-config');

module.exports = createWebpackConfig({
  input: {
    frontend: './static/src/ts/index.ts',
    admin: './static/src/ts/admin.ts'
  },
  outDir: './static/build/js',
  tsconfig: './tsconfig.dist.json',
  env: {
    NODE_ENV: 'production'
  }
});

If you would like to be able to import "raw" files as strings, you can provide a rawFileExtensions option, with a list of file extension that should be imported as strings e.g.

{
  rawFileExtensions: ['html', 'xml', 'txt', 'csv']
}

If you require multiple bundles, but your source files do not both have the same parent directory, you will have to manually supply a rootDir option in order to use the root dir alias (^) e.g.

{
  input: {
    frontend: './src/frontend/index.ts',
    admin: './src/admin/index.ts'
  },
  rootDir: './src'
}

In order to transpile files outside of the main file's parent directory or the specified rootDir, you will need to add an include option with the additional path(s) to transpile, though this is not usually necessary.

The include option can be either a string or array of strings.

{
  input: 'src/index.ts',
  include: ['./examples', './docs']
}

Browser support

Create a .browserslistrc file in the root of your project and add the following contents, adjusting as desired.

This file is used by webpack, and other tools such as autoprefixer to make our code compatible with the browsers we want to support.

.browserslistrc

last 10 Chrome versions
last 10 Firefox versions
last 10 Edge versions
last 10 iOS versions
last 10 Android versions
last 10 Opera versions
last 10 Safari versions
last 10 ExplorerMobile versions
Explorer >= 9

TypeScript base config

Create a tsconfig.json in the root of the project and add the following contents, adjusting include, paths, and typeRoots as needed.

This will contain all of our base TypeScript config.

By default allowJs is set to false. If your project contains Javascript you should set this to true.

You may enable type checking on Javascript files by setting checkJs to true. This can be useful if migrating a Javascript project to TypeScript.

allowSyntheticDefaultImports and esModuleInterop allow us to import modules that don't have default exports as if they did, in TypeScript, so that we can be consistent across Javascript and TypeScript projects. E.g. import React from 'react'; as opposed to import * as React from 'react';

tsconfig.json

{
  "compilerOptions": {
    "strict": true,
    "noImplicitAny": true,
    "pretty": true,
    "sourceMap": true,
    "skipLibCheck": true,
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "allowJs": false,
    "checkJs": false,
    "jsx": "react",
    "target": "es6",
    "moduleResolution": "node",
    "typeRoots": [
      "./node_modules/@types/",
      "./static/src/ts/types/"
    ],
    "baseUrl": "./",
    "paths": {
      "^*": [
        "./static/src/ts*"
      ]
    }
  },
  "include": [
    "./static/src/ts/"
  ]
}

TypeScript distribution config

Create a tsconfig.dist.json file in the root of your project and add the following contents, adjusting exclude, or replacing with include as needed.

This is necessary to allow us to build our source without also type checking our tests or other Javascript and TypeScript files in the project.

tsconfig.dist.json

{
  "extends": "./tsconfig.json",
  "exclude": [
    "./static/src/ts/__tests__/",
    "./static/src/ts/__mocks__/"
  ]
}

Build scripts

Add the following scripts to your package.json.

package.json

{
  "scripts": {
    "build-js": "webpack --mode production",
    "watch-js": "webpack --mode development --watch"
  }
}

Code of conduct

For guidelines regarding the code of conduct when contributing to this repository please review https://www.dabapps.com/open-source/code-of-conduct/