neutrino-dev/packages/neutrino-preset-web

Neutrino Web Preset

This neutrino preset enables building generic web applications with a common configuration for Webpack, ESLint, Babel, Karma+Mocha, along with a static local development server.

^{This preset extends the neutrino-preset-base preset by enhancing it with web-specific configuration.}

Getting started

Install neutrino and neutrino-preset-web as development dependencies in your project:

# npm
npm install --save-dev neutrino neutrino-preset-web

# yarn
yarn add neutrino neutrino-preset-web --dev

Modify your package.json scripts to use the web preset to build your project

{
  "config": {
    "preset": "neutrino-preset-web"
  },
  "scripts": {
    "start": "PORT=4000 neutrino start",
    "build": "neutrino build",
    "test": "neutrino test"
  }
}

Add your source code to src/, which is compiled using Babel's es2015 preset. A number of loaders are pre-configured, allowing you to use import and export for CSS, images, HTML, and JSON. During development, run npm start or yarn start to start a local development server for running the application. When you are ready to build your project into static assets, run npm run build or yarn run build which will create a build/ directory in the root of your project.

If you would like to use testing in your project, create a test/ directory, and write tests in JS files with file names ending in _test.js, e.g. test/homepage_test.js or test/users/admin_test.js. Run tests with npm test or yarn test, which will output results to the console, and also creates test coverage to a .coverage/ directory.

Overriding the preset

There may be times where this preset works well for you, but you need to change some of the defaults it provides. Maybe you don't like the opinion of the ESLint rules, or want to add more types of file loading. Whatever the reason for needing changes, you can either create a custom preset based on this one, or change the values on a project-by-project basis.

To override in your project, create a new file to use as a preset which will modify the existing one, e.g. custom-preset.js:

// bring in the existing preset
const preset = require('neutrino-preset-web');

// modify the preset

// re-export the preset
module.exports = preset;

Now you can pass this file to neutrino to use as the new preset:

{
  "config": {
    "preset": "custom-preset.js"
  }
}

You can also choose to load different presets for different targets if you so wish:

{
  "config": {
    "preset": "custom-preset.js"
  },
  "scripts": {
    "start": "neutrino start",
    "test": "neutrino test --preset some-other-preset",
    "build": "neutrino build --preset neutrino-preset-web"
  }
}

Overriding the default page template

By default, HTML files are built using the template located in src/template.ejs in this repo. If you wish to use a custom template or if the default just doesn't suit your needs, you can create a template.ejs file in your src/ directory, and this preset will pick it up automatically.

Technology

• neutrino-preset-base
• html-webpack-plugin simplifies creation of HTML files to serve webpack bundles
• webpack-dev-server Serves a webpack app. Updates the browser on changes
• Karma Test Runner for JavaScript