Front End Configuration for Prototyping

Front-end configuration has become an important part of front-end development. Speeding up configuration for prototyping purposes can be very important to learning about what is being prototyped. Approximately a decade ago, front end development consisted of HTML, CSS, and JavaScript. Front-end development is often a lot more complex now. It includes linting, bundling, transpiling, and testing. When prototyping, it is important to get up and run as fast as possible. This post will document changes in front-end development between then and now. It will briefly describe a current observed pain point—how difficult it can be when having to break aware standard configuration. It will, finally, provide ways to get up and running without using a lot of configuration for prototyping as quickly as possible with as little overhead as possible.

Front end configuration 10 years ago

Front end development consisted of <html>, .css, and .js. .css and .js files were added via <script> or <link> tags individually.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "">
    <link href="main.css" />
    <link href="ie.css" />
    <link href="print.css" />
    <div>Everything was a div</div>
    <script src="jquery.js"></script>
    <script src="main.js"></script>

That was it. HTML, CSS, and JavaScript APIs had a lot less to them. The difficulty was that APIs were more minimal and browser quirks were more critical.

Front end configuration now

Front-end development is a lot different today. Code itself if much easier to digest. HTML, CSS, and JavaScript APIs are more mature. Browser quirks are much less mission critical.

Despite the greatly improved simplicity in the main front end APIs, the directory structure of a front-end repository is much more complex.

  -  dist/
  -  src/
     -  components/
     -  layouts/
     -  pages/
     -  styles/
     -  templates/
  -  test/
     -  acceptance/
     -  unit/
     -  .babelrc
     -  .eslint.js
  -  .babelrc
  -  .circleci
  -  .editorconfig
  -  .eslintignore
  -  .eslint.js
  -  .nvmrc
  -  manifest.json
  -  package.json
  -  package-lock.json
  -  some-config.js
  -  maybe-even-another-config.js
  -  rollup.config.js
  -  yarn.lock

Code itself is less complex and very modular. The steps to publish that code the browser if fair more complex.

Front end configuration notes

Specific configuration for production-ready products is in important. However, when prototyping, configuration should be fast and easy so developers can focus on the tool they are trying to prototype for. When developers prototype, the tool that is focused on first is usually the view layer. The developer will decide to build a React App and use create-react-app or a similar create-app generator for Vue or something similar. App generator products are great for speed, seeing how a Framework’s eco system can work, and getting an understanding of how a Framework’s view layer works. However, when developers must stray away from the exact app generator, it can be difficult and a ton of involved rewriting. To avoid this, developers can install JavaScript tooling minimally as will be demonstrated below.

Quick Configuration
The illustration above presents a loose visual reference of what `create apps tools` will configure and how that can seem to developers
Configuration Prototype
The illustration above visually points out what can/will start to happen when developers must stay from `create app tools`

Simple configuration for prototyping

To gain a general understanding of a framework, its tooling, and configuration, create app tools are awesome. To truly understand a framework, its configuration, and tooling, building a prototype without using a create app tool can be very beneficial.

Configuration Prototype
Setting up simple configuration for prototyping can help to understand all parts of a Framework's eco system

The steps below are high level, focusing only on configuration.

Note: The following steps can be done with a text editor or differently with varying shells. This post is about configuration, so the focus is doing this with as few of tools as possible. Therefore, the post will document the how-tos with Nano.


Linting communicates how a prototype’s JavaScript should be written. For this tool, it is recommended to install the defaults that are standard with the view layer.

If a React App is being prototyped

npm i eslint eslint-plugin-react --save-dev

Define linting configuration

echo '{ "plugins": [ "react" ] }' > .eslintrc

Setup JavaScript linting

A corresponding script can be added to the prototype’s package.json file

nano package.json

Within scripts {object}

"lint": "node_modules/eslint/bin/eslint.js . ./src/*.js"

Note: this command assumed there is an src/ directory and doesn’t assume other directories might need linting. Change the script above accordingly to suit your needs.


Babel can sometimes do all of the bundling. This post will go into how to setup both simply.

Install Babel (global install)

npm i babel-cli babel-core babel-preset-es2015 -g

Set up Babel configuration

echo '{ "presets": [ "es2015" ] }' > .babelrc

Setup JavaScript transpilation with only Babel

A corresponding script can be added to the prototype’s package.json file

nano package.json

If bundling is needed, within scripts {object}. Move on to bundling.

"transpile": "babel js src -d tmp"

If bundling is not needed, within scripts {object}. Move on to testing.

"transpile": "babel js src -d dist"


With Rollup version 0.50.0, JavaScript projects can be bundled with no configuration file making setup very fast and thoughtless.

Install Rollup

npm i -g rollup

Setup Rollup bundling

nano package.json

Within the scripts {object}

"bundling": "npm run transpile && rollup ./tmp/*.js --o ./dist/*.js --f umd"


Testing is a important to defining a prototype’s value and discovery.

Install Jest.

npm i jest --save-dev && nano package.json

Create a test script

"test": "jest"

After making a npm test script, make a test.[a file].js file that matches a [a file].js to be tested.


Front end development has changed a lot in the last years. Cleaner code comes with more configuration. Magic configuration can be dangerous because developers may not have much of an understanding of the tooling. When prototyping, setting up simple configuration for a Framework without using a create app tool can lead to deeper understanding of a framework’s eco system.

I hope the information and steps above help. Feedback and ideas are appreciated!