• Description
• Prerequisites
• Installation
• Usage
• Building & Deployment
• Publish to the Chrome Web Store
• Project Structure
• Commands
• Tools

This repo contains base code for the eco.mio hiring challenge. What you are looking at is a stub version of a browser extension. Learn about how to get started below. But first, here is the task:

Build a browser extension that augments the user experience for a travellers performing an air or rail search on https://skyscanner.com and https://kayak.com. This extension should do the following:

• Read out the user's destination from the site
• Provide the user in an intuitive way with dummy sustainability information of their trip
  • The data can be anything, e.g. a sustainability score of the destination
  • The data must be fetched from a DB through a backend app (ideally written in Django)
• Save each search to the database (origin, time of search, data displayed to the user)

Bonus points will be awarded for:

• Great UI
• Tooltip on the element with some more (dummy) information

Solve the task as if you were working on it in a professional environment.

You will find a class DOMElement.ts in the src directory. Give feedback about it as if you were doing a code review. Use comments in the code for this. You may also alter it and use it for your own implementation.

if you have any questions, contact Mario at [email protected]. Once you are done with the task notify Mario via email ([email protected]) and include the link to your repository.

1. Installed Chrome or Edge Browser
2. NodeJS from https://nodejs.org/en/download/ (for npm)

1. Create your own repository from the template and clone into it

2. Install the node modules: npm install

3. Build the extension in hot-reloading mode with npm run watch

4. Install the Quick Extension Reload Extension for easy reloading in development :https://chrome.google.com/webstore/detail/quick-extension-reload/goeiakeofnlpkioeadcbocfifmgkidpb.

5. Enable extension in the browser:

   1. Type chrome://extensions into the search bar on Chrome (edge://extensions for Edge).
   2. Enable "Developer mode" with top right switch (bottom left on Edge).
   3. Click "Load unpacked" and select the extension-challenge/dist/ folder.

1. To continuosly rebuild after code and file changes were saved we execute the following npm script: npm run watch

2. Before testing/debugging in the browser we need to refresh the extension in our browser: Press "Alt" + "R" when in the browser. (Requires the Quick Extension Reload Extension, see "Installation".)

Note: To apply changes in the code to the extension one could also manually do so by hitting the refresh arrow of the extension at chrome://extensions/.

The overall project is structured as follows:

  extension-challenge
  ├── dist*
  ├── public
  ├── src
  └── webpack

*not checked in

• dist:
  • the build files (once created)
• public:
  • all static files for the extension in general, like css and images
• src:
  • contains all the source code
• webpack:
  • webpack configuration files for development

The src folder of the project is structured as follows:

src
├── assets
├── tests
├── types
|
└── main.ts

The subfolders serve the following purpose:

• assets:
  • folder containing the project's style files, fonts and images
• tests:
  • tests (including end-to-end tests) for the project. Initially empty
• types:
  • custom types and interfaces.

And the file:

• main.ts:
  • where the magic happens. Main script that runs each time an allowed page is (re)loaded. Technically speaking a contentscript.

This is a list of useful commands for the project and a short explanation of what these commands do, when executed in the root folder of the project:

• npm install installs the necessary dependencies
• npm run install:clean deletes and reinstalls all dependencies
• npm run watch continuosly rebuild after code changes
• npm run test runs all tests of the project

This is a list of tools, used in the project

• Node.js: runtime environment for JavaScript
• npm: package manager for node projects
• TypeScript: statically typed programming language, transpiled to JavaScript
• ESLint: linter for JavaScript and TypeScript projects
• Prettier: code formatter
• Webpack: module bundler for JavaScript projects
• Jest: testing library for JavaScript projects