Vanilla JS + CSS programming problem

Requisites

node

Preparation

npm i

The code

This code is bundled by vite. We have TS support and vitest for unit tests.

In the src folder you will find:

src/factory.ts This is the factory that will produce a count function you will use later. It is left blank for you to implement.

Factory takes two numerical arguments. First is the starting point for the count function, the other one is the step, by how much should we increment the counter on each click.

src/factory.test.ts - This is the unit test for the factory. It is written and ready, your implementation needs to pass these tests.

src/style/main.css These are the styles for the excersise. Plain CSS, nothing fancy :).

index.html The main page

src/main.ts Main logic for the implementation of the requirements.

The requirements

Build a simple page that looks similar to the image at public/design.png.

When you click the big yellow button in the middle, counter function imported from factory.ts should be executed and the returned value populated in the middle of it.

When you change either the start_at or step controls, new instance from the factory should be taken with updated arguments.

All test are passing. To run them:

npm run test

To work on the code:

npm run dev

Extra credit

• Improve accessibility.
• Better test coverage.
• UI tests.
• Improve DX.
• Add linters and formatters.
• Have fun.