---
id: frontend
title: Frontend Development
sidebar_position: 0
sidebar_custom_props:
  icon: TbTerminal2
---

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## Useful commands

### Starting the app

```bash
 nx start twenty-front
 ```

### Regenerate graphql schema based on API graphql schema

```bash
nx graphql:generate twenty-front
```

### Lint

```bash
nx lint twenty-front
```

### Test

```bash
nx test twenty-front# run jest tests
nx storybook:dev twenty-front# run storybook
nx storybook:test twenty-front# run tests # (needs yarn storybook:dev to be running)
nx storybook:coverage twenty-front # (needs yarn storybook:dev to be running)
```

## Tech Stack

The project has a clean and simple stack, with minimal boilerplate code.

**App**

- [React](https://react.dev/)
- [Apollo](https://www.apollographql.com/docs/)
- [GraphQL Codegen](https://the-guild.dev/graphql/codegen)
- [Recoil](https://recoiljs.org/docs/introduction/core-concepts)
- [TypeScript](https://www.typescriptlang.org/)

**Testing**

- [Jest](https://jestjs.io/)
- [Storybook](https://storybook.js.org/)

**Tooling**

- [Yarn](https://yarnpkg.com/)
- [Craco](https://craco.js.org/docs/)
- [ESLint](https://eslint.org/)

## Architecture

### Routing

[React Router](https://reactrouter.com/) handles the routing. 

To avoid unnecessary [re-renders](/contributor/frontend/best-practices#managing-re-renders) all the routing logic is in a `useEffect` in `PageChangeEffect`.

### State Management

[Recoil](https://recoiljs.org/docs/introduction/core-concepts) handles state management.

See [best practices](/contributor/frontend/best-practices#state-management) for more information on state management.

## Testing

[Jest](https://jestjs.io/) serves as the tool for unit testing while [Storybook](https://storybook.js.org/) is for component testing.

Jest is mainly for testing utility functions, and not components themselves.

Storybook is for testing the behavior of isolated components, as well as displaying the design system.