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# Eslint Config Terra

This configuration reflects Terra's supported eslint policy for javascript.

Features:

- extends the  [eslint-config-airbnb](https://github.com/airbnb/javascript/tree/master/packages/eslint-config-airbnb), which exports ESLint rules, including rules for ECMAScript 6+ and React.
- checks for proper ReactJS Hooks usage via the [eslint-plugin-react-hooks](https://reactjs.org/docs/hooks-rules.html).
- checks syntax for targeted browsers support via the [eslint-plugin-compat](https://github.com/amilajack/eslint-plugin-compat). It is recommended to use Terra's targeted browsers which are specified by the [browserslist-config-terra](https://github.com/cerner/terra-toolkit/tree/main/packages/browserslist-config-terra) module.
- defines the browser and jest environment
- defines enzyme globals for `shallow`, `render` and `mount` for jest testing

## What is Eslint

[ESlint](https://eslint.org/) is a pluggable linting utility for JavaScript and JSX.

## Installation

Install the module

```shell
npm install eslint --save-dev
npm install @cerner/eslint-config-terra --save-dev
```

## Usage

Include the configuration defined by `@cerner/eslint-config-terra` via the  [extends](https://eslint.org/docs/user-guide/configuring#extending-configuration-files) property.

To lint based on supported browsers, add browserlist config as specified in the [browserlist config upgrade guide](dev_tools/cerner/browserslist-config-terra/upgrade-guide).

### package.json

```json
{
  "eslintConfig": {
    "extends": "@cerner/terra"
  },
}
```