eslint-config-conventions
ESLint shareable config to enforce strict conventions and good code quality.
## 📜 About
**eslint-config-conventions** is a [ESLint](https://eslint.org) configuration to enforce strict conventions and good code quality, it is highly inspired from [eslint-config-standard-with-typescript](https://github.com/standard/eslint-config-standard-with-typescript) but it is **stricter** and with **no formatting rules**, **only code-quality rules**. It supports both **JavaScript** and **TypeScript**.
This configuration is mostly **for catching bugs** and **code-quality** so it is recommanded to use it with [Prettier](https://prettier.io/) for a consistent code style, it works with any `.prettierrc.json` configuration.
More information about **formatting rules** vs **code-quality rules** can be found on [Prettier vs. Linters](https://prettier.io/docs/en/comparison.html).
## ⚙️ Getting Started
### Prerequisites
- [Node.js](https://nodejs.org/) >= 16.0.0
### Installation
`npm@<7` does not automatically install `peerDependencies`, so if that's what you're using, install them manually.
Here is an example, but use it only for reference, because your decisions regarding version ranges and range specifiers may vary.
```sh
npm install --save-dev \
eslint@^8.9.0 \
eslint-plugin-import@^2.26.0 \
eslint-plugin-promise@^6.0.0 \
eslint-plugin-unicorn@^43.0.0 \
eslint-config-conventions@latest
```
Yes, this is a large number of packages. This is due to [a known limitation in ESLint](https://github.com/eslint/eslint/issues/3458).
This list of dependencies are:
- [ESLint](https://github.com/eslint/eslint)
- 3 [ESLint Plugins](https://eslint.org/docs/user-guide/configuring/plugins)
- [eslint-plugin-import](https://github.com/import-js/eslint-plugin-import)
- [eslint-plugin-promise](https://github.com/xjamundx/eslint-plugin-promise)
- [eslint-plugin-unicorn](https://github.com/sindresorhus/eslint-plugin-unicorn)
- This package: `eslint-config-conventions`
If you want to use **TypeScript**, you also need to install:
```sh
npm install --save-dev \
typescript@^4.8.2 \
@typescript-eslint/eslint-plugin@^5.36.1 \
@typescript-eslint/parser@^5.36.1
```
Dependencies are:
- [TypeScript](https://github.com/Microsoft/TypeScript)
- [@typescript-eslint/eslint-plugin](https://github.com/typescript-eslint/typescript-eslint); ESLint rules for TypeScript.
- [@typescript-eslint/parser](https://github.com/typescript-eslint/typescript-eslint); ESLint parser for TypeScript.
### Configuration with [Prettier](https://prettier.io/) (recommended)
You will need to install some dependencies in addition to those required:
```sh
npm install --save-dev prettier eslint-config-prettier eslint-plugin-prettier
# Create an empty config file to let editors and other tools know you are using Prettier
# You can personalize it with your own rules
echo {}> .prettierrc.json
```
#### `.eslintrc.json`
```json
{
"extends": ["conventions", "prettier"],
"plugins": ["prettier"],
"parserOptions": {
"project": "./tsconfig.json"
},
"rules": {
"prettier/prettier": "error"
}
}
```
**Note:** Please read some important instructions regarding the `project` option [here](https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/parser/README.md#configuration).
`"parserOptions.project"` is only required if you use **TypeScript**.
#### `package.json`
```jsonc
{
"scripts": {
"lint:typescript": "eslint \"**/*.{js,jsx,ts,tsx}\" --ignore-path \".gitignore\"",
"lint:prettier": "prettier \".\" --check --ignore-path \".gitignore\""
}
}
```
### Usage
```sh
npm run lint:typescript
# or to apply automatic fixes to code
npm run lint:typescript -- --fix
# Validate code formatting in all supported languages by Prettier
npm run lint:prettier
```
## 💡 Contributing
Anyone can help to improve the project, submit a Feature Request, a bug report or even correct a simple spelling mistake.
The steps to contribute can be found in the [CONTRIBUTING.md](./CONTRIBUTING.md) file.
## 📄 License
[MIT](./LICENSE)