Eslint Config Sprylab

This is an eslint config used at Sprylab GmbH for typescript, react and react-native based projects.

Installation

yarn add --dev @sprylab/eslint-config

npm i --save-dev @sprylab/eslint-config

Also make sure to have prettier and of course typescript and eslint installed as well. Then add the following config to your extend array in your eslint config file.

module.exports = {
    extends: [
        '@sprylab/eslint-config', // this is the base
        /* 
            for react: '@sprylab/eslint-config/react'
            for native: '@sprylab/eslint-config/native'
        */
    ],
    parserOptions: {
        project: './tsconfig.json', // should be the path to the projects tsconfig.json
    },
}

IMPORTANT:

For this config to work you need to have a tsconfig.json file at the repo root level, and then you have to set the parserOptions.project to point to your tsconfig file. see the @typescript-eslint plugin docs.
You also need to have babel installed and a babel config file at the repo root level see the @babel eslint parser docs
for best experience you should have a prettier config file at the repo root as well, otherwise the eslint-config-prettier will use its builtin defaults.
if you use path aliases, (e.g. use "@" as a path alias to /src etc.), you will probably need to setup a path resolver for the eslint-plugin-import package or turn off some of its rules. There is a resolver for node, typescript, babel, webpack etc.

Configuration

This package includes three distinct configs:

base

@typescript, @babel, es2021 globals and testing-library.

extends: [
    '@sprylab/eslint-config',
],

react

base config, browser globals, react, react-hooks and testing-library/react.

extends: [
    '@sprylab/eslint-config/react',
]

native

native -> react config + react native

extends: [
    '@sprylab/eslint-config/native',
]

Plugins included

This config includes and configures the following eslint plugins / parsers:

Parsers

For javascript files (*.js(x)):

@babel/eslint-parser
@babel/eslint-plugin

For typescript files only (*.ts(x)):

@typescript-eslint/eslint-plugin
@typescript-eslint/parser

Plugins

Base

plugins shared by all configs / overrides

eslint-config-prettier
eslint-plugin-prettier
eslint-plugin-import
eslint-plugin-sonarjs
eslint-plugin-sort-imports-es6-autofix

Testing

plugins shared across all configs for test files (example.spec.ts) etc.)

eslint-plugin-testing-library
eslint-plugin-jest

Non-Testing

eslint-plugin-unicorn

React and React Native

eslint-plugin-react
eslint-plugin-react-hooks

React (exclusive)

plugin:jsx-a11y/recommended

React Native (exclusive)

eslint-plugin-react-native

Recommendations

add a pre-commit eslint check using husky and lint-staged to your package.json file, for example:

"husky": {
    "hooks": {
        "pre-commit": "lint-staged"
    }
},
"lint-staged": {
    "*.{md,json,yml,yaml}": [
        "prettier --write"
    ],
    "*.{jsx,jsx,ts,tsx}": [
        "eslint --fix"
    ]
}

add package.json eslint scripts:

"scripts": {
    "check:script": "eslint --fix-dry-run './{src,__tests__}/**/*.{js,ts,tsx}'",
    "lint:script": "eslint --fix './{src,__tests__}/**/*.{js,ts,tsx}'",
}

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