.eslintrc

{
    // `root: true` prevent eslint to combine .eslintrc in parent folder with this one
    // ext developer can remove this line if desire to let eslint to traverses eslint config 
    // see <http://eslint.org/docs/user-guide/configuring#configuration-cascading-and-hierarchy>
    "root": true,
    // require to install @typescript-eslint/parser + typescript
    "parser": "@typescript-eslint/parser",
    // Tells ESLint to load the plugin. this allows you to use 
    // the rules within your codebase
    "plugins": [
        "@typescript-eslint"
    ],
    "extends": [
        // ESLint's inbuilt "recommended" config
        "eslint:recommended",
        // require to install @typescript-eslint/eslint-plugin
        // just like eslint:recommended, except it only turns on rules from TypeScript-specific plugin
        "plugin:@typescript-eslint/recommended"
    ],
    "env": {
        // this tells eslint it's safe to use `require`/`module.exports`/`__dirname`...
        // that are only legal in node.js, we use these in `webpack.config.js`
        "node": true,
        "jest": true
    },
    "rules": {
        "indent": ["error", 2],
        "linebreak-style": ["error","unix"],
        "quotes": ["error", "double"]
    }
}