.eslintrc.js

//  npm i -D eslint eslint-config-prettier eslint-plugin-prettier prettier
module.exports = {
    env: {
      browser: true,
      commonjs: true,
      es6: true
    },
    extends: ['eslint:recommended', 'prettier'],
    globals: {
      Atomics: 'readonly',
      SharedArrayBuffer: 'readonly'
    },
    parserOptions: {
      ecmaVersion: 2018
    },
    "plugins": [
      "prettier"
    ],
    rules: {
      'prettier/prettier': [
        // customizing prettier rules (unfortunately not many of them are customizable)
        'error',
        {
          singleQuote: true,
          trailingComma: 'all'
        }
      ],
      eqeqeq: ['error', 'always'] // adding some custom ESLint rules
    }
  }