.eslintrc.js

module.exports = {
  root: true,
  env: {
    browser: true,
    commonjs: true,
    es6: true,
    es2016: true,
    es2017: true,
    es2018: true,
    es2019: true,
    es2020: true,
    es2021: true,
    jest: true,
    node: true,
  },
  extends: ['eslint:recommended', 'plugin:prettier/recommended'],
  plugins: ['prettier'],
  globals: {
    Atomics: 'readonly',
    SharedArrayBuffer: 'readonly',
    _: false,
  },
  parserOptions: {
    ecmaVersion: 12,
    sourceType: 'module',
  },
  rules: {
    'eol-last': ['error', 'always'],
    'prettier/prettier': 'error',
    'linebreak-style': ['error', 'unix'],
    'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'warn',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'warn',
    semi: ['error', 'always'],
  },
  overrides: [
    {
      files: ['**/__tests__/*.{j,t}s?(x)', '**/tests/unit/**/*.spec.{j,t}s?(x)'],
      env: {
        jest: true,
      },
    },
  ],
};