.eslintrc.js

module.exports = {
  env: {
    browser: true,
    commonjs: true,
    es2020: true,
    node: true,
  },
  parser: '@babel/eslint-parser',
  extends: ['eslint:recommended', 'standard', 'prettier'],
  parserOptions: {
    ecmaVersion: 11,
    requireConfigFile: 'false',
    babelOptions: { configFile: './.babelrc' },
    sourceType: 'module',
  },
  ignorePatterns: ['tmp/*'],
  rules: {
    'import/no-extraneous-dependencies': ['error', { packageDir: '.' }],
  },
  overrides: [
    {
      files: ['**/tests/**/*.js'],
      env: {
        jest: true,
      },
    },
    {
      files: ['**/*.tsx', '**/*.ts'],
      plugins: ['@typescript-eslint', 'jsx-a11y'],
      extends: ['plugin:jsx-a11y/recommended'],
      parser: '@typescript-eslint/parser',
      rules: {
        camelcase: 'off',
        'no-unused-vars': 'off',
        'no-undef': 'off',
        'no-use-before-define': 'off',
        '@typescript-eslint/no-unused-vars': ['error'],
        'jsx-a11y/no-onchange': 'off',
      },
    },
  ],
}