.eslintrc.js

module.exports = {
    env: {
      browser: true,
      es6: true,
      node: true
    },
    extends: 'eslint:recommended',
    parserOptions: {
      ecmaVersion: 2020,
      sourceType: 'module'
    },
    plugins: ['import'],
    rules: {
      'array-callback-return': ['error'],
      camelcase: ['warn'],
      eqeqeq: ['error'],
      'func-style': ['error', 'declaration', { allowArrowFunctions: true }],
      'import/named': ['error'],
      'import/newline-after-import': ['warn'],
      'import/no-unresolved': ['error'],
      'linebreak-style': ['warn', 'unix'],
      'max-classes-per-file': ['error', 1],
      'no-alert': ['error'],
      'no-console': ['error'],
      'no-const-assign': ['error'],
      'no-debugger': ['error'],
      'no-duplicate-imports': ['error'],
      'no-else-return': ['error'],
      'no-extra-bind': ['error'],
      'no-invalid-this': ['error'],
      'no-multiple-empty-lines': ['warn'],
      'no-multi-spaces': [
        'warn',
        { exceptions: { VariableDeclarator: true, ImportDeclaration: true } }
      ],
      'no-restricted-globals': ['error', 'fdescribe', 'fit'],
      'no-shadow': ['error'],
      'no-trailing-spaces': ['warn'],
      'no-undef': ['error'],
      'no-unreachable': ['error'],
      'no-unused-vars': [
        'error',
        { argsIgnorePattern: '^_', ignoreRestSiblings: true, args: 'after-used' }
      ],
      'no-var': ['error'],
      'object-shorthand': ['warn'],
      'prefer-const': ['error'],
      'prefer-rest-params': ['error'],
      'prefer-spread': ['warn'],
      'prefer-template': ['warn']
    }
  };