.eslintrc.js

module.exports = {
  env: {
    es6: true,
    jquery: false,
    browser: true,
    amd: true,
    commonjs: true,
    node: true,
  },
  parserOptions: {
    ecmaVersion: 2019,
    sourceType: 'module'
  },
  globals: {
    alert: false,
    clearTimeout: false,
    clearInterval: false,
    document: false,
    exports: false,
    module: false,
    navigator: false,
    require: false,
    setInterval: false,
    setTimeout: false,
    window: false,
    XMLHttpRequest: false
  },
  plugins: ['svelte3'],
  overrides: [
    {
      files: ['**/*.svelte'],
      processor: 'svelte3/svelte3'
    }
  ],
  settings: {
    'svelte3/ignore-styles': () => true,
  },
  rules: {
    camelcase: ['error', { properties: 'always' }],
    'comma-spacing': ['error', { before: false, after: true }],
    'comma-style': ['error', 'last'],
    'comma-dangle': ['error', 'always-multiline'],
    'brace-style': ['error', '1tbs', { allowSingleLine: true }],
    indent: ['error', 2, { SwitchCase: 1 }],
    'valid-jsdoc': [
      'warn',
      {
        requireReturn: false,
        preferType: {
          Boolean: 'boolean',
          String: 'string',
          Number: 'number',
          object: 'Object',
          array: 'Array',
          function: 'Function',
          element: 'Element',
          any: '*'
        }
      }
    ],
    'block-scoped-var': 'warn',
    curly: 'error',
    eqeqeq: 'warn',
    quotes: ['error', 'single'],
    semi: 'error',
    'no-inline-comments': 'warn',
    'no-debugger': 'error',
    'no-console': 'warn',
    'no-empty': 'warn',
    'no-spaced-func': 'warn',
    'no-array-constructor': 'error',
    'no-undefined': 'warn',
    'no-undef': 'error',
    'no-alert': 'warn',
    'no-loop-func': 'error',
    'no-extra-semi': 'error',
    'no-multi-spaces': 'error',
    'no-new': 'error',
    'no-unused-expressions': ['error', { allowShortCircuit: true }],
    'no-unused-vars': 'warn',
    'no-use-before-define': ['error', { functions: false }],
    'object-curly-spacing': ['warn', 'always'],
    'space-before-blocks': 'error',
    'semi-spacing': ['error', { before: false, after: true }],
    'keyword-spacing': ['error', { before: true, after: true }],
    'no-new-object': 'error',
    'key-spacing': ['error', { beforeColon: false, afterColon: true }],
    'space-infix-ops': ['error'],
    'space-before-function-paren': ['error', { anonymous: 'always', named: 'never' }],
    'no-var': 'error',
    'no-const-assign': 'error',
    'object-shorthand': 'error',
    'arrow-parens': ['error', 'as-needed', { requireForBlockBody: true }],
    'no-duplicate-imports': 'error',
  }
};