.eslintrc.js

// eslint-disable-next-line @typescript-eslint/no-var-requires
const { defineConfig } = require('eslint-define-config');

module.exports = defineConfig({
  root: true,
  env: {
    browser: true,
    es2020: true,
    node: true,
  },
  extends: [
    'eslint:recommended',
    'plugin:import/recommended',
    'plugin:eslint-comments/recommended',
    'plugin:jsonc/recommended-with-jsonc',
    'plugin:markdown/recommended',
    'plugin:vue/vue3-recommended',
    'plugin:@typescript-eslint/recommended',
    'prettier',
  ],
  settings: {
    'import/resolver': {
      node: { extensions: ['.js', '.mjs', '.ts', '.d.ts', '.tsx'] },
    },
  },
  plugins: ['@typescript-eslint', 'prettier', 'unicorn'],
  parser: '@typescript-eslint/parser',
  parserOptions: {
    sourceType: 'module',
  },
  overrides: [
    {
      files: ['*.json', '*.json5', '*.jsonc'],
      parser: 'jsonc-eslint-parser',
    },
    {
      files: ['*.ts', '*.tsx', '*.vue'],
      rules: {
        // The core 'no-unused-vars' rules (in the eslint:recommeded ruleset)
        // does not work with type definitions
        'no-unused-vars': 'off',
        // TS already checks for that, and Typescript-Eslint recommends to disable it
        // https://typescript-eslint.io/linting/troubleshooting#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
        'no-undef': 'off',
        '@typescript-eslint/no-unused-vars': 'warn',
      },
    },
    {
      files: ['*.d.ts'],
      rules: {
        'import/no-duplicates': 'off',
      },
    },
    {
      files: ['*.vue'],
      parser: 'vue-eslint-parser',
      parserOptions: {
        parser: '@typescript-eslint/parser',
        extraFileExtensions: ['.vue'],
        ecmaVersion: 'latest',
        ecmaFeatures: {
          jsx: true,
        },
      },
      rules: {
        'no-undef': 'off',
      },
    },
    {
      files: ['**/*.md/*.js', '**/*.md/*.ts', '**/*.md/*.vue'],
      rules: {
        'no-console': 'off',
        'import/no-unresolved': 'off',
        '@typescript-eslint/no-unused-vars': 'off',
        'no-unused-vars': 'off',
        'no-alert': 'off',
        'no-debugger': 'off',
        'getter-return': 'off',
        '@typescript-eslint/no-var-requires': 'off',
        '@typescript-eslint/no-redeclare': 'off',
        '@typescript-eslint/no-this-alias': 'off',
        '@typescript-eslint/no-empty-function': 'off',
      },
    },
  ],
  rules: {
    camelcase: ['error', { properties: 'never' }],
    'no-console': ['warn', { allow: ['error'] }],
    'no-debugger': 'warn',
    'no-constant-condition': ['error', { checkLoops: false }],
    'no-restricted-syntax': ['error', 'LabeledStatement', 'WithStatement'],
    'no-return-await': 'error',
    'no-var': 'error',
    'no-empty': ['error', { allowEmptyCatch: true }],
    'prefer-const': [
      'warn',
      { destructuring: 'all', ignoreReadBeforeAssign: true },
    ],
    'prefer-arrow-callback': [
      'error',
      { allowNamedFunctions: false, allowUnboundThis: true },
    ],
    'object-shorthand': [
      'error',
      'always',
      { ignoreConstructors: false, avoidQuotes: true },
    ],
    'prefer-rest-params': 'error',
    'prefer-spread': 'error',
    'prefer-template': 'error',

    'no-redeclare': 'off',
    '@typescript-eslint/no-redeclare': 'error',

    // best-practice
    'array-callback-return': 'error',
    'block-scoped-var': 'error',
    'no-alert': 'warn',
    'no-case-declarations': 'error',
    'no-multi-str': 'error',
    'no-with': 'error',
    'no-void': 'error',

    'sort-imports': [
      'warn',
      {
        ignoreCase: false,
        ignoreDeclarationSort: true,
        ignoreMemberSort: false,
        memberSyntaxSortOrder: ['none', 'all', 'multiple', 'single'],
        allowSeparatedGroups: false,
      },
    ],

    // stylistic-issues
    'prefer-exponentiation-operator': 'error',

    // ts
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/no-explicit-any': 'off',
    '@typescript-eslint/no-non-null-assertion': 'off',
    '@typescript-eslint/no-non-null-asserted-optional-chain': 'off',
    '@typescript-eslint/consistent-type-imports': [
      'error',
      { disallowTypeAnnotations: false },
    ],
    '@typescript-eslint/ban-ts-comment': ['off', { 'ts-ignore': false }],

    // vue
    'vue/no-v-html': 'off',
    'vue/require-default-prop': 'off',
    'vue/require-explicit-emits': 'off',
    'vue/multi-word-component-names': 'off',
    'vue/prefer-import-from-vue': 'off',
    'vue/no-v-text-v-html-on-component': 'off',
    'vue/html-self-closing': [
      'error',
      {
        html: {
          void: 'always',
          normal: 'always',
          component: 'always',
        },
        svg: 'always',
        math: 'always',
      },
    ],

    // prettier
    'prettier/prettier': 'error',

    // import
    'import/first': 'error',
    'import/no-duplicates': 'error',
    'import/order': [
      'error',
      {
        groups: [
          'builtin',
          'external',
          'internal',
          'parent',
          'sibling',
          'index',
          'object',
          'type',
        ],

        pathGroups: [
          {
            pattern: 'vue',
            group: 'external',
            position: 'before',
          },
          {
            pattern: '@vue/**',
            group: 'external',
            position: 'before',
          },
          {
            pattern: '@syseven/**',
            group: 'internal',
          },
        ],
        pathGroupsExcludedImportTypes: ['type'],
      },
    ],
    'import/no-unresolved': 'off',
    'import/namespace': 'off',
    'import/default': 'off',
    'import/no-named-as-default': 'off',
    'import/no-named-as-default-member': 'off',
    'import/named': 'off',

    // eslint-plugin-eslint-comments
    'eslint-comments/disable-enable-pair': ['error', { allowWholeFile: true }],

    // unicorn
    'unicorn/custom-error-definition': 'error',
    'unicorn/error-message': 'error',
    'unicorn/escape-case': 'error',
    'unicorn/import-index': 'error',
    'unicorn/new-for-builtins': 'error',
    'unicorn/no-array-method-this-argument': 'error',
    'unicorn/no-array-push-push': 'error',
    'unicorn/no-console-spaces': 'error',
    'unicorn/no-hex-escape': 'error',
    'unicorn/no-instanceof-array': 'error',
    'unicorn/no-invalid-remove-event-listener': 'error',
    'unicorn/no-new-array': 'error',
    'unicorn/no-new-buffer': 'error',
    'unicorn/no-unsafe-regex': 'off',
    'unicorn/number-literal-case': 'error',
    'unicorn/prefer-array-find': 'error',
    'unicorn/prefer-array-flat-map': 'error',
    'unicorn/prefer-array-index-of': 'error',
    'unicorn/prefer-array-some': 'error',
    'unicorn/prefer-date-now': 'error',
    'unicorn/prefer-dom-node-dataset': 'error',
    'unicorn/prefer-includes': 'error',
    'unicorn/prefer-keyboard-event-key': 'error',
    'unicorn/prefer-math-trunc': 'error',
    'unicorn/prefer-modern-dom-apis': 'error',
    'unicorn/prefer-negative-index': 'error',
    'unicorn/prefer-number-properties': 'error',
    'unicorn/prefer-prototype-methods': 'error',
    'unicorn/prefer-reflect-apply': 'error',
    'unicorn/prefer-string-slice': 'error',
    'unicorn/prefer-string-starts-ends-with': 'error',
    'unicorn/prefer-string-trim-start-end': 'error',
    'unicorn/prefer-type-error': 'error',
    'unicorn/throw-new-error': 'error',

    // unicorn disabled
    'unicorn/prefer-query-selector': 'off',
    'unicorn/no-for-loop': 'off',
    'unicorn/prefer-optional-catch-binding': 'off',
  },
});