.eslintrc.js

module.exports = {
  env: {
    browser: true,
    node: true,
    es2021: true,
  },
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/eslint-recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:vue/recommended',
  ],
  parserOptions: {
    parser: '@typescript-eslint/parser',
    project: './tsconfig.json',
    extraFileExtensions: ['.vue'],
  },
  plugins: ['vue'],
  rules: {
    'max-len': [
      'error',
      {
        code: 100,
        // Fixes errors in HTML files with long links
        ignoreUrls: true,
      },
    ],

    // Disable stylistic rules that interfere with Prettier
    'vue/html-closing-bracket-newline': 'off',
    'vue/html-self-closing': 'off',
    'vue/max-attributes-per-line': 'off',
    'vue/singleline-html-element-content-newline': 'off',
    'vue/html-indent': 'off',

    'vue/multi-word-component-names': ['off'],
    // This rule is for Vue3, and Gridsome uses Vue2
    'vue/no-deprecated-filter': ['off'],
    // Don't make <g-link> multiline, it adds spaces
    'vue/multiline-html-element-content-newline': [
      'error',
      {
        ignores: [
          'g-link',
          // Original inline elements from: https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/utils/inline-non-void-elements.json
          'a',
          'abbr',
          'audio',
          'b',
          'bdi',
          'bdo',
          'canvas',
          'cite',
          'code',
          'data',
          'del',
          'dfn',
          'em',
          'i',
          'iframe',
          'ins',
          'kbd',
          'label',
          'map',
          'mark',
          'noscript',
          'object',
          'output',
          'picture',
          'q',
          'ruby',
          's',
          'samp',
          'small',
          'span',
          'strong',
          'sub',
          'sup',
          'svg',
          'time',
          'u',
          'var',
          'video',
        ],
      },
    ],

    '@typescript-eslint/indent': ['error', 2],
    semi: ['error', 'always'],
    'arrow-parens': ['error', 'always'],
    'comma-dangle': ['error', 'always-multiline'],

    '@typescript-eslint/explicit-function-return-type': [
      'error',
      {
        allowExpressions: true,
        allowHigherOrderFunctions: true,
        allowTypedFunctionExpressions: true,
      },
    ],
  },
  overrides: [
    {
      files: ['*.vue', 'declarations/*.ts'],
      rules: {
        indent: 'off',
        '@typescript-eslint/indent': 'off',
        '@typescript-eslint/no-var-requires': 0,
      },
    },
  ],
};