.eslintrc.js

module.exports = {
  env: {
    browser: true,
    es6: true,
  },
  parser: '@typescript-eslint/parser',
  parserOptions: {
    tsconfigRootDir: __dirname,
    // project: ['./src/tsconfig.json'],
  },
  plugins: ['@typescript-eslint'],
  rules: {
    '@typescript-eslint/adjacent-overload-signatures': 'error',
    '@typescript-eslint/array-type': 'error',
    '@typescript-eslint/ban-types': 'error',
    '@typescript-eslint/consistent-type-assertions': 'error',
    '@typescript-eslint/consistent-type-definitions': 'off',
    '@typescript-eslint/explicit-member-accessibility': [
      'off',
      {
        accessibility: 'explicit',
      },
    ],
    '@typescript-eslint/indent': 'off',
    '@typescript-eslint/member-delimiter-style': [
      'off',
      'error',
      {
        multiline: {
          delimiter: 'none',
          requireLast: true,
        },
        singleline: {
          delimiter: 'semi',
          requireLast: false,
        },
      },
    ],
    // '@typescript-eslint/no-floating-promises': ['error'],
    '@typescript-eslint/no-empty-interface': 'error',
    '@typescript-eslint/no-explicit-any': 'off',
    '@typescript-eslint/no-misused-new': 'error',
    '@typescript-eslint/no-namespace': 'error',
    '@typescript-eslint/no-non-null-assertion': 'warn',
    '@typescript-eslint/no-parameter-properties': 'off',
    '@typescript-eslint/no-use-before-declare': 'off',
    // [TODO] this does not check unused expressions completely...
    '@typescript-eslint/no-unused-expressions': 'error',
    '@typescript-eslint/no-var-requires': 'off',
    '@typescript-eslint/prefer-for-of': 'error',
    // "@typescript-eslint/prefer-function-type": "error",
    '@typescript-eslint/prefer-namespace-keyword': 'error',
    '@typescript-eslint/quotes': 'off',
    '@typescript-eslint/semi': ['off', null],
    '@typescript-eslint/space-within-parens': ['off', 'never'],
    // '@typescript-eslint/triple-slash-reference': [
    //   'error',
    //   {
    //     types: 'prefer-import'
    //   }
    // ],
    '@typescript-eslint/type-annotation-spacing': 'off',
    '@typescript-eslint/unified-signatures': 'error',
    '@typescript-eslint/explicit-function-return-type': [
      'error',
      {
        allowExpressions: true,
        allowTypedFunctionExpressions: true,
      },
    ],
    '@typescript-eslint/typedef': [
      'error',
      {
        arrowParameter: false,
        memberVariableDeclaration: true,
        parameter: true,
        propertyDeclaration: true,
      },
    ],
    'arrow-body-style': 'error',
    'arrow-parens': ['off', 'as-needed'],
    camelcase: 'off',
    'capitalized-comments': 'off',
    complexity: 'off',
    'constructor-super': 'error',
    curly: 'error',
    'dot-notation': 'off',
    'eol-last': 'off',
    eqeqeq: ['error', 'smart'],
    'guard-for-in': 'error',
    'id-blacklist': 'off',
    'id-match': 'off',
    'linebreak-style': 'off',
    'max-classes-per-file': 'off',
    'max-len': [
      'error',
      {
        ignorePattern: '// |/*',
        code: 100,
      },
    ],
    'new-parens': 'off',
    'newline-per-chained-call': 'off',
    'no-bitwise': 'off',
    'no-caller': 'error',
    'no-cond-assign': 'error',
    'no-console': 'off',
    'no-debugger': 'error',
    'no-empty': 'off',
    'no-eval': 'error',
    'no-extra-semi': 'off',
    'no-fallthrough': 'off',
    'no-invalid-this': 'off',
    'no-irregular-whitespace': 'off',
    'no-multiple-empty-lines': 'off',
    'no-new-wrappers': 'error',
    'no-shadow': 'off',
    '@typescript-eslint/no-shadow': ['error'],
    'no-throw-literal': 'error',
    'no-trailing-spaces': 'off',
    'no-undef-init': 'error',
    'no-underscore-dangle': 'off',
    'no-unsafe-finally': 'error',
    'no-unused-expressions': 'off',
    'no-unused-labels': 'error',
    'no-var': 'error',
    'object-shorthand': 'off',
    'one-var': ['error', 'never'],
    quotes: ['error', 'single'],
    'prefer-arrow/prefer-arrow-functions': 'off',
    'prefer-const': 'error',
    'quote-props': 'off',
    radix: 'error',
    'space-before-function-paren': 'off',
    'spaced-comment': ['error', 'always', { markers: ['/'] }],
    'use-isnan': 'error',
    'valid-typeof': 'off',
  },
};