.eslintrc.js

module.exports = {
  root: true,
  parser: '@typescript-eslint/parser',
  parserOptions: {
    tsconfigRootDir: __dirname,
    project: [
      './tsconfig.json',
    ],
  },
  plugins: ['@typescript-eslint', 'import', 'no-only-tests'],
  extends: [
    'plugin:@typescript-eslint/recommended',
    'plugin:prettier/recommended',
    'plugin:import/typescript',
  ],
  rules: {
    'spaced-comment': ['error'],
    'import/no-relative-parent-imports': 'error',
    '@typescript-eslint/no-floating-promises': 'warn',
    '@typescript-eslint/no-use-before-define': 'off',
    '@typescript-eslint/explicit-function-return-type': 'warn',
    '@typescript-eslint/no-namespace': 'warn',
    '@typescript-eslint/ban-ts-comment': 'warn',
    '@typescript-eslint/consistent-type-assertions': 'warn',
    '@typescript-eslint/ban-types': [
      'warn',
      {
        types: {
          '{}': false,
        },
        extendDefaults: true,
      },
    ],
    '@typescript-eslint/naming-convention': [
      'warn',
      {
        selector: 'default',
        format: ['camelCase'],
        leadingUnderscore: 'allow',
        trailingUnderscore: 'allow',
      },
      {
        selector: 'variable',
        format: ['camelCase', 'PascalCase'],
        leadingUnderscore: 'allow',
        trailingUnderscore: 'allow',
      },
      {
        selector: 'variable',
        modifiers: ['const'],
        format: ['camelCase', 'PascalCase', 'UPPER_CASE'],
        leadingUnderscore: 'allow',
        trailingUnderscore: 'allow',
      },
      {
        selector: 'property',
        modifiers: ['static', 'readonly'],
        format: ['UPPER_CASE'],
        leadingUnderscore: 'allow',
        trailingUnderscore: 'allow',
      },
      {
        selector: 'property',
        format: ['camelCase', 'PascalCase'],
        leadingUnderscore: 'allow',
        trailingUnderscore: 'allow',
      },
      {
        selector: 'typeLike',
        format: ['PascalCase'],
      },
    ],
    eqeqeq: ['warn'],
    'no-only-tests/no-only-tests': [
      'error',
      {
        block: [
          'describe',
          'it',
          'context',
          'test',
          'tape',
          'fixture',
          'serial',
        ],
        focus: ['only', 'focus'],
        fix: false,
      },
    ],
  },
};