.eslintrc.js

module.exports = {
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: 'tsconfig.json',
    tsconfigRootDir: __dirname,
    sourceType: 'module',
  },
  plugins: ['@typescript-eslint/eslint-plugin'],
  extends: ['plugin:@typescript-eslint/recommended', 'plugin:prettier/recommended'],
  env: {
    es6: true,
    node: true,
    jest: true,
  },
  ignorePatterns: ['.eslintrc.js'],
  rules: {
    // https://github.com/typescript-eslint/typescript-eslint/blob/v3.2.0/packages/eslint-plugin/docs/rules/explicit-module-boundary-types.md
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/no-unused-vars': 'off',
    '@typescript-eslint/explicit-function-return-type': 'off',
    '@typescript-eslint/consistent-type-assertions': 'off',
    '@typescript-eslint/indent': 'off',
    '@typescript-eslint/interface-name-prefix': 'off',
    '@typescript-eslint/member-delimiter-style': [
      'off',
      'error',
      {
        multiline: {
          delimiter: 'none',
          requireLast: true,
        },
        singleline: {
          delimiter: 'semi',
          requireLast: false,
        },
      },
    ],
    'no-param-reassign': 'error',
    '@typescript-eslint/member-ordering': 'off',
    '@typescript-eslint/no-this-alias': 'error',
    '@typescript-eslint/quotes': 'off',
    '@typescript-eslint/semi': ['off', null],
    '@typescript-eslint/space-within-parens': ['off', 'never'],
    '@typescript-eslint/type-annotation-spacing': 'off',
    'arrow-parens': ['off', 'as-needed'],
    camelcase: ['error', { properties: 'never', ignoreImports: true }],
    curly: ['error', 'multi-line'],
    'eol-last': 'off',
    eqeqeq: ['error', 'smart'],
    'id-blacklist': 'error',
    'id-match': 'error',
    'linebreak-style': 'off',
    'new-parens': 'off',
    'newline-per-chained-call': 'off',
    'no-console': 'off',
    'no-duplicate-imports': 'error',
    'no-eval': 'error',
    'no-extra-semi': 'off',
    'no-irregular-whitespace': 'off',
    'no-multiple-empty-lines': 'off',
    'no-new-wrappers': 'error',
    'no-trailing-spaces': 'off',
    'no-underscore-dangle': 'error',
    'no-var': 'error',
    'object-shorthand': 'error',
    'one-var': ['error', 'never'],
    'prefer-const': 'error',
    'prefer-template': 'error',
    'quote-props': 'off',
    radix: 'error',
    'space-before-function-paren': 'off',
    'spaced-comment': 'warn',
    'arrow-body-style': ['warn', 'as-needed'],
  },
};