.eslintrc.js

module.exports = {
  plugins: ['@typescript-eslint', 'eslint-comments', 'jest'],
  extends: [
    'plugin:@typescript-eslint/recommended',
    'plugin:eslint-comments/recommended',
    'plugin:jest/recommended',
    'prettier',
    'prettier/@typescript-eslint',
  ],
  env: {
    node: true,
    browser: true,
    jest: true,
  },
  rules: {
    // Too restrictive, writing ugly code to defend against a very unlikely scenario: https://eslint.org/docs/rules/no-prototype-builtins
    'no-prototype-builtins': 'off',
    // https://basarat.gitbooks.io/typescript/docs/tips/defaultIsBad.html
    'import/prefer-default-export': 'off',
    // Use function hoisting to improve code readability
    'no-use-before-define': ['error', { functions: false, classes: true, variables: true }],
    // Makes no sense to allow type inferrence for expression parameters, but require typing the response
    '@typescript-eslint/explicit-function-return-type': [
      'error',
      { allowExpressions: true, allowTypedFunctionExpressions: true },
    ],
    '@typescript-eslint/no-use-before-define': [
      'error',
      { functions: false, classes: true, variables: true, typedefs: true },
    ],
    '@typescript-eslint/no-var-requires': 'off',
    '@typescript-eslint/no-unused-variable': 'off',
    '@typescript-eslint/no-unused-vars': 'off',
    '@typescript-eslint/no-empty-interface': 'off',
    '@typescript-eslint/explicit-function-return-type': 'off',
  },
}