.eslintrc.js

module.exports = {
  extends: [
    'plugin:@typescript-eslint/recommended', // Uses the recommended rules from the @typescript-eslint/eslint-plugin
    'prettier/@typescript-eslint', // Uses eslint-config-prettier to disable ESLint rules from @typescript-eslint/eslint-plugin that would conflict with prettier
    'plugin:prettier/recommended', // Enables eslint-plugin-prettier and displays prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.
  ],
  env: {
    node: true,
    jest: true,
  },
  plugins: [],
  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 }],
    '@typescript-eslint/no-use-before-define': [
      'error',
      { functions: false, classes: true, variables: true, typedefs: true },
    ],
    // If we can delete it - we should delete it: https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/no-unused-vars.md
    '@typescript-eslint/no-unused-vars': 'error',
    //Too restrictive: https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/explicit-function-return-type.md
    '@typescript-eslint/explicit-function-return-type': 'off',
    // https://github.com/typescript-eslint/typescript-eslint/issues/420
    'no-useless-constructor': 'off',
    '@typescript-eslint/no-useless-constructor': 'error',
    // We use any and warnings are becoming distracting
    '@typescript-eslint/no-explicit-any': 'off',
    // We use underscore dangle, especially in tests
    'no-underscore-dangle': 'off',
  },
};