.eslintrc.js

module.exports = {
  plugins: ["@typescript-eslint", "prettier"],
  extends: [
    "plugin:@typescript-eslint/recommended",
    "plugin:prettier/recommended",
    "prettier/@typescript-eslint",
  ],
  env: {
    node: true,
    browser: true,
    es6: 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",
    "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 },
    ],
  },
};