.eslintrc.json

{
  "extends": [
    "eslint:recommended",
    "prettier",
    "plugin:eslint-comments/recommended",
    "plugin:promise/recommended",
    "plugin:jest/recommended",
    "plugin:import/errors",
    "plugin:import/typescript",
    "plugin:@typescript-eslint/recommended"
  ],
  "plugins": ["prettier", "promise", "jest"],
  "parser": "@babel/eslint-parser",
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module",
    "requireConfigFile": false
  },
  "env": {
    "es2020": true,
    "es6": true,
    "node": true,
    "jest": true,
    "browser": true
  },
  "rules": {
    "eslint-comments/no-unused-disable": "error",
    "jest/consistent-test-it": "error",
    "jest/expect-expect": "error",
    "jest/prefer-spy-on": "error",
    "jest/prefer-to-contain": "error",
    "jest/prefer-to-have-length": "error",
    "array-callback-return": "error",
    "camelcase": "error",
    "default-case": "error",
    "dot-notation": "error",
    "eqeqeq": ["error", "always", { "null": "ignore" }],
    "global-require": "error",
    "handle-callback-err": "error",
    "no-array-constructor": "error",
    "no-buffer-constructor": "error",
    "no-duplicate-imports": "error",
    "no-else-return": "error",
    "no-empty-function": "error",
    "no-eval": "error",
    "no-extra-bind": "error",
    "no-floating-decimal": "error",
    "no-implicit-coercion": "error",
    "no-implied-eval": "error",
    "no-labels": "error",
    "no-lone-blocks": "error",
    "no-lonely-if": "error",
    "no-multi-assign": "error",
    "no-multi-str": "error",
    "no-nested-ternary": "error",
    "no-new-func": "error",
    "no-new-object": "error",
    "no-new-require": "error",
    "no-new-wrappers": "error",
    "no-new": "error",
    "no-param-reassign": ["error", { "props": true }],
    "no-path-concat": "error",
    "no-plusplus": ["error", { "allowForLoopAfterthoughts": true }],
    "no-proto": "error",
    "no-return-assign": "error",
    "no-return-await": "error",
    "no-self-compare": "error",
    "no-sequences": "error",
    "no-shadow-restricted-names": "error",
    "no-shadow": "error",
    "no-undef": ["error", { "typeof": true }],
    "no-undef-init": "error",
    "no-unmodified-loop-condition": "error",
    "no-unneeded-ternary": "error",
    "no-unused-expressions": "error",
    "no-useless-call": "error",
    "no-useless-catch": "error",
    "no-useless-computed-key": "error",
    "no-useless-concat": "error",
    "no-useless-rename": "error",
    "no-useless-return": "error",
    "no-var": "error",
    "no-void": "error",
    "no-with": "error",
    "object-shorthand": "error",
    "one-var": ["error", "never"],
    "prefer-arrow-callback": "error",
    "prefer-const": "error",
    "prefer-object-spread": "error",
    "prefer-promise-reject-errors": "error",
    "prefer-rest-params": "error",
    "prefer-spread": "error",
    "prefer-template": "error",
    "prettier/prettier": "error",
    "require-await": "error",
    "strict": 0,
    "yoda": ["error", "never"],
    "import/no-deprecated": "error", // Prevents the use of deprecated imports
    "import/no-dynamic-require": "error", // Prevents the use of dynamic expressions in CJS require
    "import/no-absolute-path": "error", // Requires that all imports be specified in relative terms
    "import/no-self-import": "error", // Prevents a module importing itself
    "import/no-useless-path-segments": "error", // Prevents redundant path sections in imports
    "import/no-unused-modules": "error", // Requires that all imports be used within the file somewhere.
    "import/first": "error", // Requires that all imports appear at the top of the file
    "import/no-duplicates": "error", // Prevents the same module being imported twice
    "import/newline-after-import": "error", // Enforces seperation between imports and module definition
    "import/extensions": "error", // Prevents the use of extensions when importing files
    "import/no-unresolved": ["error"],
    "import/named": "off",
    "import/order": ["error", { "newlines-between": "always" }]
  },
  "overrides": [
    {
      "files": ["**/*.ts", "**/*.tsx"],
      "parser": "@typescript-eslint/parser",
      "plugins": ["@typescript-eslint/eslint-plugin"],
      "rules": {
        "no-unused-vars": "off",
        "@typescript-eslint/no-unused-vars": "error",
        "no-shadow": "off",
        "@typescript-eslint/no-shadow": ["error"]
      }
    }
  ],
  "settings": {
    "import/resolver": {
      "typescript": {} // this loads <rootdir>/tsconfig.json to eslint
    }
  }
}