.eslintrc

{
  "env": {
    "browser": true,
    "es6": true,
    "amd": true,
    "node": true,
    "jest/globals": true
  },
  "ignorePatterns": ["*original*"],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module",
    "project": ["./tsconfig.json"]
  },
  "globals": {
    "gapi": false,
    "google": false
  },
  "plugins": ["react", "@typescript-eslint", "babel", "jest"],
  "extends": [ "eslint:recommended", "plugin:react/recommended" ],
  "settings": {
    "react": {
      "createClass": "createReactClass", // Regex for Component Factory to use,
                                         // default to "createReactClass"
      "pragma": "React",  // Pragma to use, default to "React"
      "version": "detect" // React version. "detect" automatically picks the version you have installed.
                          // You can also use `16.0`, `16.3`, etc, if you want to override the detected value.
                          // default to latest and warns if missing
                          // It will default to "detect" in the future
    }
  },
  "rules": {
    // possible errors
    // "no-console": "off",    // 19 console statements
    "no-extra-parens": "off",   // liberal use of extra parens
    "no-prototype-builtins": "warn",
    "no-unreachable": "error",
    "no-unsafe-negation": "error",

    // best practices
    "array-callback-return": "error",
    "block-scoped-var": "warn",
    "consistent-return": "off", // liberal use of inconsistent returns, e.g. SproutCore properties
    "dot-notation": ["off", { "allowKeywords": false }],
    "@typescript-eslint/dot-notation": ["warn", { "allowKeywords": false }],
    "eqeqeq": ["error", "allow-null"],
    "@typescript-eslint/member-delimiter-style": ["warn", {
      "multiline": { "delimiter": "none" },
      "singleline": { "delimiter": "comma" }
    }],
    "no-alert": "error",
    "no-caller": "error",
    "no-eval": "error",
    // "no-extra-bind": "off", // 18 extra binds
    "no-global-assign": "error",
    "no-invalid-this": "off",
    "babel/no-invalid-this": "error",
    "no-loop-func": "warn",
    "no-new-wrappers": "error",
    "no-proto": "error",
    "no-sequences": "error",
    "no-unmodified-loop-condition": "error",
    "no-unused-expressions": ["error", { "allowShortCircuit": true }],
    "no-useless-call": "error",
    "no-useless-concat": "warn",
    "no-useless-escape": "off", // 34 unnecessary escapes
    "no-useless-return": "error",
    "no-with": "error",
    "radix": "error",
    "wrap-iife": ["warn", "any"],

    // strict mode
    "strict": "off",

    // variables
    "no-shadow-restricted-names": "error",
    "no-unused-vars": ["off", { "vars": "all", "args": "none" }],
    "@typescript-eslint/no-unused-vars": ["warn", { "vars": "all", "args": "none", "ignoreRestSiblings": true }],
    "no-use-before-define": "off",  // 169 used before defined

    // node.js/CommonJS
    "no-mixed-requires": "warn",

    // stylistic issues
    "eol-last": "off",  // 13 files missing final EOLs
    "func-name-matching": "error",
    "new-cap": ["warn", { "capIsNew": false }],
    "new-parens": "warn",
    "no-bitwise": "warn",
    "no-lonely-if": "off",  // 8 lonely ifs
    "no-underscore-dangle": "off",  // liberal use of leading underscores
    "no-unneeded-ternary": "warn",
    "no-whitespace-before-property": "warn",
    "quote-props": ["error", "as-needed", { "keywords": true, "unnecessary": false }],
    "quotes": "off",
    "semi": "off",
    "@typescript-eslint/semi": ["warn", "never"],
    "react/display-name": "off",
    "react/prop-types": "off", // TODO: FIX THIS
    "react/no-find-dom-node": "off" // TODO: Fix this!!!
  },
  "overrides": [
    { // rules specific to Jest tests
      "files": ["src/**/*.test.*", "src/test/**"],
      "env": {
        "node": true,
        "jest": true
      },
      "globals": {
        "jestSpyConsole": "readonly"
      },
      "plugins": ["jest"],
      "extends": ["plugin:jest/recommended"],
      "rules": {
        "@typescript-eslint/no-non-null-assertion": "off",
        // require() can be useful in mocking
        "@typescript-eslint/no-require-imports": "off",
        "@typescript-eslint/no-var-requires": "off",
        "jest/no-disabled-tests": "off",
        "jest/no-done-callback": "off",
        "jest/no-focused-tests": "off"
      }
    }
  ]
}