.eslintrc

{
  "extends": ["airbnb-base", "plugin:@typescript-eslint/recommended", "plugin:import/typescript"],
  "plugins": ["@typescript-eslint", "prettier", "import"],
  "parser": "@typescript-eslint/parser",
  "settings": {
    "import/parsers": {
      "@typescript-eslint/parser": [".ts"]
    },
    "import/resolver": {
      "typescript": { }
    }
  },
  "env": {
    "node": "true",
    "browser": "true"
  },
  "rules": {
    # Necessary in order to have ability to use paths in tsconfig. It will work only for aliases which start w/ "@"
    # "import/no-unresolved": "off",
    "import/no-unresolved": [2,  { "ignore": ["^@.*"] }],

    # Extra rule for us< as we have devs working on different os
    "linebreak-style": ["error", "unix"],

    # Allow import from files without extensions ('./SomeService' instead of './SomeService.ts')
    "import/extensions": [ "error", "ignorePackages", { "ts": "never", "js": "never" }],

    # Bad practice to use default export
    "import/prefer-default-export": "off",

    # Function return (void). Disable early returns, deeper nesting is necessary.
    "consistent-return": "off",

    # JS convention for naming private vars. Example: _db
    "no-underscore-dangle": "off",

    # If there is no this. call in method -> make it static.
    "class-methods-use-this": "off",

    # For objects with more than 3 params.
    "object-curly-newline": "off",

    # This is fine.
    "lines-between-class-members": "off",

    # Irrelevant
    "no-plusplus": "off",

    # Allow ForOfStatement
    "no-restricted-syntax": [ "error", "ForInStatement", "LabeledStatement", "WithStatement" ],

    # Allow continue as we decided to allow ForOfStatement
    "no-continue": "off",

    # Specifically to node
    "no-console": "off",

    # They are fine sometimes.
    # "no-nested-ternary": "off",

    # Up max-len to 140
    "max-len": ["error", { "code": 140 }]
  },
  "overrides": [
    {
      "files": ["*.ts", "*.tsx"],
      "rules": {
        # To allow method overloading
        "no-dupe-class-members": "off",

        # TS indentation
        "@typescript-eslint/indent": [2, 2],

        # Allow empty private constructor in order to implement Singleton pattern
        "no-useless-constructor": "off",
        "@typescript-eslint/no-useless-constructor": "off",
        "@typescript-eslint/no-empty-function": ["error", { "allow": ["constructors"] }],

        # Ensure interfaces name start with "I"
        # Was removed from `typescript-eslint`
        # "@typescript-eslint/interface-name-prefix": ["error", { "prefixWithI": "always" }],
        "@typescript-eslint/naming-convention": [
          "error",
          {
            "selector": "interface",
            "format": ["PascalCase"],
            "custom": {
              "regex": "^I[A-Z]",
              "match": true
            }
          }
        ],

        # Ensure use of T[] for simple array annotations and Array<T> for complicated
        "@typescript-eslint/array-type": ["error", {
          "default" : "array-simple",
          "readonly": "array-simple"
        }],

        # Ordering for class members. Just defaults
        # "@typescript-eslint/member-ordering": ["error", { default: ["signature", "field", "constructor", "method"] }]
        "@typescript-eslint/member-ordering": ["error"],

        # Disable eslint rule and apply enhanced ts-eslint rule
        "no-shadow": "off",
        "@typescript-eslint/no-shadow": "error",

        # Disable eslint rule and apply enhanced ts-es-eslint rule
        "no-use-before-define": "off",
        "@typescript-eslint/no-use-before-define": ["error"],

        #
        "@typescript-eslint/explicit-module-boundary-types": ["error", { "allowArgumentsExplicitlyTypedAsAny": true }],

        # Allow imports from devDependencies for tests
        "import/no-extraneous-dependencies": ["error", { "devDependencies": ["**/*.spec.ts", "**/*.spec.tsx"] }],
      }
    }
  ]
}