.eslintrc.js

module.exports = {
  "env": {
    "browser": true,
    "es2021": true,
    "node": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:react/recommended",
    "plugin:@typescript-eslint/recommended"
  ],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaFeatures": {
      "jsx": true
    },
    "ecmaVersion": "latest",
    "sourceType": "module"
  },
  "plugins": [
    "react",
    "@typescript-eslint"
  ],
  "rules": {
    // If you are reading this your are probably wondering why we got so many warnings
    // To put it simple, we used TSLint, and when we moved to ESLint we did not want to to auto fix all the errors
    // so now these are warning and we fix them only when we touch the files with warning
    "no-unexpected-multiline": "warn",
    "prefer-const": "warn",
    "no-async-promise-executor": "warn",
    "no-var": "warn",
    "no-useless-escape": "warn",
    "no-empty": "warn",
    "no-empty-pattern": "warn",
    "no-prototype-builtins": "warn",
    "no-mixed-spaces-and-tabs": "warn",

    "no-extra-boolean-cast": "off",

    // We can turn this off since we do it only once
    "no-global-assign": "warn",

    // I'd like this one as an error again once solved
    "prefer-rest-params": "warn",
    // I'd like this one as an error again once solved
    "no-ex-assign": "warn",
    // I'd like this one as an error again once solved
    "no-irregular-whitespace": "warn",
    // I'd like this one as an error again once solved
    "no-constant-condition": "warn",

    // I'm not sure about this one, maybe we should just disable this rule entirelly
    "prefer-spread": "warn",

    "@typescript-eslint/prefer-as-const": "warn",
    "@typescript-eslint/no-extra-semi": "warn",    
    "@typescript-eslint/no-var-requires": "warn",
    "@typescript-eslint/no-this-alias": "warn",
    "@typescript-eslint/no-empty-function": "warn",

    // I'd like this one as an error again once solved
    "@typescript-eslint/ban-ts-comment": "warn",
    "react/prop-types": "warn",
    "react/display-name": "warn",
    "react/jsx-no-comment-textnodes": "warn",
    "react/no-direct-mutation-state": "warn",

    // One of the few rules I'm quite happy to just disable entirelly -> https://github.com/jsx-eslint/eslint-plugin-react/blob/master/docs/rules/no-unescaped-entities.md
    "react/no-unescaped-entities": "warn",

    // This needs to be turned back into an error after we remove all the remaning instances of it
    "react/no-find-dom-node": "warn",

    // This needs to be turned back into an error after we remove all the remaning instances of it
    "react/jsx-key": "warn",

    // Note: Check https://typescript-eslint.io/rules/ban-types/#extenddefaults
    // This can be handy to mark deprecated types
    "@typescript-eslint/ban-types": "warn",

    // You can use types instead of interface for this cases eg:
    // NO! : interface IAttribute extends IXmlNode<{ id: string, type: string, value: string }> {}
    // YES!: type IAttribute = IXmlNode<{ id: string, type: string, value: string }>;
    "@typescript-eslint/no-empty-interface": "warn",

    // !!! Vortex specific rules mentioned in the Vortex code standards and style guides !!!
    
    // Massimo and Sebastian agreed on turning this off
    "@typescript-eslint/no-inferrable-types": "off",
    "@typescript-eslint/no-explicit-any": "off",

    "@typescript-eslint/naming-convention": [
      "warn",
      {
        "selector": "interface",
        "format": ["PascalCase"],
        "custom": {
          "regex": "^I[A-Z]",
          "match": true
        }
      }
    ],
    "no-restricted-imports": [
      "warn",
      {
        "name": "bluebird",
        "message": "Please avoid using Bluebird. Use ES6 promises instead"
      }
    ],
    "max-lines-per-function": [
      "warn",
      {
        "max": 25,
        "skipComments": true,
        "skipBlankLines": true
      }
    ],
    "max-len": [
      "warn",
      {
        "code": 100,
        "comments": 150,
        "ignoreUrls": true,
        "ignoreStrings": true,
        "ignoreRegExpLiterals": true,
        "ignoreTrailingComments": true,
      }
    ],
    "indent": [
      "warn",
      2,
      {
        "FunctionDeclaration": { "parameters": "first" },
        "FunctionExpression": { "parameters": "first" },
        "CallExpression": { "arguments": "first" },
        "SwitchCase": 1,
        "ImportDeclaration": "first",
        "flatTernaryExpressions": true,
        "offsetTernaryExpressions": false,
        "ignoreComments": true,
      }
    ],
  },
  "overrides": [
    {
      "files": ["*.tsx"],
      "rules": {
        "max-lines-per-function": [
          "warn",
          {
            "max": 100,
            "skipComments": true,
            "skipBlankLines": true
          }
        ],
      }
    }
  ]
}