.eslintrc.json

{
  "parser": "@typescript-eslint/parser", // Specifies the ESLint parser
  "plugins": ["@typescript-eslint", "prettier", "jest"],
  "extends": [
    "eslint:recommended",
    "prettier"
  ],
  "parserOptions": {
    "ecmaVersion": 2018, // Allows for the parsing of modern ECMAScript features
    "sourceType": "module", // Allows for the use of imports
    "ecmaFeatures": {
      "jsx": true // Allows for the parsing of JSX
    }
    //"project": ["./tsconfig.eslint.json"]
  },
  "env": {
    "browser": true,
    "node": true,
    "jest": true,
    "es6": true
  },
  "rules": {
    "@typescript-eslint/ban-ts-comment": "error",
    "prettier/prettier": "warn",
    "@typescript-eslint/no-use-before-define": "off",
    "@typescript-eslint/array-type": ["error", { "default": "array" }],
    "@typescript-eslint/ban-types": [
      "error",
      {
        "types": {
          "Array": null
        }
      }
    ],
    "no-return-await": "warn",
    "no-trailing-spaces": [
      "error",
      {
        "ignoreComments": true
      }
    ],
    "no-fallthrough": "error",
    "jest/valid-expect": ["error", { "maxArgs": 2 }],
    "jest/require-top-level-describe": "error",
    "@typescript-eslint/no-unused-vars": [
      "warn",
      { "argsIgnorePattern": "^_", "ignoreRestSiblings": true }
    ], // Allow unused vars when prefixed with underscore

    "jest/no-commented-out-tests": "warn",
    "@typescript-eslint/no-explicit-any": "warn",
    "no-console": "warn",
    "@typescript-eslint/explicit-module-boundary-types": "warn",
    "@typescript-eslint/explicit-function-return-type": [
      "warn",
      {
        "allowExpressions": true
      }
    ],
    "@typescript-eslint/consistent-type-definitions": ["error", "interface"],
    "curly": ["warn", "all"],
    "eqeqeq": ["error", "allow-null"]
  },
  "overrides": [
    {
      // Unit tests
      "files": ["*.{spec,test}.{ts,tsx}", "**/tests/**"],
      "rules": {
        "no-console": "off",
        "@typescript-eslint/no-non-null-assertion": "off",
        "@typescript-eslint/no-explicit-any": "off",
        "@typescript-eslint/explicit-function-return-type": "off"
      }
    },
    {
      // Libraries
      "files": ["libs/**"],
      "rules": {
        "@typescript-eslint/explicit-module-boundary-types": "error"
      }
    },
    {
      "files": ["*.js"],
      "rules": {
        "@typescript-eslint/no-var-requires": "off",
        "@typescript-eslint/explicit-function-return-type": "off"
      }
    }
  ],
  "settings": {},
  "globals": {
    "NodeJS": true
  }
}