.eslintrc.json

{
  "root": true,
  "parser": "@typescript-eslint/parser", // Specifies the ESLint parser
  "plugins": ["@typescript-eslint", "prettier", "jest", "import"],
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended", // Uses the recommended rules from @typescript-eslint/eslint-plugin
    // "plugin:@typescript-eslint/recommended-type-checked", // Uncomment for very strict validation rules
    "plugin:prettier/recommended", // Enables eslint-plugin-prettier and eslint-config-prettier. This will display prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.
    "plugin:jest/recommended",
    "plugin:jest/style",
    "prettier"
  ],
  "env": {
    "browser": true,
    "node": true,
    "jest": true,
    "es6": true
  },
  "parserOptions": {
    "ecmaVersion": 2018, // Allows for the parsing of modern ECMAScript features
    "project": "./tsconfig.json",
    "sourceType": "module"
  },
  "rules": {
    "prettier/prettier": "error",
    "@typescript-eslint/ban-ts-comment": "error",
    "@typescript-eslint/no-use-before-define": "off",
    "@typescript-eslint/array-type": ["error", { "default": "array" }],
    "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": "^_" }
    ], // Allow unused vars when prefixed with underscore
    "jest/no-commented-out-tests": "warn",
    "spaced-comment": ["error", "always"],
    "@typescript-eslint/no-explicit-any": "warn",
    "no-console": "warn",
    "@typescript-eslint/explicit-module-boundary-types": "warn",
    "@typescript-eslint/explicit-function-return-type": "off",
    "@typescript-eslint/consistent-type-definitions": ["error", "interface"],
    // "@typescript-eslint/no-floating-promises": ["warn", { "ignoreVoid": true }],
    "require-await": "warn",
    "curly": ["warn", "all"],
    "eqeqeq": ["error", "allow-null"],
    "import/no-cycle": "off" // TODO: Enabling this slows down VSCode ESLint plugin - https://github.com/microsoft/vscode-eslint/issues/1431
  },
  "overrides": [
    {
      // Unit tests
      "files": ["*.{spec,test}.{ts}", "**/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"
      }
    }
  ],
  "settings": {
    "import/parsers": {
      "@typescript-eslint/parser": [".ts"]
    },
    "import/resolver": {
      "typescript": {
        "alwaysTryTypes": true, // always try to resolve types under `<root>@types` directory even it doesn't contain any source code, like `@types/unist`
        "project": ["libs/*/tsconfig.json", "services/*/**/tsconfig.json"]
      }
    }
  }
}