.eslintrc.json

{
  "root": true,
  "env": {
    "es6": true,
    "node": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:import/typescript",
    "plugin:@typescript-eslint/recommended",
    "plugin:@typescript-eslint/recommended-requiring-type-checking",
    "prettier"
  ],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "project": "tsconfig.json",
    "sourceType": "module"
  },
  "plugins": ["eslint-plugin-import", "header", "@typescript-eslint"],
  "rules": {
    "@typescript-eslint/consistent-type-assertions": "error",
    "@typescript-eslint/no-explicit-any": "error",
    "@typescript-eslint/no-non-null-assertion": "error",
    "@typescript-eslint/no-unnecessary-qualifier": "error",
    "@typescript-eslint/no-unused-expressions": "error",
    "curly": "error",
    "header/header": [
      "error",
      "block",
      [
        "*",
        " * @license",
        " * Copyright Google LLC All Rights Reserved.",
        " *",
        " * Use of this source code is governed by an MIT-style license that can be",
        " * found in the LICENSE file at https://angular.io/license",
        " "
      ],
      2
    ],
    "import/first": "error",
    "import/newline-after-import": "error",
    "import/no-absolute-path": "error",
    "import/no-duplicates": "error",
    "import/no-extraneous-dependencies": ["off", { "devDependencies": false }],
    "import/no-unassigned-import": ["error", { "allow": ["symbol-observable"] }],
    "import/order": [
      "error",
      {
        "alphabetize": { "order": "asc" },
        "groups": [["builtin", "external"], "parent", "sibling", "index"]
      }
    ],
    "max-len": [
      "error",
      {
        "code": 140,
        "ignoreUrls": true
      }
    ],
    "max-lines-per-function": ["error", { "max": 200 }],
    "no-caller": "error",
    "no-console": "error",
    "no-empty": ["error", { "allowEmptyCatch": true }],
    "no-eval": "error",
    "no-multiple-empty-lines": ["error"],
    "no-throw-literal": "error",
    "padding-line-between-statements": [
      "error",
      {
        "blankLine": "always",
        "prev": "*",
        "next": "return"
      }
    ],
    "sort-imports": ["error", { "ignoreDeclarationSort": true }],
    "spaced-comment": [
      "error",
      "always",
      {
        "markers": ["/"]
      }
    ],

    /* TODO: evaluate usage of these rules and fix issues as needed */
    "no-case-declarations": "off",
    "no-fallthrough": "off",
    "no-underscore-dangle": "off",
    "no-useless-escape": "off",
    "@typescript-eslint/await-thenable": "off",
    "@typescript-eslint/ban-types": "off",
    "@typescript-eslint/no-empty-function": "off",
    "@typescript-eslint/explicit-module-boundary-types": "off",
    "@typescript-eslint/no-implied-eval": "off",
    "@typescript-eslint/no-var-requires": "off",
    "@typescript-eslint/no-unnecessary-type-assertion": "off",
    "@typescript-eslint/no-unsafe-assignment": "off",
    "@typescript-eslint/no-unsafe-call": "off",
    "@typescript-eslint/no-unsafe-member-access": "off",
    "@typescript-eslint/no-unsafe-return": "off",
    "@typescript-eslint/no-unused-vars": "off",
    "@typescript-eslint/prefer-regexp-exec": "off",
    "@typescript-eslint/require-await": "off",
    "@typescript-eslint/restrict-plus-operands": "off",
    "@typescript-eslint/restrict-template-expressions": "off",
    "@typescript-eslint/unbound-method": "off"
  },
  "overrides": [
    {
      "files": ["!packages/**", "**/*_spec.ts"],
      "rules": {
        "import/no-extraneous-dependencies": ["error", { "devDependencies": true }],
        "max-lines-per-function": "off",
        "no-console": "off"
      }
    }
  ]
}