.eslintrc.json

{
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/eslint-recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:deprecation/recommended",
    "plugin:import/recommended",
    "plugin:import/typescript",
    "plugin:json/recommended",
    "plugin:lit-a11y/recommended",
    "plugin:require-extensions/recommended",
    "plugin:prettier/recommended"
  ],
  "overrides": [
    {
      "extends": ["plugin:@typescript-eslint/disable-type-checked"],
      "files": ["./**/*.json", "./.*.json"],
      "parserOptions": {
        "extraFileExtensions": [".json"],
        "project": "./tsconfig.lint.json",
        "tsconfigRootDir": "."
      }
    }
  ],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 2021,
    "extraFileExtensions": [".json"],
    "project": "./tsconfig.lint.json",
    "sourceType": "module",
    "tsconfigRootDir": "."
  },
  "plugins": [
    "@typescript-eslint",
    "eslint-plugin-lit",
    "eslint-plugin-tsdoc",
    "require-extensions",
    "simple-import-sort",
    "unused-imports",
    "file-extension-in-import-ts",
    "import",
    "json",
    "lit-a11y"
  ],
  "root": true,
  "rules": {
    "file-extension-in-import-ts/file-extension-in-import-ts": "error",
    "import/no-unresolved": ["error", { "ignore": ["\\.js$", "\\.svg$"] }],
    "json/*": "error",
    "no-unused-vars": "off",
    "simple-import-sort/exports": "error",
    "simple-import-sort/imports": [
      "error",
      {
        "groups": [
          ["^\\u0000"],
          ["^node:"],
          ["^@?\\w"],
          ["^"],
          ["^\\."],
          ["^.+\\.s?(png|jpg|jpeg|svg)$"],
          ["^.+\\.s?(css|scss)$"],
          ["^.+\\.s?json$"]
        ]
      }
    ],
    "tsdoc/syntax": "warn",
    "unused-imports/no-unused-imports": "error",
    "unused-imports/no-unused-vars": [
      "warn",
      {
        "args": "after-used",
        "argsIgnorePattern": "^_",
        "vars": "all",
        "varsIgnorePattern": "^_"
      }
    ]
  }
}