.eslintrc.json

{
  "root": true,
  "parser": "@typescript-eslint/parser",
  "plugins": [
    "prettier",
    "@typescript-eslint",
    "unused-imports",
    "simple-import-sort"
  ],
  "parserOptions": {
    "project": "tsconfig.json",
    "sourceType": "module"
  },
  "settings": {
    "import/resolver": {
      "typescript": {
        "alwaysTryTypes": true,
        "project": "."
      }
    }
  },
  "extends": [
    "eslint:recommended",
    "plugin:import/recommended",
    "plugin:import/typescript",
    "prettier",
    "plugin:prettier/recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:@typescript-eslint/recommended-requiring-type-checking",
    "plugin:json/recommended"
  ],
  "rules": {
    "no-restricted-syntax": [
      "error",
      {
        "selector": "TSEnumDeclaration[const=true]",
        "message": "const enums are not supported in isolated module mode"
      }
    ],
    "import/no-unresolved": [
      "error",
      {
        "ignore": [
          "^@glimmer/local-debug-flags$",
          "^@glimmer/env$",
          "^@glimmer/syntax$"
        ]
      }
    ],
    "import/no-cycle": [
      "warn"
    ],
    "import/no-duplicates": "off",
    "simple-import-sort/imports": "error",
    "simple-import-sort/exports": "error",
    "@typescript-eslint/consistent-type-imports": [
      "error",
      {
        "prefer": "type-imports"
      }
    ],
    "@typescript-eslint/consistent-type-exports": [
      "error",
      {
        "fixMixedExportsWithInlineTypeSpecifier": true
      }
    ],
    "@typescript-eslint/no-unused-vars": [
      "warn",
      {
        "vars": "all",
        "args": "after-used",
        "ignoreRestSiblings": false,
        "caughtErrors": "none",
        "argsIgnorePattern": "^_"
      }
    ],
    "unused-imports/no-unused-imports": "error",
    "unused-imports/no-unused-vars": [
      "warn",
      {
        "vars": "all",
        "varsIgnorePattern": "^_",
        "args": "after-used",
        "argsIgnorePattern": "^_"
      }
    ],
    "no-empty": "warn",
    "no-fallthrough": "off",
    "prefer-const": "off",
    "prefer-arrow-callback": "warn"
  }
}