{
  ...
  "rules": {
    "@typescript-eslint/no-unnecessary-type-assertion": "error",
    ...
  },
  "parserOptions": {
    "sourceType": "module",
    "project": [
      "./packages/typescript-estree/tsconfig.json",
      "./packages/parser/tsconfig.json",
      "./packages/eslint-plugin-tslint/tsconfig.json"
    ],
    "ecmaFeatures": {
      "jsx": false
    }
  },
  ...
}