xo/test/fixtures/overrides/package.json

{
  "xo": {
    "space": 2,
    "semicolon": false,
    "overrides": [
      {
        "files": "test/*.js",
        "esnext": true,
        "space": 3
      },
      {
        "files": "test/foo.js",
        "space": 4
      }
    ],
    "rules": {
      "import/no-extraneous-dependencies": 0,
      "ava/no-ignored-test-files": 0
    }
  }
}