babel-nyc-config.json

{
  "babel": {
    "env": {
      "test": {
        "plugins": [
          "istanbul"
        ]
      }
    },
    "presets": [
      [
        "@babel/preset-env",
        {
          "targets": {
            "node": "current"
          },
          "modules": "commonjs",
          "useBuiltIns": false,
          "debug": true
        }
      ]
    ],
    "sourceMaps": true,
    "retainLines": true,
    "plugins": [
      "@babel/plugin-proposal-object-rest-spread",
      "@babel/plugin-proposal-optional-chaining"
    ]
  },
  "nyc": {
    "extension": [
      ".js"
    ],
    "include": "src/**/*.js",
    "require": [
      "@babel/register"
    ],
    "reporter": [
      "lcov",
      "text-summary"
    ],
    "sourceMap": false,
    "instrument": false,
    "all": true
  }
}