我正在尝试为 lance-gg 的 Renderer 子类编写单元测试

// test/client.js
const lance = require('lance-gg');
console.log(lance);

{
  GameEngine: [Function: GameEngine],GameWorld: [Function: GameWorld],P2PhysicsEngine: [Function: P2PhysicsEngine],SimplePhysicsEngine: [Function: SimplePhysicsEngine],BaseTypes: [Function: BaseTypes] {
    TYPES: {
      FLOAT32: 'FLOAT32',INT32: 'INT32',INT16: 'INT16',INT8: 'INT8',UINT8: 'UINT8',STRING: 'STRING',CLASSINSTANCE: 'CLASSINSTANCE',LIST: 'LIST'
    }
  },TwoVector: [Function: TwoVector],DynamicObject: [Function: DynamicObject],PhysicalObject2D: [Function: PhysicalObject2D],PhysicalObject3D: [Function: PhysicalObject3D],ServerEngine: [Function: ServerEngine],Lib: { Trace: [Function: Trace] }
}

./node_modules/.bin/mocha --require @babel/register ./test/client.js

然而，lance.Renderer 解析为 undefined，这让我怀疑 lance 是从服务器导出而不是此处定义的客户端导出构建的：https://github.com/lance-gg/lance/blob/911b60bdb5b887aa281e7c968506028797616132/rollup.config.js

以下是一个现有测试的示例，它似乎将客户端代码正确编译到测试中：https://github.com/lance-gg/lance/blob/master/test/EndToEnd/multiplayer.js

我的问题是，require('lance-gg') 如何知道是导入客户端还是服务器端

如何让测试从客户端导出编译？