@JsExport
@ExperimentalJsExport
public class Manager(
  private var proxyKey: String,
  private var countryAlpha2: String,
) {
  public companion object {
    public fun build(proxyKey: ProxyKey, countryAlpha2: String): Manager =
      Manager(proxyKey.name, countryAlpha2)
  }

  public fun currentAnswers(): List<ApiAnswer> {
    return someSerializer.convertResponseToApiAnswers(response)
  }
}

manager.d.ts

export namespace com.company.manager {
    class Manager {
        constructor(proxyKey: string, countryAlpha2: string);
        static get Companion(): {
            build(proxyKey: any/* com.company.manager.common.ProxyKey */, countryAlpha2: string): com.company.manager.Manager;
        };
        currentAnswers(): any/* kotlin.collections.List<any/* com.company.manager.data.ApiAnswer */> */;
    }
}

currentAnswers()

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