gistfile1.txt

#include <capnp/test.capnp.h>

// ...

using ::capnproto_test::capnp::test::TestInterface

class TestCapabilityHandler: public JsonCodec::Handler<TestInterface> {
public:
  void encode(const JsonCodec& codec, TestInterface::Client input,
                      JsonValue::Builder output) const override {
    KJ_UNIMPLEMENTED("TestCapabilityHandler::encode");
  }

  TestInterface::Client decode(const JsonCodec& codec, JsonValue::Reader input) const override {
    return nullptr;
  }
};

KJ_TEST("register capability handler") {
  TestCapabilityHandler handler;
  JsonCodec json;
  json.addTypeHandler(handler);
}