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#include <node_api.h>

static bool exceptionWasPending = false;

void returnException(napi_env env, napi_callback_info info) {
  napi_status status;
  napi_value jsFunction;

  status = napi_get_cb_args(env, info, &jsFunction, 1);
  if (status != napi_ok) return;

  napi_value global;
  status = napi_get_global(env, &global);
  if (status != napi_ok) return;

  napi_value result;
  status = napi_call_function(env, global, jsFunction, 0, 0, &result);
  if (status ==  napi_pending_exception) {
    napi_value ex;
    status = napi_get_and_clear_last_exception(env, &ex);
    if (status != napi_ok) return;

    status = napi_set_return_value(env, info, ex);
    if (status != napi_ok) return;
  }
}

void allowException(napi_env env, napi_callback_info info) {
  napi_status status;
  napi_value jsFunction;

  status = napi_get_cb_args(env, info, &jsFunction, 1);
  if (status != napi_ok) return;

  napi_value global;
  status = napi_get_global(env, &global);
  if (status != napi_ok) return;

  napi_value result;
  status = napi_call_function(env, global, jsFunction, 0, 0, &result);
  // Ignore status and check napi_is_exception_pending() instead.

  status = napi_is_exception_pending(env, &exceptionWasPending);
  if (status != napi_ok) return;
}

void wasPending(napi_env env, napi_callback_info info) {
  napi_status status;

  napi_value result;
  status = napi_get_boolean(env, exceptionWasPending, &result);
  if (status != napi_ok) return;

  status = napi_set_return_value(env, info, result);
  if (status != napi_ok) return;
}

#define DECLARE_NAPI_METHOD(name, func)                          \
  { name, func, 0, 0, 0, napi_default, 0 }

void Init(napi_env env, napi_value exports, napi_value module, void* priv) {
  napi_status status;

  napi_property_descriptor descriptors[] = {
      DECLARE_NAPI_METHOD("returnException", returnException),
      DECLARE_NAPI_METHOD("allowException", allowException),
      DECLARE_NAPI_METHOD("wasPending", wasPending),
  };

  status = napi_define_properties(
    env, exports, sizeof(descriptors) / sizeof(*descriptors), descriptors);
  if (status != napi_ok) return;
}

NAPI_MODULE(addon, Init)