Node-API performance

What is the problem this feature will solve?

Improve performance when creating large V8 objects which is critical since these must always be created on the main thread, blocking the event loop.

Currently, the overhead of each method is very significant - especially for the primitive operations such as simply setting a property.

As a very typical example of the current problem, you can consider these two methods for setting a property on an object:

napi_status napi_set_property(napi_env env,
                                          napi_value object,
                                          napi_value key,
                                          napi_value value);
napi_status napi_set_named_property(napi_env env,
                                          napi_value object,
                                          const char* utf8name,
                                          napi_value value);

Naively, one expects that using the first one will be faster when the key is already UTF-16. However calling this method requires to first call napi_create_string_utf16 and the combined overhead of the two calls offsets the single call of the second method when the key is not very long (which is usually the case).

What is the feature you are proposing to solve the problem?

Step 1: napi_set_named_property that takes UTF-16 (not needed, see below)

Step 2: Methods that can create in one call a whole array/object from a C data structure - especially ones for strings already encoded in UTF-16

What alternatives have you considered?

No response

从 Node-API 入口 napi_set_property、napi_set_named_property 和 napi_create_string_utf16 开始，然后研究大型 V8 对象和原始属性操作是在主线程上如何创建的。该 issue 没有指定文件或测试；要完成此项工作，需要为基于 C 数据批量创建数组/对象定义 API 范围，并提供证据证明所提议的操作能够降低创建开销。