[英]How do I create an ES6 class in V8 (for a Node.js native add-on)?
I'm writing a Node.js native add-on (with nan
helper module). 我正在编写一个Node.js本机加载项(带有
nan
helper模块)。 I want to create and export an ES6 class value, whose type is "function"
and .toString()
is "class ... { ... }"
. 我想创建和导出 ES6类值,其类型为
"function"
而.toString()
为"class ... { ... }"
。 Viz., I want to know the native equivalent of: 即,我想知道本机等效项:
module.exports = class CLASS_NAME {};
. 。
The only thing I could find on the V8 documentation for doing this, was .SetName()
. 我在V8文档中唯一可以找到的是
.SetName()
。
#include <nan.h>
#define LOCAL_STRING(c_string) (Nan::New(c_string).ToLocalChecked())
#define LOCAL_FUNCTION(c_function) \
(Nan::New<v8::FunctionTemplate>(c_function)->GetFunction())
void method(const Nan::FunctionCallbackInfo<v8::Value>& info)
{
info.GetReturnValue().Set(LOCAL_STRING("world"));
}
void initialize_module(
v8::Local<v8::Object> exports,
v8::Local<v8::Object> module
)
{
v8::Local<v8::Function> f = LOCAL_FUNCTION(method);
f->SetName(LOCAL_STRING("FUNCTION_NAME")); // The only thing I could do
module->Set(
LOCAL_STRING("exports"),
f
); // module.exports = f;
}
NODE_MODULE(blahblah, initialize_module)
But it only alters the name of a function: 但这只会更改函数的名称:
module.exports = function FUNCTION_NAME { ...... };
, which does not create an ES6 class at all. ,它根本不会创建ES6类。
How do I do this? 我该怎么做呢?
I think you need to name the function template by calling its SetClassName(v8::String)
method. 我认为您需要通过调用其
SetClassName(v8::String)
方法来命名函数模板。
If your function template is a constructor, it is also a good idea to name its prototype object template by setting symbol getToStringTag
like: 如果您的函数模板是构造函数,则通过设置符号
getToStringTag
来命名其原型对象模板也是一个好主意,例如:
prototype_template->Set(
v8::Symbol::GetToStringTag(isolate),
v8::String::New(isolate, "prototype_name"),
static_cast<v8::PropertyAttribute>(...);
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