node_misc.md

Miscellaneous Node Helpers

• Nan::MakeCallback()
• NAN_MODULE_INIT()
• Nan::Export()

Nan::MakeCallback()

Wrappers around node::MakeCallback() providing a consistent API across all supported versions of Node.

Use MakeCallback() rather than using v8::Function#Call() directly in order to properly process internal Node functionality including domains, async hooks, the microtask queue, and other debugging functionality.

Signatures:

v8::Local<v8::Value> Nan::MakeCallback(v8::Local<v8::Object> target,
                                       v8::Local<v8::Function> func,
                                       int argc,
                                       v8::Local<v8::Value>* argv);
v8::Local<v8::Value> Nan::MakeCallback(v8::Local<v8::Object> target,
                                       v8::Local<v8::String> symbol,
                                       int argc,
                                       v8::Local<v8::Value>* argv);
v8::Local<v8::Value> Nan::MakeCallback(v8::Local<v8::Object> target,
                                       const char* method,
                                       int argc,
                                       v8::Local<v8::Value>* argv);

NAN_MODULE_INIT()

Used to define the entry point function to a Node add-on. Creates a function with a given name that receives a target object representing the equivalent of the JavaScript exports object.

See example below.

Nan::Export()

A simple helper to register a v8::FunctionTemplate from a JavaScript-accessible method (see Methods) as a property on an object. Can be used in a way similar to assigning properties to module.exports in JavaScript.

Signature:

void Export(v8::Local<v8::Object> target, const char *name, Nan::FunctionCallback f)

Also available as the shortcut NAN_EXPORT macro.

Example:

NAN_METHOD(Foo) {
  ...
}

NAN_MODULE_INIT(Init) {
  NAN_EXPORT(target, Foo);
}