Write native modules like you write C

c_ish.cc

#include <nan.h>

using namespace v8;

typedef struct {
  int result;
  int prev;
} fibo_t;


NAN_METHOD(Init) {
  fibo_t *self = (fibo_t *) node::Buffer::Data(info[0]->ToObject());
  self->result = 1;
  self->prev = 0;
}

NAN_METHOD(Next) {
  fibo_t *self = (fibo_t *) node::Buffer::Data(info[0]->ToObject());
  int result = self->result;
  self->result = result + self->prev;
  self->prev = result;
  info.GetReturnValue().Set(Nan::New(result));
}

NAN_MODULE_INIT(InitAll) {
  Nan::Set(target, Nan::New<String>("SIZEOF_FIBO").ToLocalChecked(), Nan::New<Number>(sizeof(fibo_t)));
  Nan::Set(target, Nan::New<String>("init").ToLocalChecked(), Nan::GetFunction(Nan::New<FunctionTemplate>(Init)).ToLocalChecked());
  Nan::Set(target, Nan::New<String>("next").ToLocalChecked(), Nan::GetFunction(Nan::New<FunctionTemplate>(Next)).ToLocalChecked());
}

NODE_MODULE(c_ish, InitAll)

example.js

var fibo = require('./')

var struct = Buffer.allocUnsafe(fibo.SIZEOF_FIBO)

fibo.init(struct)

for (var i = 0; i < 10; i++) {
  console.log(fibo.next(struct))
}

index.js

var binding = require('node-gyp-build')(__dirname)

module.exports = binding

package.json

{
  "name": "c-ish",
  "version": "0.0.0",
  "description": "WIP - nothing to see here",
  "main": "index.js",
  "dependencies": {
    "nan": "^2.8.0",
    "node-gyp-build": "^3.2.2"
  },
  "devDependencies": {},
  "repository": {
    "type": "git",
    "url": "https://github.com/mafintosh/c-ish.git"
  },
  "author": "Mathias Buus (@mafintosh)",
  "license": "MIT",
  "bugs": {
    "url": "https://github.com/mafintosh/c-ish/issues"
  },
  "homepage": "https://github.com/mafintosh/c-ish"
}