Node.js class addon

#[macro_use]
extern crate napi_derive;
use std::convert::TryInto;
use napi::{CallContext, JsNumber, JsObject, JsUndefined, JsString, Property, Result};

#[js_function(1)]
fn class_constructor(ctx: CallContext) -> Result<JsUndefined> {
  // Define class constructor
}
#[js_function(1)]
fn process_data_class(ctx: CallContext) -> Result<JsObject> {
	// Define class methods
}
#[module_exports]
pub fn init(mut exports: JsObject) -> Result<()> {
  exports.create_named_method($1, process_data_class)?;
  Ok(())
}