How to use the ref-napi.alignof function in ref-napi

* The "ffi_type" is set for node-ffi functions.
 */

Function.prototype.ffi_type = bindings.FFI_TYPES.pointer;

/**
 * The "size" is always pointer-sized.
 */

Function.prototype.size = ref.sizeof.pointer;

/**
 * The "alignment" is always pointer-aligned.
 */

Function.prototype.alignment = ref.alignof.pointer;

/**
 * The "indirection" is always 1 to ensure that our get()/set() get called.
 */

Function.prototype.indirection = 1;

/**
 * Returns a ffi.Callback pointer (Buffer) of this function type for the
 * given `fn` Function.
 */

Function.prototype.toPointer = function toPointer (fn) {
  return Callback(this.retType, this.argTypes, this.abi, fn);
};