binding.gyp

{
  "targets": [ {
    "target_name": "hello",
    "sources": [ "hello.cc" ],
    "conditions": [
      [ "'<!(node -p \"require('node-api').isNodeApiBuiltin\")'=='false'", {
        "include_dirs+": ["<!(node -p \"require('node-api').include\")"],
        "conditions": [
          [ "OS=='win'", {
            "libraries+": [ "<(PRODUCT_DIR)/node-api.lib" ]
          } ]
        ]
      } ]
    ],
    "dependencies": [
      "<!(node -p \"require('node-api').gyp\")"
    ]
  } ]
}

hello.cc

#include <node_api.h>

napi_value some_function(napi_env env, napi_callback_info info) {
  napi_value return_value = 0;

  napi_create_number(env, 42, &return_value);
  return return_value;
}

void Init(napi_env env, napi_value exports, napi_value module, void *nothing) {
  napi_value the_function = 0;

  napi_create_function(env, "some_function", some_function, 0, &the_function);
  napi_set_named_property(env, module, "exports", the_function);
}

NAPI_MODULE(hello, Init)

package.json

{
  "name": "hello",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bindings": "^1.2.1",
	"node-api": "github:gabrielschulhof/node-api#backcompat2"
  }
}

Output on Windows (among others):

hello.obj : error LNK2001: unresolved external symbol __imp_napi_create_function [C:\Users\nix\h
ello\build\hello.vcxproj]
hello.obj : error LNK2001: unresolved external symbol __imp_napi_create_number [C:\Users\nix\hel
lo\build\hello.vcxproj]
hello.obj : error LNK2001: unresolved external symbol __imp_napi_module_register [C:\Users\nix\h
ello\build\hello.vcxproj]
hello.obj : error LNK2001: unresolved external symbol __imp_napi_set_named_property [C:\Users\ni
x\hello\build\hello.vcxproj]
C:\Users\nix\hello\build\Release\hello.node : fatal error LNK1120: 4 unresolved externals [C:\Us
ers\nix\hello\build\hello.vcxproj]