# napi-build-utils [](https://www.npmjs.com/package/napi-build-utils)  [](https://travis-ci.org/inspiredware/napi-build-utils) [](http://standardjs.com/) [](https://opensource.org/licenses/MIT) A set of utilities to assist developers of tools that build [N-API](https://nodejs.org/api/n-api.html#n_api_n_api) native add-ons. ## Background This module is targeted to developers creating tools that build N-API native add-ons. It implements a set of functions that aid in determining the N-API version supported by the currently running Node instance and the set of N-API versions against which the N-API native add-on is designed to be built. Other functions determine whether a particular N-API version can be built and can issue console warnings for unsupported N-API versions. Unlike the modules this code is designed to facilitate building, this module is written entirely in JavaScript. ## Quick start ```bash $ npm install napi-build-utils ``` The module exports a set of functions documented [here](./index.md). For example: ```javascript var napiBuildUtils = require('napi-build-utils'); var napiVersion = napiBuildUtils.getNapiVersion(); // N-API version supported by Node, or undefined. ``` ## Declaring supported N-API versions Native modules that are designed to work with [N-API](https://nodejs.org/api/n-api.html#n_api_n_api) must explicitly declare the N-API version(s) against which they are coded to build. This is accomplished by including a `binary.napi_versions` property in the module's `package.json` file. For example: ```json "binary": { "napi_versions": [2,3] } ``` In the absence of a need to compile against a specific N-API version, the value `3` is a good choice as this is the N-API version that was supported when N-API left experimental status. Modules that are built against a specific N-API version will continue to operate indefinitely, even as later versions of N-API are introduced. ## Support If you run into problems or limitations, please file an issue and we'll take a look. Pull requests are also welcome.