https://github.com/stdlib-js/assert-napi-has-property
Assert that a Node-API value has a specified property.
https://github.com/stdlib-js/assert-napi-has-property
addon assert assertion javascript napi native node node-js nodejs stdlib validate validation
Last synced: 4 months ago
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Assert that a Node-API value has a specified property.
- Host: GitHub
- URL: https://github.com/stdlib-js/assert-napi-has-property
- Owner: stdlib-js
- License: apache-2.0
- Created: 2024-04-17T05:50:47.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2025-08-05T19:47:58.000Z (5 months ago)
- Last Synced: 2025-08-05T21:32:14.355Z (5 months ago)
- Topics: addon, assert, assertion, javascript, napi, native, node, node-js, nodejs, stdlib, validate, validation
- Language: Python
- Homepage: https://github.com/stdlib-js/stdlib
- Size: 105 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Citation: CITATION.cff
- Security: SECURITY.md
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README
About stdlib...
We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.
The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.
When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.
To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
# Assert Property
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Assert that a Node-API value has a specified property.
## Installation
```bash
npm install @stdlib/assert-napi-has-property
```
## Usage
```javascript
var headerDir = require( '@stdlib/assert-napi-has-property' );
```
#### headerDir
Absolute file path for the directory containing header files for C APIs.
```javascript
var dir = headerDir;
// returns
```
## Examples
```javascript
var headerDir = require( '@stdlib/assert-napi-has-property' );
console.log( headerDir );
// =>
```
* * *
## C APIs
### Usage
```c
#include "stdlib/assert/napi/has_property.h"
```
#### stdlib_assert_napi_value_has_property( env, value, \*property, \*message, \*err )
Asserts that a Node-API value has a specified property.
```c
#include "stdlib/assert/napi/has_property.h"
#include
static napi_value addon( napi_env env, napi_callback_info info ) {
napi_value value;
// ...
napi_value err;
napi_status status = stdlib_assert_napi_value_has_property( env, value, "foo", "Missing property.", &err );
assert( status == napi_ok );
if ( err != NULL ) {
assert( napi_throw( env, err ) == napi_ok );
return NULL;
}
// ...
}
```
The function accepts the following arguments:
- **env**: `[in] napi_env` environment under which the function is invoked.
- **value**: `[in] napi_value` Node-API value.
- **property**: `[in] char*` property name.
- **message**: `[in] char*` error message.
- **err**: `[out] napi_value*` pointer for storing a JavaScript error.
```c
napi_status stdlib_assert_napi_value_has_property( const napi_env env, const napi_value value, const char *property, const char *message, napi_value *err );
```
The function returns a `napi_status` status code indicating success or failure (returns `napi_ok` if success).
### Notes
- If the value does not have the specified property, the function sets `err` with a JavaScript error; otherwise, `err` is set to `NULL`.
* * *
## Notice
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
#### Community
[![Chat][chat-image]][chat-url]
---
## License
See [LICENSE][stdlib-license].
## Copyright
Copyright © 2016-2025. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/assert-napi-has-property.svg
[npm-url]: https://npmjs.org/package/@stdlib/assert-napi-has-property
[test-image]: https://github.com/stdlib-js/assert-napi-has-property/actions/workflows/test.yml/badge.svg?branch=main
[test-url]: https://github.com/stdlib-js/assert-napi-has-property/actions/workflows/test.yml?query=branch:main
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/assert-napi-has-property/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/assert-napi-has-property?branch=main
[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-napi-has-property/main/LICENSE