@stdlib/assert-napi-is-type NPM

Assert Type

Assert that a Node-API value is a specified Node-API data type.

Installation

npm install @stdlib/assert-napi-is-type

Usage

var headerDir = require( '@stdlib/assert-napi-is-type' );

headerDir

Absolute file path for the directory containing header files for C APIs.

var dir = headerDir;
// returns <string>

Examples

var headerDir = require( '@stdlib/assert-napi-is-type' );

console.log( headerDir );
// => <string>

C APIs

Usage

#include "stdlib/assert/napi/is_type.h"

stdlib_assert_napi_value_is_type( env, value, type, message, err )

Asserts that a Node-API value is a specified Node-API data type.

#include "stdlib/assert/napi/is_type.h"
#include <node_api.h>

static napi_value addon( napi_env env, napi_callback_info info ) {
    napi_value value;

    // ...

    napi_value err;
    napi_status status = stdlib_assert_napi_value_is_type( env, value, napi_number, "Must be a number.", &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.
type: [in] napi_valuetype Node-API data type.
message: [in] char* error message.
err: [out] napi_value* pointer for storing a JavaScript error.

napi_status stdlib_assert_napi_value_is_type( const napi_env env, const napi_value value, const napi_valuetype type, 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 provided a value whose type differs from type, the function sets err with a JavaScript error; otherwise, err is set to NULL.

Notice

This package is part of 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, see the main project repository.