# create_uint64
> Convert an unsigned 64-bit integer to a Node-API value.
## Usage
```javascript
var headerDir = require( '@stdlib/napi/create-uint64' );
```
#### headerDir
Absolute file path for the directory containing header files for C APIs.
```javascript
var dir = headerDir;
// returns
```
## Examples
```javascript
var headerDir = require( '@stdlib/napi/create-uint64' );
console.log( headerDir );
// =>
```
* * *
## C APIs
### Usage
```c
#include "stdlib/napi/create_uint64.h"
```
#### stdlib_napi_create_uint64( env, value, \*out )
Converts an unsigned 64-bit integer to a Node-API value.
```c
#include "stdlib/napi/create_uint64.h"
#include
static napi_value addon( napi_env env, napi_callback_info info ) {
// ...
napi_value value;
napi_status status = stdlib_napi_create_uint64( env, 1, &value );
assert( status == napi_ok );
// ...
}
```
The function accepts the following arguments:
- **env**: `[in] napi_env` environment under which the function is invoked.
- **value**: `[in] uint64_t` unsigned 64-bit integer.
- **out**: `[out] napi_value*` destination for storing output value.
```c
napi_status stdlib_napi_create_uint64( const napi_env env, const uint64_t value, napi_value *out );
```
The function returns a `napi_status` status code indicating success or failure (returns `napi_ok` if success).
#### STDLIB_NAPI_CREATE_UINT64( env, expression, name )
Macro for converting an unsigned 64-bit integer to a Node-API value.
```c
#include "stdlib/napi/create_uint64.h"
#include "stdlib/napi/argv_uint64.h"
#include "stdlib/napi/argv.h"
#include
#include
static uint64_t fcn( const uint64_t v ) {
return v;
}
// ...
static napi_value addon( napi_env env, napi_callback_info info ) {
// Retrieve add-on callback arguments:
STDLIB_NAPI_ARGV( env, info, argv, argc, 1 );
// Convert the first argument to a C type:
STDLIB_NAPI_ARGV_UINT64( env, value, argv, 0 );
// ...
// Convert a value having a C type to a Node-API value:
STDLIB_NAPI_CREATE_UINT64( env, fcn( value ), out );
return out;
}
```
The macro expects the following arguments:
- **env**: environment under which the callback is invoked.
- **expression**: expression returning an unsigned 64-bit integer.
- **name**: output variable name.
- The generated JavaScript value is a `BigInt` (N-API Version 6+).