feat: add H_H macro in math/base/napi/unary

lib/node_modules/@stdlib/math/base/napi/unary/README.md

@@ -547,6 +547,69 @@ The function accepts the following arguments:
 void stdlib_math_base_napi_f_i( napi_env env, napi_callback_info info, int32_t (*fcn)( float ) );
 ```
 
+#### STDLIB_MATH_BASE_NAPI_MODULE_H_H( fcn )
+
+Macro for registering a Node-API module exporting an interface for invoking a unary function accepting and returning half-precision floating-point numbers.
+
+```c
+#include "stdlib/number/float16/ctor.h"
+
+static stdlib_float16_t identity( const stdlib_float16_t x ) {
+    return x;
+}
+
+// ...
+
+// Register a Node-API module:
+STDLIB_MATH_BASE_NAPI_MODULE_H_H( identity );
+```
+
+The macro expects the following arguments:
+
+-   **fcn**: `stdlib_float16_t (*fcn)( stdlib_float16_t )` unary function.
+
+When used, this macro should be used **instead of** `NAPI_MODULE`. The macro includes `NAPI_MODULE`, thus ensuring Node-API module registration.
+
+#### stdlib_math_base_napi_h_h( env, info, fcn )
+
+Invokes a unary function accepting and returning half-precision floating-point numbers.
+
+```c
+#include "stdlib/number/float16/ctor.h"
+#include <node_api.h>
+
+// ...
+
+static stdlib_float16_t identity( const stdlib_float16_t x ) {
+    return x;
+}
+
+// ...
+
+/**
+* Receives JavaScript callback invocation data.
+*
+* @param env    environment under which the function is invoked
+* @param info   callback data
+* @return       Node-API value
+*/
+napi_value addon( napi_env env, napi_callback_info info ) {
+    return stdlib_math_base_napi_h_h( env, info, identity );
+}
+
+// ...
+```
+
+The function accepts the following arguments:
+
+-   **env**: `[in] napi_env` environment under which the function is invoked.
+-   **info**: `[in] napi_callback_info` callback data.
+-   **fcn**: `[in] stdlib_float16_t (*fcn)( stdlib_float16_t )` unary function.
+
+```c
+void stdlib_math_base_napi_h_h( napi_env env, napi_callback_info info, stdlib_float16_t (*fcn)( stdlib_float16_t ) );
+```
+
 #### STDLIB_MATH_BASE_NAPI_MODULE_I_D( fcn )
 
 Macro for registering a Node-API module exporting an interface for invoking a unary function accepting a signed 32-bit integer and returning a double-precision floating-point number.

lib/node_modules/@stdlib/math/base/napi/unary/include/stdlib/math/base/napi/unary.h

@@ -27,6 +27,7 @@
 #include "stdlib/math/base/napi/unary/d_f.h"
 #include "stdlib/math/base/napi/unary/f_f.h"
 #include "stdlib/math/base/napi/unary/f_i.h"
+#include "stdlib/math/base/napi/unary/h_h.h"
 #include "stdlib/math/base/napi/unary/i_d.h"
 #include "stdlib/math/base/napi/unary/i_f.h"
 #include "stdlib/math/base/napi/unary/i_i.h"

lib/node_modules/@stdlib/math/base/napi/unary/include/stdlib/math/base/napi/unary/h_h.h

@@ -0,0 +1,84 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#ifndef STDLIB_MATH_BASE_NAPI_UNARY_H_H_H
+#define STDLIB_MATH_BASE_NAPI_UNARY_H_H_H
+
+#include "stdlib/number/float16/ctor.h"
+#include <node_api.h>
+#include <assert.h>
+
+/**
+* Macro for registering a Node-API module exporting an interface invoking a unary function accepting and returning half-precision floating-point numbers.
+*
+* @param fcn   unary function
+*
+* @example
+* #include "stdlib/number/float16/ctor.h"
+*
+* static stdlib_float16_t identity( const stdlib_float16_t x ) {
+*     return x;
+* }
+*
+* // ...
+*
+* // Register a Node-API module:
+* STDLIB_MATH_BASE_NAPI_MODULE_H_H( identity );
+*/
+#define STDLIB_MATH_BASE_NAPI_MODULE_H_H( fcn )                                \
+	static napi_value stdlib_math_base_napi_h_h_wrapper(                       \
+		napi_env env,                                                          \
+		napi_callback_info info                                                \
+	) {                                                                        \
+		return stdlib_math_base_napi_h_h( env, info, fcn );                    \
+	};                                                                         \
+	static napi_value stdlib_math_base_napi_h_h_init(                          \
+		napi_env env,                                                          \
+		napi_value exports                                                     \
+	) {                                                                        \
+		napi_value f;                                                          \
+		napi_status status = napi_create_function(                             \
+			env,                                                               \
+			"exports",                                                         \
+			NAPI_AUTO_LENGTH,                                                  \
+			stdlib_math_base_napi_h_h_wrapper,                                 \
+			NULL,                                                              \
+			&f                                                                 \
+		);                                                                     \
+		assert( status == napi_ok );                                           \
+		return f;                                                              \
+	};                                                                         \
+	NAPI_MODULE( NODE_GYP_MODULE_NAME, stdlib_math_base_napi_h_h_init )
+
+/*
+* If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C compiler.
+*/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+* Invokes a unary function accepting and returning half-precision floating-point numbers.
+*/
+napi_value stdlib_math_base_napi_h_h( napi_env env, napi_callback_info info, stdlib_float16_t (*fcn)( stdlib_float16_t ) );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // !STDLIB_MATH_BASE_NAPI_UNARY_H_H_H

lib/node_modules/@stdlib/math/base/napi/unary/manifest.json

@@ -32,6 +32,7 @@
         "./src/d_f.c",
         "./src/f_f.c",
         "./src/f_i.c",
+        "./src/h_h.c",
         "./src/i_d.c",
         "./src/i_f.c",
         "./src/i_i.c",
@@ -51,7 +52,10 @@
         "@stdlib/complex/float32/ctor",
         "@stdlib/complex/float64/ctor",
         "@stdlib/complex/float64/reim",
-        "@stdlib/complex/float32/reim"
+        "@stdlib/complex/float32/reim",
+        "@stdlib/number/float16/ctor",
+        "@stdlib/number/float64/base/to-float16",
+        "@stdlib/number/float16/base/to-float64"
       ]
     }
   ]

lib/node_modules/@stdlib/math/base/napi/unary/src/h_h.c

@@ -0,0 +1,74 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2026 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "stdlib/math/base/napi/unary/h_h.h"
+#include "stdlib/number/float64/base/to_float16.h"
+#include "stdlib/number/float16/base/to_float64.h"
+#include "stdlib/number/float16/ctor.h"
+#include <node_api.h>
+#include <assert.h>
+
+/**
+* Invokes a unary function accepting and returning half-precision floating-point numbers.
+*
+* ## Notes
+*
+* -   This function expects that the callback `info` argument provides access to the following JavaScript arguments:
+*
+*     -   `x`: input value.
+*
+* @param env    environment under which the function is invoked
+* @param info   callback data
+* @param fcn    unary function
+* @return       function return value as a Node-API half-precision floating-point number
+*/
+napi_value stdlib_math_base_napi_h_h( napi_env env, napi_callback_info info, stdlib_float16_t (*fcn)( stdlib_float16_t ) ) {
+	napi_status status;
+
+	size_t argc = 1;
+	napi_value argv[ 1 ];
+	status = napi_get_cb_info( env, info, &argc, argv, NULL, NULL );
+	assert( status == napi_ok );
+
+	if ( argc < 1 ) {
+		status = napi_throw_error( env, NULL, "invalid invocation. Must provide a number." );
+		assert( status == napi_ok );
+		return NULL;
+	}
+
+	napi_valuetype vtype0;
+	status = napi_typeof( env, argv[ 0 ], &vtype0 );
+	assert( status == napi_ok );
+	if ( vtype0 != napi_number ) {
+		status = napi_throw_type_error( env, NULL, "invalid argument. Must provide a number." );
+		assert( status == napi_ok );
+		return NULL;
+	}
+
+	double x;
+	status = napi_get_value_double( env, argv[ 0 ], &x );
+	assert( status == napi_ok );
+
+	stdlib_float16_t out = fcn( stdlib_base_float64_to_float16( x ) );
+
+	napi_value v;
+	status = napi_create_double( env, stdlib_base_float16_to_float64( out ), &v );
+	assert( status == napi_ok );
+
+	return v;
+}