feat: add support for struct data types

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/assert/is-data-type/README.md

@@ -42,7 +42,7 @@ var isDataType = require( '@stdlib/ndarray/base/assert/is-data-type' );
 
 #### isDataType( value )
 
-Tests if an input `value` is a supported ndarray data type.
+Tests if an input value is a supported ndarray data type.
 
 ```javascript
 var bool = isDataType( 'float32' );
@@ -60,6 +60,10 @@ bool = isDataType( 'int32' );
 
 <section class="notes">
 
+## Notes
+
+-   The function returns `true` when provided any supported ndarray [data type][@stdlib/ndarray/dtypes] and when provided a [struct][@stdlib/dstructs/struct] constructor describing a fixed-width composite data type.
+
 </section>
 
 <!-- /.notes -->
@@ -139,6 +143,10 @@ bool = isDataType( 'foo' );
 
 <section class="links">
 
+[@stdlib/ndarray/dtypes]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/dtypes
+
+[@stdlib/dstructs/struct]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/dstructs/struct
+
 </section>
 
 <!-- /.links -->

lib/node_modules/@stdlib/ndarray/base/assert/is-data-type/lib/main.js

@@ -20,17 +20,21 @@
 
 // MODULES //
 
+var isStructDataType = require( '@stdlib/ndarray/base/assert/is-struct-data-type' );
 var contains = require( '@stdlib/array/base/assert/contains' ).factory;
 var dtypes = require( '@stdlib/ndarray/dtypes' );
 
 
+// VARIABLES //
+
+var isDType = contains( dtypes() );
+
+
 // MAIN //
 
 /**
 * Tests whether an input value is a supported ndarray data type.
 *
-* @name isDataType
-* @type {Function}
 * @param {*} v - value to test
 * @returns {boolean} boolean indicating whether an input value is a supported ndarray data type
 *
@@ -71,7 +75,9 @@ var dtypes = require( '@stdlib/ndarray/dtypes' );
 * bool = isDataType( 'foo' );
 * // returns false
 */
-var isDataType = contains( dtypes() );
+function isDataType( v ) {
+	return ( isDType( v ) || isStructDataType( v ) );
+}
 
 
 // EXPORTS //

lib/node_modules/@stdlib/ndarray/base/assert/is-data-type/test/test.js

@@ -21,9 +21,20 @@
 // MODULES //
 
 var tape = require( 'tape' );
+var structFactory = require( '@stdlib/dstructs/struct' );
 var isDataType = require( './../lib' );
 
 
+// VARIABLES //
+
+var Struct = structFactory([
+	{
+		'name': 'foo',
+		'type': 'float64'
+	}
+]);
+
+
 // TESTS //
 
 tape( 'main export is a function', function test( t ) {
@@ -50,7 +61,10 @@ tape( 'the function returns `true` if provided a supported ndarray data type', f
 		'uint16',
 		'uint32',
 		'uint8',
-		'uint8c'
+		'uint8c',
+
+		// Custom struct dtypes:
+		Struct
 	];
 	for ( i = 0; i < values.length; i++ ) {
 		bool = isDataType( values[ i ] );