refactor: perform explicit dtype validation

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---

Author: kgryte

lib/node_modules/@stdlib/array/ones-like/lib/main.js

@@ -20,17 +20,22 @@
 
 // MODULES //
 
+var contains = require( '@stdlib/array/base/assert/contains' ).factory;
 var dtype = require( '@stdlib/array/dtype' );
 var full = require( '@stdlib/array/full' );
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var Complex64 = require( '@stdlib/complex/float32/ctor' );
+var dtypes = require( '@stdlib/array/dtypes' );
+var join = require( '@stdlib/array/base/join' );
 var format = require( '@stdlib/string/format' );
 
 
 // VARIABLES //
 
 var Z128 = new Complex128( 1.0, 0.0 );
 var Z64 = new Complex64( 1.0, 0.0 );
+var DTYPES = dtypes( 'numeric_and_generic' );
+var isValidDType = contains( DTYPES );
 
 
 // MAIN //
@@ -62,6 +67,11 @@ function onesLike( x ) {
 	}
 	if ( arguments.length > 1 ) {
 		dt = arguments[ 1 ];
+		if ( !isValidDType( dt ) ) {
+			throw new TypeError( format( 'invalid argument. Second argument must be one of the following: "%s". Value: `%s`.', join( DTYPES, '", "' ), dt ) );
+		}
+	} else if ( !isValidDType( dt ) ) {
+		throw new TypeError( format( 'invalid argument. First argument must have one of the following data types: "%s". Value: `%s`.', join( DTYPES, '", "' ), dt ) );
 	}
 	if ( dt === 'complex128' ) {
 		v = Z128;