refactor: test for an array of marks and enable event listening

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---

Author: kgryte

lib/node_modules/@stdlib/plot/vega/builder/lib/marks/set.js

@@ -23,7 +23,8 @@
 // MODULES //
 
 var logger = require( 'debug' );
-var isArrayLikeObject = require( '@stdlib/assert/is-array-like-object' );
+var isMarkArray = require( '@stdlib/plot/vega/base/assert/is-mark-array' );
+var isEmptyArrayLikeObject = require( '@stdlib/assert/is-empty-array-like-object' );
 var hasEqualValues = require( '@stdlib/array/base/assert/has-equal-values' );
 var copy = require( '@stdlib/array/base/copy' );
 var format = require( '@stdlib/string/format' );
@@ -47,7 +48,7 @@ var debug = logger( 'vega:builder:set:'+prop.name );
 * @returns {void}
 */
 function set( value ) {
-	if ( !isArrayLikeObject( value ) ) { // FIXME: validate array of marks or an empty array
+	if ( !isMarkArray( value ) && !isEmptyArrayLikeObject( value ) ) {
 		throw new TypeError( format( 'invalid assignment. `%s` must be an array of marks. Value: `%s`.', prop.name, value ) );
 	}
 	value = copy( value );