refactor: use isFontStyle,isFontWeight in title setters

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---

Author: Sachinn-64

lib/node_modules/@stdlib/plot/vega/title/ctor/lib/font-style/set.js

@@ -23,8 +23,9 @@
 // MODULES //
 
 var logger = require( 'debug' );
-var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
-var isUndefined = require( '@stdlib/assert/is-undefined' );
+var isFontStyle = require( '@stdlib/plot/vega/base/assert/is-font-style' );
+var join = require( '@stdlib/array/base/join' );
+var fontStyles = require( '@stdlib/plot/vega/base/font-styles' );
 var format = require( '@stdlib/string/format' );
 var changeEvent = require( './../change_event.js' );
 var prop = require( './properties.js' );
@@ -40,18 +41,14 @@ var debug = logger( 'vega:title:set:'+prop.name );
 /**
 * Sets the font style of the title text.
 *
-* ## Notes
-*
-* -   Providing `undefined` "unsets" the configured value.
-*
 * @private
-* @param {(string|void)} value - input value
-* @throws {TypeError} must be a string
+* @param {string} value - input value
+* @throws {TypeError} must be a valid font style
 * @returns {void}
 */
 function set( value ) {
-	if ( !isString( value ) && !isUndefined( value ) ) {
-		throw new TypeError( format( 'invalid assignment. `%s` must be a string. Value: `%s`.', prop.name, value ) );
+	if ( !isFontStyle( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be one of the following: "%s". Value: `%s`.', prop.name, join( fontStyles(), '", "' ), value ) );
 	}
 	if ( value !== this[ prop.private ] ) {
 		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );

lib/node_modules/@stdlib/plot/vega/title/ctor/lib/font-weight/set.js

@@ -23,9 +23,10 @@
 // MODULES //
 
 var logger = require( 'debug' );
-var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
-var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
-var isUndefined = require( '@stdlib/assert/is-undefined' );
+var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
+var isFontWeight = require( '@stdlib/plot/vega/base/assert/is-font-weight' );
+var join = require( '@stdlib/array/base/join' );
+var fontWeights = require( '@stdlib/plot/vega/base/font-weights' );
 var format = require( '@stdlib/string/format' );
 var changeEvent = require( './../change_event.js' );
 var prop = require( './properties.js' );
@@ -43,16 +44,19 @@ var debug = logger( 'vega:title:set:'+prop.name );
 *
 * ## Notes
 *
-* -   Providing `undefined` "unsets" the configured value.
+* -   If provided a number, the value is converted to a string.
 *
 * @private
-* @param {(number|string|void)} value - input value
-* @throws {TypeError} must be a number or string
+* @param {(number|string)} value - input value
+* @throws {TypeError} must be a valid font weight
 * @returns {void}
 */
 function set( value ) {
-	if ( !isNumber( value ) && !isString( value ) && !isUndefined( value ) ) {
-		throw new TypeError( format( 'invalid assignment. `%s` must be a number or string. Value: `%s`.', prop.name, value ) );
+	if ( isNonNegativeInteger( value ) ) {
+		value = String( value );
+	}
+	if ( !isFontWeight( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be one of the following: "%s". Value: `%s`.', prop.name, join( fontWeights(), '", "' ), value ) );
 	}
 	if ( value !== this[ prop.private ] ) {
 		debug( 'Current value: %s. New value: %s.', this[ prop.private ], value );