feat: update DiscreteScale to use ordinal type as default scale type

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---

Author: gururaj1512

lib/node_modules/@stdlib/plot/vega/scale/discrete/examples/index.js

@@ -22,7 +22,7 @@ var DiscreteScale = require( './../lib' );
 
 var scale = new DiscreteScale({
 	'name': 'xScale',
-	'type': 'ordinal'
+	'type': 'point'
 });
 
 console.log( scale.toJSON() );

lib/node_modules/@stdlib/plot/vega/scale/discrete/lib/defaults.js

@@ -0,0 +1,43 @@
+/**
+* @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.
+*/
+
+'use strict';
+
+// MAIN //
+
+/**
+* Returns defaults.
+*
+* @private
+* @returns {Object} default options
+*
+* @example
+* var o = defaults();
+* // returns {...}
+*/
+function defaults() {
+	return {
+		// Scale type:
+		'type': 'ordinal'
+	};
+}
+
+
+// EXPORTS //
+
+module.exports = defaults;

lib/node_modules/@stdlib/plot/vega/scale/discrete/lib/index.js

@@ -27,8 +27,7 @@
 * var DiscreteScale = require( '@stdlib/plot/vega/scale/discrete' );
 *
 * var scale = new DiscreteScale({
-*     'name': 'xScale',
-*     'type': 'ordinal'
+*     'name': 'xScale'
 * });
 * // returns <DiscreteScale>
 */

lib/node_modules/@stdlib/plot/vega/scale/discrete/lib/main.js

@@ -29,11 +29,13 @@ var setNonEnumerableReadOnly = require( '@stdlib/utils/define-nonenumerable-read
 var setNonEnumerableReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' ); // eslint-disable-line id-length
 var hasProp = require( '@stdlib/assert/has-property' );
 var inherit = require( '@stdlib/utils/inherit' );
+var objectKeys = require( '@stdlib/utils/keys' );
 var transformErrorMessage = require( '@stdlib/plot/vega/base/transform-validation-message' );
 var instance2json = require( '@stdlib/plot/vega/base/to-json' );
 var Scale = require( '@stdlib/plot/vega/scale/base/ctor' );
 var format = require( '@stdlib/string/format' );
 var properties = require( './properties.json' );
+var defaults = require( './defaults.js' );
 
 // Note: keep the following in alphabetical order according to the `require` path...
 var getProperties = require( './properties/get.js' );
@@ -55,7 +57,6 @@ var debug = logger( 'vega:discrete-scale:main' );
 * @constructor
 * @param {Options} options - constructor options
 * @param {string} options.name - scale name
-* @param {string} options.type - scale type
 * @param {(Collection|Object|Signal)} [options.domain] - domain of associated data values
 * @param {number} [options.domainMax] - maximum value in the scale domain (overrides the `domain` option)
 * @param {number} [options.domainMin] - minimum value in the scale domain (overrides the `domain` option)
@@ -65,18 +66,20 @@ var debug = logger( 'vega:discrete-scale:main' );
 * @param {(Collection|Object|Signal|string)} [options.range] - scale range
 * @param {boolean} [options.reverse=false] - boolean indicating whether to reverse the order of the scale range
 * @param {boolean} [options.round=false] - boolean indicating whether to round numeric output values to integers
+* @param {string} [options.type='ordinal'] - scale type
 * @throws {TypeError} options argument must be an object
 * @throws {Error} must provide valid options
 * @returns {DiscreteScale} scale instance
 *
 * @example
 * var scale = new DiscreteScale({
-*     'name': 'xScale',
-*     'type': 'ordinal'
+*     'name': 'xScale'
 * });
 * // returns <DiscreteScale>
 */
 function DiscreteScale( options ) {
+	var opts;
+	var keys;
 	var v;
 	var k;
 	var i;
@@ -90,14 +93,19 @@ function DiscreteScale( options ) {
 	if ( !hasProp( options, 'name' ) ) {
 		throw new TypeError( 'invalid argument. Options argument must specify the scale name.' );
 	}
-	if ( !hasProp( options, 'type' ) ) {
-		throw new TypeError( 'invalid argument. Options argument must specify the scale type.' );
-	}
 	Scale.call( this, {
-		'name': options.name,
-		'type': options.type
+		'name': options.name
 	});
 
+	// Resolve the default configuration:
+	opts = defaults();
+
+	// Set internal properties according to the default configuration...
+	keys = objectKeys( opts );
+	for ( i = 0; i < keys.length; i++ ) {
+		k = keys[ i ];
+		this[ '_'+k ] = opts[ k ];
+	}
 	// Validate provided options by attempting to assign option values to corresponding fields...
 	for ( i = 0; i < properties.length; i++ ) {
 		k = properties[ i ];
@@ -142,8 +150,7 @@ setNonEnumerableReadOnly( DiscreteScale, 'name', 'DiscreteScale' );
 *
 * @example
 * var scale = new DiscreteScale({
-*     'name': 'xScale',
-*     'type': 'ordinal'
+*     'name': 'xScale'
 * });
 *
 * var v = scale.properties;
@@ -157,11 +164,11 @@ setNonEnumerableReadOnlyAccessor( DiscreteScale.prototype, 'properties', getProp
 * @name type
 * @memberof DiscreteScale.prototype
 * @type {string}
+* @default 'ordinal'
 *
 * @example
 * var scale = new DiscreteScale({
-*     'name': 'xScale',
-*     'type': 'ordinal'
+*     'name': 'xScale'
 * });
 *
 * var v = scale.type;
@@ -183,8 +190,7 @@ setReadWriteAccessor( DiscreteScale.prototype, 'type', getType, setType );
 *
 * @example
 * var scale = new DiscreteScale({
-*     'name': 'xScale',
-*     'type': 'ordinal'
+*     'name': 'xScale'
 * });
 *
 * var v = scale.toJSON();