feat: add plot/vega/transform/collect

Author: gururaj1512

lib/node_modules/@stdlib/plot/vega/transform/collect/examples/index.js

@@ -0,0 +1,38 @@
+/**
+* @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';
+
+var Compare = require( '@stdlib/plot/vega/compare/ctor' );
+var CollectTransform = require( './../lib' );
+
+var compare = new Compare({
+	'field': 'amount'
+});
+
+var transform = new CollectTransform({
+	'sort': compare
+});
+console.log( transform.toJSON() );
+
+compare = new Compare({
+	'field': [ 'amount', 'date' ],
+	'order': [ 'descending', 'ascending' ]
+});
+transform.sort = compare;
+console.log( transform.toJSON() );

lib/node_modules/@stdlib/plot/vega/transform/collect/lib/change_event.js

@@ -0,0 +1,41 @@
+/**
+* @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 a new change event object.
+*
+* @private
+* @param {string} property - property name
+* @returns {Object} event object
+*/
+function event( property ) { // eslint-disable-line stdlib/no-redeclare
+	return {
+		'type': 'update',
+		'source': 'transform',
+		'property': property
+	};
+}
+
+
+// EXPORTS //
+
+module.exports = event;

lib/node_modules/@stdlib/plot/vega/transform/collect/lib/index.js

@@ -0,0 +1,48 @@
+/**
+* @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';
+
+/**
+* Collect transform constructor.
+*
+* @module @stdlib/plot/vega/transform/collect
+*
+* @example
+* var Compare = require( '@stdlib/plot/vega/compare/ctor' );
+* var CollectTransform = require( '@stdlib/plot/vega/transform/collect' );
+*
+* var compare = new Compare({
+*     'field': 'amount'
+* });
+* // returns <Compare>
+*
+* var transform = new CollectTransform({
+*     'sort': compare
+* });
+* // returns <CollectTransform>
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;