diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/examples/index.js b/lib/node_modules/@stdlib/plot/vega/transform/collect/examples/index.js
new file mode 100644
index 000000000000..4a81cdf88842
--- /dev/null
+++ b/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() );
diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/change_event.js b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/change_event.js
new file mode 100644
index 000000000000..e444f9c667b0
--- /dev/null
+++ b/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;
diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/index.js b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/index.js
new file mode 100644
index 000000000000..2a64e3353b14
--- /dev/null
+++ b/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;
diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/main.js b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/main.js
new file mode 100644
index 000000000000..40c13905c50d
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/main.js
@@ -0,0 +1,293 @@
+/**
+* @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.
+*/
+
+/* eslint-disable no-restricted-syntax, no-invalid-this, stdlib/no-empty-lines-between-requires */
+
+'use strict';
+
+// MODULES //
+
+var EventEmitter = require( 'events' ).EventEmitter;
+var logger = require( 'debug' );
+var isObject = require( '@stdlib/assert/is-object' );
+var setNonEnumerableReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
+var setNonEnumerableReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' ); // eslint-disable-line id-length
+var setReadWriteAccessor = require( '@stdlib/utils/define-read-write-accessor' );
+var hasProp = require( '@stdlib/assert/has-property' );
+var inherit = require( '@stdlib/utils/inherit' );
+var instance2json = require( '@stdlib/plot/vega/base/to-json' );
+var transformErrorMessage = require( '@stdlib/plot/vega/base/transform-validation-message' );
+var format = require( '@stdlib/string/format' );
+var properties = require( './properties.json' );
+
+// Note: keep the following in alphabetical order according to the `require` path...
+var getProperties = require( './properties/get.js' );
+
+var getSort = require( './sort/get.js' );
+var setSort = require( './sort/set.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:collect-transform:main' );
+
+
+// MAIN //
+
+/**
+* Collect transform constructor.
+*
+* @constructor
+* @param {Options} options - constructor options
+* @param {Compare} options.sort - comparator definition for sorting data objects
+* @throws {TypeError} options argument must be an object
+* @throws {Error} must provide valid options
+* @returns {CollectTransform} collect transform instance
+*
+* @example
+* var Compare = require( '@stdlib/plot/vega/compare/ctor' );
+*
+* var compare = new Compare({
+*     'field': 'amount'
+* });
+* // returns <Compare>
+*
+* var transform = new CollectTransform({
+*     'sort': compare
+* });
+* // returns <CollectTransform>
+*/
+function CollectTransform( options ) {
+	var self;
+	var v;
+	var k;
+	var i;
+	if ( !( this instanceof CollectTransform ) ) {
+		return new CollectTransform( options );
+	}
+	self = this;
+	EventEmitter.call( this );
+
+	if ( !isObject( options ) ) {
+		throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
+	}
+
+	// Define an internal change event listener:
+	this._onChange = onChange;
+
+	// Add change listeners to default event emitters:
+	if ( this._sort && typeof this._sort.on === 'function' ) {
+		this._addChangeListener( this._sort );
+	}
+
+	// Validate provided options by attempting to assign option values to corresponding fields...
+	for ( i = 0; i < properties.length; i++ ) {
+		k = properties[ i ];
+		if ( !hasProp( options, k ) ) {
+			continue;
+		}
+		v = options[ k ];
+		try {
+			this[ k ] = v;
+		} catch ( err ) {
+			debug( 'Encountered an error. Error: %s', err.message );
+
+			// FIXME: retain thrown error type
+			throw new Error( transformErrorMessage( err.message ) );
+		}
+	}
+	return this;
+
+	/**
+	* Callback invoked upon a change event.
+	*
+	* @private
+	* @param {Object} event - event object
+	*/
+	function onChange( event ) {
+		debug( 'Received a change event: %s', JSON.stringify( event ) );
+		self.emit( 'change', event );
+	}
+}
+
+/*
+* Inherit from the `EventEmitter` prototype.
+*/
+inherit( CollectTransform, EventEmitter );
+
+/**
+* Constructor name.
+*
+* @private
+* @name name
+* @memberof CollectTransform
+* @readonly
+* @type {string}
+*/
+setNonEnumerableReadOnly( CollectTransform, 'name', 'CollectTransform' );
+
+/**
+* Adds an internal listener to a change event on a child instance.
+*
+* @private
+* @name _addChangeListener
+* @memberof CollectTransform.prototype
+* @type {Function}
+* @param {Object} emitter - event emitter
+* @returns {CollectTransform} collect transform instance
+*/
+setNonEnumerableReadOnly( CollectTransform.prototype, '_addChangeListener', function addChangeListener( emitter ) {
+	if ( emitter && typeof emitter.on === 'function' ) {
+		emitter.on( 'change', this._onChange );
+	}
+	return this;
+});
+
+/**
+* Adds internal listeners to change events on child instances.
+*
+* @private
+* @name _addChangeListeners
+* @memberof CollectTransform.prototype
+* @type {Function}
+* @param {ArrayLikeObject<Object>} emitters - list of event emitters
+* @returns {CollectTransform} collect transform instance
+*/
+setNonEnumerableReadOnly( CollectTransform.prototype, '_addChangeListeners', function addChangeListeners( emitters ) {
+	var i;
+	for ( i = 0; i < emitters.length; i++ ) {
+		this._addChangeListener( emitters[ i ] );
+	}
+	return this;
+});
+
+/**
+* Removes an internal listener to a change event on a child instance.
+*
+* @private
+* @name _removeChangeListener
+* @memberof CollectTransform.prototype
+* @type {Function}
+* @param {Object} emitter - event emitter
+* @returns {CollectTransform} collect transform instance
+*/
+setNonEnumerableReadOnly( CollectTransform.prototype, '_removeChangeListener', function removeChangeListener( emitter ) {
+	if ( emitter && typeof emitter.removeListener === 'function' ) {
+		emitter.removeListener( 'change', this._onChange );
+	}
+	return this;
+});
+
+/**
+* Removes internal listeners to change events on child instances.
+*
+* @private
+* @name _removeChangeListeners
+* @memberof CollectTransform.prototype
+* @type {Function}
+* @param {ArrayLikeObject<Object>} emitters - list of event emitters
+* @returns {CollectTransform} collect transform instance
+*/
+setNonEnumerableReadOnly( CollectTransform.prototype, '_removeChangeListeners', function removeChangeListeners( emitters ) {
+	var i;
+	for ( i = 0; i < emitters.length; i++ ) {
+		this._removeChangeListener( emitters[ i ] );
+	}
+	return this;
+});
+
+/**
+* Collect transform properties.
+*
+* @name properties
+* @memberof CollectTransform.prototype
+* @type {Array<string>}
+*
+* @example
+* var Compare = require( '@stdlib/plot/vega/compare/ctor' );
+*
+* var compare = new Compare({
+*     'field': 'amount'
+* });
+*
+* var transform = new CollectTransform({
+*     'sort': compare
+* });
+*
+* var v = transform.properties;
+* // returns [...]
+*/
+setNonEnumerableReadOnlyAccessor( CollectTransform.prototype, 'properties', getProperties );
+
+/**
+* Comparator definition for sorting data objects.
+*
+* @name sort
+* @memberof CollectTransform.prototype
+* @type {(Compare|void)}
+*
+* @example
+* var Compare = require( '@stdlib/plot/vega/compare/ctor' );
+*
+* var compare = new Compare({
+*     'field': 'amount'
+* });
+*
+* var transform = new CollectTransform({
+*     'sort': compare
+* });
+*
+* var v = transform.sort;
+* // returns <Compare>
+*/
+setReadWriteAccessor( CollectTransform.prototype, 'sort', getSort, setSort );
+
+/**
+* Serializes an instance to a JSON object.
+*
+* ## Notes
+*
+* -   This method is implicitly invoked by `JSON.stringify`.
+*
+* @name toJSON
+* @memberof CollectTransform.prototype
+* @type {Function}
+* @returns {Object} JSON object
+*
+* @example
+* var Compare = require( '@stdlib/plot/vega/compare/ctor' );
+*
+* var compare = new Compare({
+*     'field': 'amount'
+* });
+*
+* var transform = new CollectTransform({
+*     'sort': compare
+* });
+*
+* var v = transform.toJSON();
+* // returns {...}
+*/
+setNonEnumerableReadOnly( CollectTransform.prototype, 'toJSON', function toJSON() {
+	return instance2json( this, properties );
+});
+
+
+// EXPORTS //
+
+module.exports = CollectTransform;
diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/properties.json b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/properties.json
new file mode 100644
index 000000000000..7d9fc5df228b
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/properties.json
@@ -0,0 +1,3 @@
+[
+  "sort"
+]
diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/properties/get.js b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/properties/get.js
new file mode 100644
index 000000000000..f3cbb28454ea
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/properties/get.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';
+
+// MODULES //
+
+var properties = require( './../properties.json' );
+
+
+// MAIN //
+
+/**
+* Returns the list of enumerable properties.
+*
+* @private
+* @returns {Array<string>} properties
+*/
+function get() {
+	return properties.slice();
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/sort/get.js b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/sort/get.js
new file mode 100644
index 000000000000..7c7a930a8c68
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/sort/get.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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var prop = require( './properties.js' );
+
+
+// MAIN //
+
+/**
+* Returns the comparator definition for sorting data objects.
+*
+* @private
+* @returns {(Compare|void)} comparator
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/sort/properties.js b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/sort/properties.js
new file mode 100644
index 000000000000..9a3846787a90
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/sort/properties.js
@@ -0,0 +1,33 @@
+/**
+* @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';
+
+// MODULES //
+
+var property2object = require( '@stdlib/plot/vega/base/property2object' );
+
+
+// MAIN //
+
+var obj = property2object( 'sort' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/sort/set.js b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/sort/set.js
new file mode 100644
index 000000000000..797534b0eba9
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/transform/collect/lib/sort/set.js
@@ -0,0 +1,68 @@
+/**
+* @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.
+*/
+
+/* eslint-disable no-invalid-this */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isCompare = require( '@stdlib/plot/vega/base/assert/is-compare' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
+var format = require( '@stdlib/string/format' );
+var changeEvent = require( './../change_event.js' );
+var prop = require( './properties.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:collect-transform:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets the comparator definition for sorting data objects.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Compare|void)} value - input value
+* @throws {TypeError} must be a compare instance
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isCompare( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a compare instance. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== this[ prop.private ] ) {
+		this._removeChangeListener( this[ prop.private ] );
+		debug( 'Current value: %s. New value: %s.', JSON.stringify( this[ prop.private ] ), JSON.stringify( value ) );
+		this[ prop.private ] = value;
+		this.emit( 'change', changeEvent( prop.name ) );
+		this._addChangeListener( this[ prop.private ] );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/transform/collect/package.json b/lib/node_modules/@stdlib/plot/vega/transform/collect/package.json
new file mode 100644
index 000000000000..25ef619b06dd
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/transform/collect/package.json
@@ -0,0 +1,61 @@
+{
+  "name": "@stdlib/plot/vega/transform/collect",
+  "version": "0.0.0",
+  "description": "Collect transform constructor.",
+  "license": "Apache-2.0",
+  "author": {
+    "name": "The Stdlib Authors",
+    "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+  },
+  "contributors": [
+    {
+      "name": "The Stdlib Authors",
+      "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+    }
+  ],
+  "main": "./lib",
+  "directories": {
+    "benchmark": "./benchmark",
+    "doc": "./docs",
+    "example": "./examples",
+    "lib": "./lib",
+    "test": "./test"
+  },
+  "types": "./docs/types",
+  "scripts": {},
+  "homepage": "https://github.com/stdlib-js/stdlib",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/stdlib-js/stdlib.git"
+  },
+  "bugs": {
+    "url": "https://github.com/stdlib-js/stdlib/issues"
+  },
+  "dependencies": {},
+  "devDependencies": {},
+  "engines": {
+    "node": ">=0.10.0",
+    "npm": ">2.7.0"
+  },
+  "os": [
+    "aix",
+    "darwin",
+    "freebsd",
+    "linux",
+    "macos",
+    "openbsd",
+    "sunos",
+    "win32",
+    "windows"
+  ],
+  "keywords": [
+    "stdlib",
+    "plot",
+    "vega",
+    "transform",
+    "collect",
+    "constructor",
+    "ctor"
+  ],
+  "__stdlib__": {}
+}