diff --git a/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/examples/index.js b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/examples/index.js
new file mode 100644
index 000000000000..960afb53e6c1
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/examples/index.js
@@ -0,0 +1,45 @@
+/**
+* @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 Value = require( '@stdlib/plot/vega/value/ctor' );
+var RuleEncodingSet = require( '@stdlib/plot/vega/mark/rule/encoding-set' );
+var RuleEncoding = require( '@stdlib/plot/vega/mark/rule/encoding' );
+var RuleMark = require( './../lib' );
+
+var mark = new RuleMark({
+	'encode': new RuleEncoding({
+		'enter': new RuleEncodingSet({
+			'stroke': new Value({
+				'value': '#000'
+			})
+		}),
+		'update': new RuleEncodingSet({
+			'stroke': new Value({
+				'value': 'steelblue'
+			})
+		}),
+		'exit': new RuleEncodingSet({
+			'stroke': new Value({
+				'value': '#fff'
+			})
+		})
+	})
+});
+console.log( mark.toJSON() );
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/change_event.js b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/change_event.js
new file mode 100644
index 000000000000..359afbfa206b
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/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': 'mark',
+		'property': property
+	};
+}
+
+
+// EXPORTS //
+
+module.exports = event;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/defaults.js b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/defaults.js
new file mode 100644
index 000000000000..2094acda35d1
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/defaults.js
@@ -0,0 +1,51 @@
+/**
+* @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 RuleEncoding = require( '@stdlib/plot/vega/mark/rule/encoding' );
+
+
+// MAIN //
+
+/**
+* Returns defaults.
+*
+* @private
+* @returns {Object} default options
+*
+* @example
+* var o = defaults();
+* // returns {...}
+*/
+function defaults() {
+	return {
+		// Visual encoding rules for rule mark properties:
+		'encode': new RuleEncoding(),
+
+		// Mark type:
+		'type': 'rule'
+	};
+}
+
+
+// EXPORTS //
+
+module.exports = defaults;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/encode/get.js b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/encode/get.js
new file mode 100644
index 000000000000..13cb2e26efad
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/encode/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 set of visual encoding rules for rule mark properties.
+*
+* @private
+* @returns {(RuleEncoding|void)} encodings
+*/
+function get() {
+	return this[ prop.private ];
+}
+
+
+// EXPORTS //
+
+module.exports = get;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/encode/properties.js b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/encode/properties.js
new file mode 100644
index 000000000000..534754763d4e
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/encode/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( 'encode' );
+
+
+// EXPORTS //
+
+module.exports = obj;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/encode/set.js b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/encode/set.js
new file mode 100644
index 000000000000..0f2876fcd781
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/encode/set.js
@@ -0,0 +1,66 @@
+/**
+* @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 isRuleMarkEncoding = require( '@stdlib/plot/vega/base/assert/is-rule-mark-encoding' );
+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:mark:rule:set:'+prop.name );
+
+
+// MAIN //
+
+/**
+* Sets the visual encoding rules for rule mark properties.
+*
+* ## Notes
+*
+* -   Providing `undefined` "unsets" the configured value.
+*
+* @private
+* @param {(Encoding|void)} value - input value
+* @throws {TypeError} must be a rule mark encoding instance
+* @returns {void}
+*/
+function set( value ) {
+	if ( !isRuleMarkEncoding( value ) && !isUndefined( value ) ) {
+		throw new TypeError( format( 'invalid assignment. `%s` must be a rule mark encoding instance. Value: `%s`.', prop.name, value ) );
+	}
+	if ( value !== 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 ) );
+	}
+}
+
+
+// EXPORTS //
+
+module.exports = set;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/index.js b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/index.js
new file mode 100644
index 000000000000..f92c28952831
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/index.js
@@ -0,0 +1,40 @@
+/**
+* @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';
+
+/**
+* Rule mark constructor.
+*
+* @module @stdlib/plot/vega/mark/rule/ctor
+*
+* @example
+* var RuleMark = require( '@stdlib/plot/vega/mark/rule/ctor' );
+*
+* var mark = new RuleMark();
+* // returns <RuleMark>
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/main.js b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/main.js
new file mode 100644
index 000000000000..46f9d2674e9d
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/lib/main.js
@@ -0,0 +1,162 @@
+/**
+* @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 stdlib/no-empty-lines-between-requires */
+
+'use strict';
+
+// MODULES //
+
+var logger = require( 'debug' );
+var isObject = require( '@stdlib/assert/is-object' );
+var setNonEnumerableReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
+var setReadWriteAccessor = require( '@stdlib/utils/define-read-write-accessor' );
+var hasProp = require( '@stdlib/assert/has-property' );
+var inherit = require( '@stdlib/utils/inherit' );
+var transformErrorMessage = require( '@stdlib/plot/vega/base/transform-validation-message' );
+var Mark = require( '@stdlib/plot/vega/mark/base/ctor' );
+var format = require( '@stdlib/string/format' );
+var defaults = require( './defaults.js' );
+
+// Note: keep the following in alphabetical order according to the `require` path...
+var getEncode = require( './encode/get.js' );
+var setEncode = require( './encode/set.js' );
+
+
+// VARIABLES //
+
+var debug = logger( 'vega:mark:rule:main' );
+
+
+// MAIN //
+
+/**
+* Rule mark constructor.
+*
+* @constructor
+* @param {Options} options - constructor options
+* @param {boolean} [options.aria=true] - boolean indicating whether to include ARIA attributes in SVG output
+* @param {(boolean|Signal|Object)} [options.clip=false] - setting indicating whether to clip marks to a specified shape
+* @param {string} [options.description] - text description of a mark for ARIA accessibility
+* @param {RuleEncoding} [options.encode] - visual encoding rules for mark properties
+* @param {DataSource} [options.from] - object describing the data a mark should visualize
+* @param {boolean} [options.interactive=true] - boolean indicating whether a mark can serve as an input event source
+* @param {(string|Object)} [options.key] - data field to use as a unique key for data binding
+* @param {string} [options.name] - unique name
+* @param {string} [options.role] - metadata string indicating the role of a mark
+* @param {Object} [options.sort] - comparator for sorting mark items
+* @param {(string|Array<string>)} [options.style] - custom styles to apply to a mark
+* @param {Array<Transform>} [options.transforms=[]] - list of post-encoding transforms to apply after any "encode" blocks and which operate directly on mark scenegraph items
+* @param {Array<Trigger>} [options.triggers=[]] - list of triggers for modifying mark properties in response to signal changes
+* @param {number} [options.zindex=0] - integer z-index indicating the layering of a mark relative to other marks
+* @throws {TypeError} options argument must be an object
+* @throws {Error} must provide valid options
+* @returns {RuleMark} rule mark instance
+*
+* @example
+* var mark = new RuleMark();
+* // returns <RuleMark>
+*/
+function RuleMark( options ) {
+	var nargs;
+	var props;
+	var v;
+	var k;
+	var i;
+
+	nargs = arguments.length;
+	if ( !( this instanceof RuleMark ) ) {
+		if ( nargs === 0 ) {
+			return new RuleMark();
+		}
+		return new RuleMark( options );
+	}
+	Mark.call( this, defaults() ); // note: explicitly called without provided options, as we want to perform our own validation
+
+	if ( nargs ) {
+		if ( !isObject( options ) ) {
+			throw new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
+		}
+		// Validate provided options by attempting to assign option values to corresponding fields...
+		props = this.properties;
+		for ( i = 0; i < props.length; i++ ) {
+			k = props[ 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;
+}
+
+/*
+* Inherit from the `Mark` prototype.
+*/
+inherit( RuleMark, Mark );
+
+/**
+* Constructor name.
+*
+* @private
+* @name name
+* @memberof RuleMark
+* @readonly
+* @type {string}
+*/
+setNonEnumerableReadOnly( RuleMark, 'name', 'RuleMark' );
+
+/**
+* Visual encoding rules for rule mark properties.
+*
+* @name encode
+* @memberof RuleMark.prototype
+* @type {(RuleEncoding|void)}
+*
+* @example
+* var Value = require( '@stdlib/plot/vega/value/ctor' );
+* var EncodingSet = require( '@stdlib/plot/vega/mark/rule/encoding-set' );
+* var Encoding = require( '@stdlib/plot/vega/mark/rule/encoding' );
+*
+* var mark = new RuleMark({
+*     'encode': new Encoding({
+*         'enter': new EncodingSet({
+*              'stroke': new Value({
+*                  'value': 'steelblue'
+*              })
+*         })
+*     })
+* });
+*
+* var v = mark.encode;
+* // returns {...}
+*/
+setReadWriteAccessor( RuleMark.prototype, 'encode', getEncode, setEncode );
+
+
+// EXPORTS //
+
+module.exports = RuleMark;
diff --git a/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/package.json b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/package.json
new file mode 100644
index 000000000000..2d1cf326cc0c
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/mark/rule/ctor/package.json
@@ -0,0 +1,62 @@
+{
+  "name": "@stdlib/plot/vega/mark/rule/ctor",
+  "version": "0.0.0",
+  "description": "Rule mark 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",
+    "mark",
+    "rule",
+    "encoding",
+    "constructor",
+    "ctor"
+  ],
+  "__stdlib__": {}
+}