diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/README.md b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/README.md
new file mode 100644
index 000000000000..01e91823d2a4
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/README.md
@@ -0,0 +1,125 @@
+
+
+# isDiscretizingScale
+
+> Test if an input value is a [discretizing scale][@stdlib/plot/vega/scale/discretizing].
+
+
+
+
+
+
+
+
+
+
+
+## Usage
+
+```javascript
+var isDiscretizingScale = require( '@stdlib/plot/vega/base/assert/is-discretizing-scale' );
+```
+
+#### isDiscretizingScale( value )
+
+Tests if an input value is a [discretizing scale][@stdlib/plot/vega/scale/discretizing].
+
+```javascript
+var DiscretizingScale = require( '@stdlib/plot/vega/scale/discretizing' );
+
+var v = new DiscretizingScale({
+ 'name': 'xScale'
+});
+var bool = isDiscretizingScale( v );
+// returns true
+
+bool = isDiscretizingScale( {} );
+// returns false
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+## Examples
+
+
+
+```javascript
+var DiscretizingScale = require( '@stdlib/plot/vega/scale/discretizing' );
+var isDiscretizingScale = require( '@stdlib/plot/vega/base/assert/is-discretizing-scale' );
+
+var v = new DiscretizingScale({
+ 'name': 'xScale'
+});
+var bool = isDiscretizingScale( v );
+// returns true
+
+bool = isDiscretizingScale( {} );
+// returns false
+
+bool = isDiscretizingScale( 'foo' );
+// returns false
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+[@stdlib/plot/vega/scale/discretizing]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/plot/vega/scale/discretizing
+
+
+
+
diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/benchmark/benchmark.js b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/benchmark/benchmark.js
new file mode 100644
index 000000000000..ef7b96cf06fe
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/benchmark/benchmark.js
@@ -0,0 +1,93 @@
+/**
+* @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 bench = require( '@stdlib/bench' );
+var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
+var DiscretizingScale = require( '@stdlib/plot/vega/scale/discretizing' );
+var pkg = require( './../package.json' ).name;
+var isDiscretizingScale = require( './../lib' );
+
+
+// MAIN //
+
+bench( pkg+'::true', function benchmark( b ) {
+ var values;
+ var out;
+ var v;
+ var i;
+
+ values = [
+ new DiscretizingScale({
+ 'name': 'xScale'
+ }),
+ new DiscretizingScale({
+ 'name': 'yScale'
+ })
+ ];
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ v = values[ i%values.length ];
+ out = isDiscretizingScale( v );
+ if ( typeof out !== 'boolean' ) {
+ b.fail( 'should return a boolean' );
+ }
+ }
+ b.toc();
+ if ( !isBoolean( out ) ) {
+ b.fail( 'should return a boolean' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+});
+
+bench( pkg+'::false', function benchmark( b ) {
+ var values;
+ var out;
+ var v;
+ var i;
+
+ values = [
+ 'foo',
+ 'bar',
+ '',
+ 'beep',
+ 'boop',
+ [],
+ {}
+ ];
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ v = values[ i%values.length ];
+ out = isDiscretizingScale( v );
+ if ( typeof out !== 'boolean' ) {
+ b.fail( 'should return a boolean' );
+ }
+ }
+ b.toc();
+ if ( !isBoolean( out ) ) {
+ b.fail( 'should return a boolean' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+});
diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/docs/repl.txt b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/docs/repl.txt
new file mode 100644
index 000000000000..0b456662e4d2
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/docs/repl.txt
@@ -0,0 +1,26 @@
+
+{{alias}}( value )
+ Tests if an input value is a discretizing scale instance.
+
+ Parameters
+ ----------
+ value: any
+ Value to test.
+
+ Returns
+ -------
+ bool: boolean
+ Boolean indicating if an input value is a discretizing scale instance.
+
+ Examples
+ --------
+ > var opts = { 'name': 'xScale' };
+ > var v = new {{alias:@stdlib/plot/vega/scale/discretizing}}( opts );
+ > var bool = {{alias}}( v )
+ true
+ > bool = {{alias}}( {} )
+ false
+
+ See Also
+ --------
+
diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/docs/types/index.d.ts b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/docs/types/index.d.ts
new file mode 100644
index 000000000000..590a5caef785
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/docs/types/index.d.ts
@@ -0,0 +1,47 @@
+/*
+* @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.
+*/
+
+// TypeScript Version: 4.1
+
+/**
+* Tests whether an input value is a discretizing scale instance.
+*
+* @param v - value to test
+* @returns boolean indicating whether an input value is a discretizing scale instance
+*
+* @example
+* var DiscretizingScale = require( '@stdlib/plot/vega/scale/discretizing' );
+*
+* var v = new DiscretizingScale({
+* 'name': 'xScale'
+* });
+* var bool = isDiscretizingScale( v );
+* // returns true
+*
+* bool = isDiscretizingScale( {} );
+* // returns false
+*
+* bool = isDiscretizingScale( 'foo' );
+* // returns false
+*/
+declare function isDiscretizingScale( v: any ): boolean;
+
+
+// EXPORTS //
+
+export = isDiscretizingScale;
diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/docs/types/test.ts b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/docs/types/test.ts
new file mode 100644
index 000000000000..8277236fa367
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/docs/types/test.ts
@@ -0,0 +1,34 @@
+/*
+* @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.
+*/
+
+import isDiscretizingScale = require( './index' );
+
+
+// TESTS //
+
+// The function returns a boolean...
+{
+ isDiscretizingScale( {} ); // $ExpectType boolean
+ isDiscretizingScale( 'foo' ); // $ExpectType boolean
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+ isDiscretizingScale(); // $ExpectError
+ isDiscretizingScale( undefined, 123 ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/examples/index.js b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/examples/index.js
new file mode 100644
index 000000000000..eba9ba2099b7
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/examples/index.js
@@ -0,0 +1,37 @@
+/**
+* @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 DiscretizingScale = require( '@stdlib/plot/vega/scale/discretizing' );
+var isDiscretizingScale = require( './../lib' );
+
+var v = new DiscretizingScale({
+ 'name': 'xScale'
+});
+var bool = isDiscretizingScale( v );
+console.log( bool );
+// => true
+
+bool = isDiscretizingScale( {} );
+console.log( bool );
+// => false
+
+bool = isDiscretizingScale( 'foo' );
+console.log( bool );
+// => false
diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/lib/index.js b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/lib/index.js
new file mode 100644
index 000000000000..5b8b7794238c
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/lib/index.js
@@ -0,0 +1,50 @@
+/**
+* @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';
+
+/**
+* Test whether an input value is a discretizing scale instance.
+*
+* @module @stdlib/plot/vega/base/assert/is-discretizing-scale
+*
+* @example
+* var DiscretizingScale = require( '@stdlib/plot/vega/scale/discretizing' );
+* var isDiscretizingScale = require( '@stdlib/plot/vega/base/assert/is-discretizing-scale' );
+*
+* var v = new DiscretizingScale({
+* 'name': 'xScale'
+* });
+* var bool = isDiscretizingScale( v );
+* // returns true
+*
+* bool = isDiscretizingScale( {} );
+* // returns false
+*
+* bool = isDiscretizingScale( 'foo' );
+* // returns false
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/lib/main.js b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/lib/main.js
new file mode 100644
index 000000000000..69cddcad9ac0
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/lib/main.js
@@ -0,0 +1,70 @@
+/**
+* @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 isDiscretizingScaleName = require( '@stdlib/plot/vega/base/assert/is-discretizing-scale-name' );
+var isObject = require( '@stdlib/assert/is-object' );
+var hasProp = require( '@stdlib/assert/has-property' );
+var DiscretizingScale = require( '@stdlib/plot/vega/scale/discretizing' );
+
+
+// MAIN //
+
+/**
+* Tests whether an input value is a discretizing scale instance.
+*
+* @param {*} value - value to test
+* @returns {boolean} boolean indicating whether an input value is a discretizing scale instance
+*
+* @example
+* var DiscretizingScale = require( '@stdlib/plot/vega/scale/discretizing' );
+*
+* var v = new DiscretizingScale({
+* 'name': 'xScale'
+* });
+* var bool = isDiscretizingScale( v );
+* // returns true
+*
+* bool = isDiscretizingScale( {} );
+* // returns false
+*
+* bool = isDiscretizingScale( 'foo' );
+* // returns false
+*/
+function isDiscretizingScale( value ) {
+ return (
+ value instanceof DiscretizingScale ||
+
+ // The following is a set of rather imperfect heuristics for handling instances originating in a different realm...
+ (
+ isObject( value ) &&
+ isDiscretizingScaleName( value.type ) &&
+ hasProp( value, 'name' ) &&
+ hasProp( value, 'domain' ) &&
+ hasProp( value, 'range' )
+ )
+ );
+}
+
+
+// EXPORTS //
+
+module.exports = isDiscretizingScale;
diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/package.json b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/package.json
new file mode 100644
index 000000000000..42b1cacbd207
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/package.json
@@ -0,0 +1,70 @@
+{
+ "name": "@stdlib/plot/vega/base/assert/is-discretizing-scale",
+ "version": "0.0.0",
+ "description": "Test if an input value is a discretizing scale instance.",
+ "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",
+ "base",
+ "vega",
+ "utilities",
+ "utility",
+ "utils",
+ "util",
+ "assert",
+ "test",
+ "check",
+ "is",
+ "valid",
+ "validate",
+ "validation",
+ "isvalid"
+ ],
+ "__stdlib__": {}
+}
diff --git a/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/test/test.js b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/test/test.js
new file mode 100644
index 000000000000..7a7e9252155e
--- /dev/null
+++ b/lib/node_modules/@stdlib/plot/vega/base/assert/is-discretizing-scale/test/test.js
@@ -0,0 +1,88 @@
+/**
+* @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 tape = require( 'tape' );
+var QuantileScale = require( '@stdlib/plot/vega/scale/quantile' );
+var DiscretizingScale = require( '@stdlib/plot/vega/scale/discretizing' );
+var Scale = require( '@stdlib/plot/vega/scale/base/ctor' );
+var isDiscretizingScale = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof isDiscretizingScale, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'the function returns `true` if provided a discretizing scale instance', function test( t ) {
+ var values;
+ var bool;
+ var i;
+
+ values = [
+ new QuantileScale({
+ 'name': 'yScale'
+ }),
+ new DiscretizingScale({
+ 'name': 'zScale'
+ })
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ bool = isDiscretizingScale( values[ i ] );
+ t.strictEqual( bool, true, 'returns expected value when provided '+values[ i ] );
+ }
+ t.end();
+});
+
+tape( 'the function returns `false` if not provided a discretizing scale instance', function test( t ) {
+ var values;
+ var bool;
+ var i;
+
+ values = [
+ new Scale({
+ 'name': 'xScale',
+ 'type': 'linear'
+ }),
+ '',
+ 'beep',
+ 'boop',
+ 'foo',
+ 'bar',
+ 5,
+ NaN,
+ true,
+ false,
+ null,
+ void 0,
+ [],
+ {},
+ function noop() {}
+ ];
+ for ( i = 0; i < values.length; i++ ) {
+ bool = isDiscretizingScale( values[ i ] );
+ t.strictEqual( bool, false, 'returns expected value when provided '+values[ i ] );
+ }
+ t.end();
+});