feat: update complex/base TypeScript declarations

PR-URL: #9199
Reviewed-by: Athan Reines <kgryte@gmail.com>

Author: stdlib-bot

lib/node_modules/@stdlib/complex/base/docs/types/index.d.ts

@@ -20,6 +20,7 @@
 
 /* eslint-disable max-lines */
 
+import assert = require( '@stdlib/complex/base/assert' );
 import cast = require( '@stdlib/complex/base/cast-return' );
 import parse = require( '@stdlib/complex/base/parse' );
 import wrap = require( '@stdlib/complex/base/wrap-function' );
@@ -28,6 +29,11 @@ import wrap = require( '@stdlib/complex/base/wrap-function' );
 * Interface describing the `base` namespace.
 */
 interface Namespace {
+	/**
+	* Base (i.e., lower-level) complex number assertion functions.
+	*/
+	assert: typeof assert;
+
 	/**
 	* Wraps an n-ary function and casts a function's return value to a complex number.
 	*