Property 'Unit' does not exist on type 'MathJsStatic'. Did you mean 'unit'? error in Typescript

When creating the following code in Typescript

import { MathJsStatic, create, all, MathType } from 'mathjs';
const math: MathJsStatic = create(all, {}) as MathJsStatic;

math.createUnit('cells'); // works perfectly
math.Unit; // results in: Property 'Unit' does not exist on type 'MathJsStatic'. Did you mean 'unit'?

It looks like Unit isn't properly part of the new MathJS typescript definitions or it's not linking correctly.

if I replace the line above with window['testing'] = math then the Unit is in fact present.

Edit: I am running mathjs 9.4.4 without @types/mathjs (relying on the built-in type definitions)