react demo 1 compile fail - 'SVG' cannot be used as a JSX component.

the theme is not touched at all but cannot be built due to compile errors:

node v16.14.2
npm 8.5.0

$ npm run build

> demo1@8.0.38 build
> react-scripts build

Creating an optimized production build...
=============

WARNING: You are currently running a version of TypeScript which is not officially supported by @typescript-eslint/typescript-estree.

You may find that it works just fine, or you may not.

SUPPORTED TYPESCRIPT VERSIONS: >=3.3.1 13 |
| ^
14 |
15 | )
16 | }