Personal preference but I would say typescript because, performance is not overly a concern when doing something like infrastructure as code, great static type checking / development integration already provided when using something like vscode and lastly because it has jsx / tsx....And so why jsx, I know that designing a circuit is more akin to a graph data structure and jsx is really more suited to a tree data structure but if you can get over that by defining your nets separately up above the components in the jsx structure then I feel like you can really harness a lot of the benefits that jsx brings to regular UI design. Again this is personal and I've mucked about with this very thing a bit myself.

Im not familiar with pulling a github repo to get at a package, if it allows anybody to make their circuits publicly available, forkable, etc then all good..