arcanis has a PR to patch up the issue that's sat for a year plus now. https://github.com/microsoft/TypeScript/issues/43632

> In addition, if you want to have your app load as smaller chunks rather than a single large bundle, you need to be careful to ensure that things work even all the backing reducers aren't yet loaded.

In the decade old application we use redux saga in at work, a large portion of our 7MB minified/gzipped main chunk is redux handlers. It'd be nice if there was a relatively simple way to not synchronously load all the reducers up front.