Tsup generates a typings file that assumes the name of the isRunning exported variable as "isLoading" incorrectly. Obviously if you use this, it doesn't work and if you use isRunning, Typescript errors.

Check out the client.d.ts file at https://www.npmjs.com/package/zact?activeTab=code

Anyway, I guess it's not ever a good idea to not keep your state variable name and setter aligned like you do here: