Kinda like that. Simple example: Lets say you can submit one of these payloads { type: 'SET_PERSON', payload: Person } and { type: 'SET_AGE', payload: number

Kinda like that. Simple example: Lets say you can submit one of these payloads { type: 'SET_PERSON', payload: Person } and { type: 'SET_AGE', payload: number } Based on what type field equals to, TLS (Typescript Language Server - used by IDEs) and TSC (TypeScript Compiler) will know type of payload. It’s already possible to achieve that to some extent, but it’s really limited.