In my knowledge, there are some differences: - in error reporting: type aliases may be replaced by their definition in error reporting. - you cannot create un

In my knowledge, there are some differences: - in error reporting: type aliases may be replaced by their definition in error reporting. - you cannot create union types with interfaces - legacy versions of TypeScript does not enable to create recursive type aliases such as type `List<V> = {v: V, right: List<V> | undefined }` - interfaces with same name are merged However the frontier between type aliases and interfaces seems more and more blur. Generally interfaces are encouraged over type aliases. I personally prefer type aliases because there are more capable and seems more elegant to me. However their poor support in error reporting makes me rely more on interfaces when possible.