Originally discovered by a post on the forum, you can do this today:

type baseProps = {"name": string} type props = { ...baseProps, label: string, } let label: props = { "name": "hello", "label": "label", } 

See playground

The compiler would not complain (tested with versions v11.0.0 to v11.1.1), type props here looks like a record type but is actually an object type.