TL;DR
type RecursiveTypeNode<T> = Record<string, T | null>;
interface RecursieveType extends RecursiveTypeNode<RecursieveType> {}
I needed to create a type for a recursive structure like this:
const template = {
'Page 1': {
'Page 1 1': {
'Page 1 1 1': {
'Page 1 1 1 1': null,
'Page 1 1 1 2': null,
},
'Page 1 1 2': null,
},
'Page 1 2': null,
'Page 1 3': null,
},
'Page 2': {
'Page 2 1': null,
'Page 2 2': null,
},
'Page 3': null,
};
This is a collection of pages; every page is either a collection of pages or null. My first thought was to simply write this:
type RecursieveType = Record<string, RecursieveType | null>
Does not work, TypeScript says:
TS2456: Type alias RecursieveType circularly references itself.
It turned out that type aliases can not be recursive, but interfaces can. See the solution above.
