The issue of circular dependencies in TypeScript arises specifically within the Record type rather than in an ordinary object type

Can you explain the difference between two types, where one throws a TS error and the other does not?

type ScopeItem =
    | string
    | {
            all: string;
            team: string;
      };

type ScopesTree = Record<string, ScopeItem | Record<string, ScopesTree>>; // error: Type alias 'ScopesTree' circular references itself
type ScopesTree2 = Record<string, ScopeItem | { [key: string]: ScopesTree2 }>; // no error

https://i.sstatic.net/lziM6.png

Answer №1

This particular issue with Typescript is a constraint that should be overlooked for now.

Recommend using:

type ScopesTree2 = Record<string, ScopeItem | { [key: string]: ScopesTree2 }>; // to avoid errors
in your code rather than Record.

There has been some discussion on this matter and an ongoing issue raised.

Answer №2

It appears there might not be a distinct variance between the two scenarios; rather, it seems that your IDE is only highlighting one error in each instance. When you disable the type ScopesTree, the error may shift to the alternative type.

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