What strategies can I implement to prevent circular references within type aliases?

Dealing with an array that contains elements which can either be arrays themselves (recursively) or strings has proven to be a bit tricky. My attempt to create a type definition for this has resulted in the compiler flagging it as a circular reference.

So, my question is: How do I go about creating a type alias that can handle this scenario without running into issues related to circular referencing?

type Foo = Array<Foo | string>

The challenge I am facing has been discussed on Stack Overflow: Type alias circularly references itself. However, the solutions provided there have not fully addressed my specific problem.

Answer №1

Type aliases in TypeScript do not support recursion, with the exception of property-level recursion demonstrated in examples provided in the official documentation.

To work around this limitation, it is suggested in this GitHub issue that you use an interface instead. Interfaces allow for the definition of recursive structures, such as:

interface Foo extends Array<Foo | string> { }

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