The intermingling of two Generics can lead to an unexpectedly deep and potentially limitless Type instantiation

My experience with Typescript is still new, and I could use some guidance in resolving the error message 

Type instantiation is excessively deep and possibly infinite.(2589)

You can access the playground here.

To identify the error, uncomment the Type ExpandThrowAnError.

Context.

I have developed two Generics to assist me in defining APIs. Each object returned by an API may contain keys that can be expanded as needed during a request.

Therefore, the generic KeysCanBeExpanded helps retrieve all expandable keys on an object, while Expand allows for expanding the object based on specified keys.

Individually, these two Generics work smoothly, but upon merging them, the compiler raises an issue stating 

Type instantiation is excessively deep and possibly infinite.(2589)

typescriptrecursionoptimizationexpand

Answer №1

To find a solution, it is important to identify the types causing issues one step at a time:

Starting from:

type FindProblemTypes<T extends Base, K extends KeysToInvestigate<T, N> = never, N extends number = 4> = Investigate_<T, DivideIntoPossibleCombinations<K extends string ? K : '', '.'>, '', N, []>

Progressing to:

type SeekSolution<T extends Base, K extends KeysToInvestigate<T, N> extends infer R ? R : never = never, N extends number = 4> = Investigate_<T, DivideIntoPossibleCombinations<K extends string ? K : '', '.'> extends infer Ko ? Ko: '', '', N, []>

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