Imagine having a tuple in TypeScript like this:
type MyTuple = [string, number];
Now, the goal is to find the union of all numeric keys for this tuple, such as 0 | 1. This can be achieved using the following code snippet:
type MyKeys = Exclude<keyof MyTuple, keyof unknown[]>;
This will result in the type "0" | "1", which represents a union of string literals. However, is there a way to obtain a union of number literals instead?
After some research, I managed to uncover the answer. Take a look:
type MyArray = [number, number, string];
type IndexOfArray = Exclude<Partial<MyArray>['length'], MyArray['length']>;
// IndexOfArray = 0 | 2 | 1
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