When I establish a type in the following way:
type O = { [k: string]: any };
I assume that the keys in O will be limited to the type string. However, if I create:
type KO = keyof O;
KO ends up being string|number. Why is this the case? Even though I specifically narrowed the keys of O to be strings by declaring [k:string], why does KO include numbers as well?
When dealing with a string index, it's important to note that you also have access to the number indexer. This concept is clearly explained in the documentation:
If your type includes a
stringindex signature, thekeyof Twill encompass bothstringandnumber(not just string alone, as JavaScript allows you to retrieve object properties using eitherstrings(object['42']) ornumbers(object[42])).
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