Is it possible to create a type guard in JavaScript that checks if a given type implements an index signature? I'm unsure if this concept would be viable, but here is the idea:
I am looking for guidance on how to implement the logic within this function:
function hasIndexSignature(o: complexunioninterface | { [index: string]: string }): o is { [index: string]: string } {
return /* Help? */;
}
Since many types are objects, would a correct implementation simply check if the variable is of type object like this:
function hasIndexSignature(o: complexunioninterface | { [index: string]: string }): o is { [index: string]: string } {
return typeof o === "object";
}
One approach could involve creating a type guard for complexunioninterface and then negating it. However, I am curious to know if defining a type guard specifically for index signatures is feasible and practical.