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node.js - Parse function, and generics type guards

i am making a ts module for myself, and I need a bit of help to make a function that parses & maps a list of strings to an object. This should be pretty easy, but what I wanted to do was to extend with typescript functionality and have it return a type. For this I used generics. My question is how do I type validate the object created to the interface, since I have to idea what keys there will be in the object & i have no clue what the types of those keys will be?

Update

async function parse<T extends GenericArg>(args: string[], keys: Array<keyof T>):Promise<T> {

var obj:T & any = {Other: ""}
//does the whole transformation, using the keys argument, and the args 
// argument for the array of strings that are actually maped

// here I need to do something to validate that the obj is conforming to type T

return obj

}

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