Typescript change object property values dynamically error

Question

I'm trying to dynamically change object property values based on the property type, e.g., replace all object string properties with "***". I keep getting Type '"***"' is not assignable to type 'T[keyof T]'

I've tried finding the correct way of doing this in Typescript GitHub repository but no luck.

I'm using the latest version of Typescript as of writing this "3.8.2".

Anyone knows what is the correct way of changing object property values when accessing properties dynamically?

Example:

interface IClassA {
    name: string;
    age: number;
}

const user: IClassA = {
    name: "Jhon Doe",
    age: 20
};

obfuscate(user);

export function obfuscate<T extends IClassA>(obj: T) {
    for (const prop of Reflect.ownKeys(obj) as (keyof T)[]) {
        if (typeof obj[prop] === "string") {
            obj[prop] = "***";
        }
    }
}

using keyof T is saying that the value of prop will be string, number, or Symbol, AKA: obj['number'] and not obj['name']. — Get Off My Lawn
– Get Off My Lawn, Commented Feb 26, 2020 at 16:13

Abderrahim Soubai-Elidrisi · Accepted Answer · 2020-02-26 16:08:57Z

1

I don't know why doing this but the simplest (dirty) hack to do this is casting you text to any :

if (typeof obj[prop] === "string") {
            obj[prop] = ("***" as any);
}

answered Feb 26, 2020 at 16:08

Abderrahim Soubai-Elidrisi

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