如何检查typescript中的变量类型

Question

I have a JS object of type any and i want to check its content and get value in correct type so i imagined a function like this

function getRequiredField<T>(config: any, name: string): T {
    if (config[name] === undefined) throw new Error(`Required field ${name} is missing`);
    return config[name] as T;
}

And its working as i want, but now i would like to check the typeof config[name] and be sure it is the same as T. How can i do this?

Thanks for your help.

Answer 1

You can use instanceof operator to check if it's type instance of T or not.

config[name] instanceof Sprite;

This will return Boolean primary type value.