Objects

type UserObject = {
    name:string;
    age:number;
    favoriteColor:string;
}

OR

interface UserObject{
	name:string;
	age:number;
	favoriteColor:string;
}

Creating an object type is straightforward. The syntax is virtually identical to creating an object. You can then just apply this type to an object you create and typescript will make sure all of those values inside are correctly typed:

let myObject:UserObject = {
    name:"hello",
    age:20,
    favoriteColor:"red"
}

If you were to change to a string you'd get a Typescript Error. You would also get a Typescript Error if you added any new keys to the object that weren't defined in the type- or if you didn't include all the keys:

let myObject:UserObject = {
    name:"hello",
    age:20,
    favoriteColor:"red",
    id:2, //error
}
// or
let myObject:UserObject = { // error
    name:"hello",
    favoriteColor:"red",
}

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