TYPESCRIPT

typescript add object to object

//Alternatively you can mark these properties as optional:

interface IFoo{
    bar?:string;
    baz?:string;
    boo?:string;    
}

// Now your simple initialization works
var foo:IFoo = {};

typescript add object to object

interface MyType extends Record<string,any> {
    typesafeProp1?: number,
    requiredProp1: string,
}

/**
Record<Keys,Type> is a Utility type in typescript.
It is a much cleaner alternative for key-value pairs 
where property-names are not known. 
It's worth noting that Record<Keys,Type> is a named alias to {[k: Keys]: Type} 
where Keys and Type are generics.
*/