I am developing an Angular app. I use Typescript and have a certain class which contains the built-in Set and a Map types. My problem is that I want to store instances of my class in the browser's localStorage as JSON, but when I try to stringify them I get empty strings for these types.

Example from chrom's console:

> inst = new Object({
    'elem': new Set(),
    'str': 'somestring'
})
: Object {elem: Set(0), str: "somestring"}elem: Set(0)str: "somestring"}
> inst.elem.add('123');
: Set(1) {"123"}
> inst.elem.add('123');
: Set(1) {"123"}size: (...)__proto__: Set[[Entries]]: Array(1)0: "123"length: 1
> JSON.stringify(inst)
: "{"elem":{},"str":"somestring"}"

The only thing I could think of is recursively converting Sets and Maps to Arrays and Objects respectively before stringifying. But it sounds like much effort.

Is there a better way? Thanks.