Having a hard time understanding how to add a custom interface as a member to one of my models

[Tsury]

I'm new to mobx-keystone and didn't manage to find an answer to my (basic) question:

Suppose I have this model:

class MyModel extends Model({
  someNumber: tProp(types.number, 0).withSetter()
}) {}

Suppose I have this interface:

interface MyInterface {
  someData: string;
  someOtherData: boolean;
}

How can I add a new member to my model, called someMyInterface (I also need it to be optional but I digress)?

Only way I managed was either:
someMyInterface: tProp(types.unchecked<PlayerHeroSwap>()).withSetter(),
Which bails me out of the type check,

Or:
someMyInterface: tProp(types.object(() => ({ someData: types.string, someOtherData: types.boolean })))
Which bypasses the interface altogether, which is undesired.

[xaviergonz]

The first way you used is valid.
A faster way to do it skipping the runtime type checking is:

someMyInterface: prop<MyInterface>().withSetter()

if you want runtime type checking then an interface is not enough, you need to tell the runtime how it should be type checked (which is what types.object is actually doing)

[Tsury]

Got it, thank you for the clarification!