Mobx-state-tree: Using mst model structure as a type

[naorzr]

I have:

• [V] A conceptual question.
  
  
  
  • [V] I've checked documentation and searched for existing issues
  
  
  • [ V] I tried the spectrum channel first
  
  

Hey,
Lets assume i have a an "EventModel" and i wish to use this model as a type outside the scope of mst and inside a function of some sort with typescript. is there a way of doing it without typing an identical interface to eventModel?

for further clarification, if i have a model as follow

const A = types.model(
a: types.string,
b: types.number
)

is there a way to generate the identical copy of a none mst model
as follow from the mst model

interface B{
a: string,
b: number
}

[xaviergonz]

interface B extends Instance<typeof A> {}
where instance has to be imported from mobx-state-tree

[zmayor]

@xaviergonz Is there any possibility to transform interfaces to mst models? In other word, can I define a mst model with interface but mst types?

[xaviergonz]

you'd need to create a tool that uses the typescript parser to parse the abstract tree of the interface and then generate a js file that generates the appropriate mst code out of it

[xaviergonz]

actually that could be a cool idea for a typescript transformer, but still you'd loose optional defaults

[zmayor]

I met some trouble when I was trying to transform type into interface, can you tell me what's wrong?
This is the codesandbox, please look at the schema.ts.

[xaviergonz]

that's because the object your are declaring is actually a SnapshotOut, not an Instance

[xaviergonz]

in the docs there are more details about the differences between SnapshotIn, SnapshotOut and Instance

[xaviergonz]

https://github.com/mobxjs/mobx-state-tree/blob/master/README.md#using-a-mst-type-at-design-time

[naorzr]

thanks for the help

[xaviergonz]

no problem 😁