Immutable.js and Typescript

Question

I am creating an Application using react-redux. In that i am using typescript and immutable.js. When i use immutable methods like updateIn(), for a typed object, it is throwing error.

Following is the code which i tried:

interface aType{
  id: number
}

function randFun(a:aType){
  a = a.updateIn([....]); //It is throwing error in this line of code.
}
randFun({id:2});

Property 'updateIn' doesn't exist in on type {...}

How can i get rid of this error???

If you are going to use immutable js you have to give up using interfaces for your immutable objects so you would have to replace aType interface with Map interface in the immutable definition file — Kareem Mohamed
– Kareem Mohamed, Commented Jan 2, 2016 at 9:48
You may also check out github.com/engineforce/ImmutableAssign, which is a lightweight immutable helper that supports TypeScript type checking, and allows you to continue working with POJO (Plain Old JavaScript Object). — engineforce
– engineforce, Commented Jun 22, 2016 at 13:36

MartyIX · Accepted Answer · 2015-12-16 08:34:40Z

1

As for TypeScript, it's because updateIn is not defined in aType interface. To fix it, you can write:

interface aType{
  id: number,
  updateIn(n: number): aType
}

function randFun(a:aType){
  let n = 5;    
  a = a.updateIn(n); // No error here
}
randFun({id:2}); // This still need to be fixed!

However, it can't work in JavaScript too because you can't call updateIn on {id:2} object.

answered Dec 16, 2015 at 8:34

MartyIX

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3 Comments

Amala James Over a year ago

updateIn() is an immutable.js method as i mention in the question.

MartyIX Over a year ago

Do you use definition file github.com/facebook/immutable-js/blob/master/type-definitions/… for immutable.js?

Amala James Over a year ago

Yeah i used definition file

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