How to pass a function argument, for a complex object?

Question

typescript

There is a complex object

const obj:DataType = {
  val0:boolean,
  val1:string,
  val2:null | undefined | string
  val3: {
    field0:[string, string]
    field1: {
      word:string
    },
  val4:[
    {text0: true, text2:{}}
  ]  
  }
}

I want to write a function that will change values ​​by key. Something like this

function changeField(data:DataType, fieldName:keyof DataType, val:any) {
  data[fieldName] = val
}

But at the time of assignment I get an error the type any cannot be assigned to the type never
I understand that this error is just related to the fact that val has type any
Please tell me if there is any relatively simple solution?

Answer 1

function changeField<T extends DataType, K extends keyof T>(data:T, fieldName:K, val: T[K]) {
  data[fieldName] = val
}