Fetching attributes of a class in TypeScript

I have successfully created a "load" function that takes JSON data and loads the attributes into properties of my class. As I am experimenting with typescript for the first time, I managed to resolve most errors but there are a few remaining challenges.

load(id): void{
  let item:object = this.items.find(item => item.id == id);
  if(typeof(item) != 'undefined'){
    for(let k in item){
      if(item.hasOwnProperty(k)){
        this[k] = item[k];
      }
    }
  }
}

The code snippet above leads to the following error:

    Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{}'.
    No index signature with a parameter of type 'string' was found on type '{}'.
    386 |       for(let k in item){
    387 |           if(item.hasOwnProperty(k)){
  > 388 |               this[k] = item[k];
        |                         ^
    389 |           }
    390 |       }
    391 |       }

How can I fix this issue? Is it related to the pattern I'm using, or should I declare the types differently to prevent the error from occurring?

Answer №1

This particular object type, though somewhat confusingly defined, does not have an index signature. As a result, you are unable to access or modify its values using bracket notation [].

To circumvent this limitation, you could declare let item:any, but be aware that this will disable any type checking.

Alternatively, you can define it as follows: let item: {[key: string]: any}. However, this is only marginally better in terms of usability.

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