Pattern for defining objects with indexes in Typescript

My data is structured as shown below:

let equipment:Equipment =  {
  "1": {
    "name": "abc",
    "data": 123
  },
  "2": {
    "name": "def",
    "data": 234
  },
  "3": {
    "name": "ghi",
    "data": 345
  },
  ...
}

Converting this into an array seems straightforward, but since my equipment ID's start with 1, I'd prefer not to deal with the logic of excluding the [0] element (which would be null).

To address this, I have created the TypeScript Declaration Files below.

interface Equipment 
{ 
  [ k: number ]: EquipmentBase;
}

interface EquipmentBase 
{
  name: string
  data: number
}

Furthermore, when I return this equipment object alongside others, I need to place it in a JSON object, requiring yet another interface declaration.

interface EquipmentObj
{
  equipment: Equipment
}

/* returns {equipment: 
  {
  "1": {
    "name": "abc",
    "data": 123
  },
  "2": {
    "name": "def",
    "data": 234
  },
  "3": {
    "name": "ghi",
    "data": 345
  },
  ...
  }
}

*/

It seems like a lot of declarations (Equipment, EquipmentObj) are needed just to define an object that stores data. Is there a more efficient way to reduce the number of declarations I'm using?

Answer №1

If you want to achieve this functionality, you can follow the structure below:

interface EquipmentObj
{
  equipment: {
    [k: number]: {
      name: string
      data: number
    }
  }
}

However, keep in mind that by doing this, you won't be able to declare anything as one of the inner types anymore.

Therefore, if you need to specify a variable, parameter, or return type as Equipment or EquipmentBase, you will not be able to include that in the current structure.

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