CODEWITHSUNDEEP
typescript
Alexander Zeitler
Alexander Zeitler

Reputation: 13089

Type definition with dynamic properties

I'm getting data like this:

{
  "_embedded": {
    "Customers": [{ "CompanyName": "AWS" }]
  }
}

Another one might look like this:

{
  "_embedded": {
    "Products": [{ "SKU": "ABC123" }]
  }
}

So it's always the same structure except for the property name inside _embedded.

What I'm trying to achieve is to create a TypeScript type alias like this:

type MyType<T> = {
  _embedded: {
    Customers: Array<T>
  }
}

I can make the type being used in the array generic but I don't know if it's possible to make the name of the property in _embedded (Customer here) dependent on a string value.

Upvotes: 0

Views: 103

Answers (1)

Alexander Zeitler
Alexander Zeitler

Reputation: 13089

That's my solution based on kaya3's comment:

type MyType<T, K extends string> = {
  _embedded: Record<K, T>
}

It can be used like this:

const x: MyType<Array<Customer>>, 'customers'> = { 
  _embedded: { customers: [] }
}

Upvotes: 2

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