Guide on restricting object keys to a specific set of strings in typescript

I am dealing with an API that has the ability to return one of these options:

{ fill: 'string'} or {stroke: 'string'} or {effect: 'string'}

The key type I have established is as follows:

type StyleKeyType =
  | 'fill'
  | 'stroke'
  | 'effect';

Now, in order to create a type for the object, I attempted the following:

type StylesObject = { [K in StyleKeyType]?: string };

However, this approach fails because it considers {} as valid when it should not be in my scenario.

Is there a method to generate this type without having to manually list out each possible object type?

Answer №1

{} is considered valid since all properties of StylesObject have been denoted as optional using the symbol ?.

Below is a suitable solution that may meet your requirements:

type StylesObject = {
  [key in StyleKeyType]: Record<key, string>
}[StyleKeyType];

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