Define interface based on array type

Given:

const qualities = ["beauty", "cost", "upkeep"] as const
export type QualityStrings = (typeof qualities)[number]

I make use of QualityStrings outside, it cannot be discarded.

I also need an interface like the following:

export interface QualitiesInterface {
    beauty: number
    cost: number
    upkeep: number
}

as I’m implementing and extending the interface elsewhere.

But this is not DRY, I’m repeating myself. Would it be possible to define the same interface with mapped types?

export interface QualitiesInterface {
    [???]: number
} 

I can define those keys dynamically in a type but don’t know how to do the same for an interface:

type QualitiesType = {
    [V in QualityStrings]: number
}

>Solution :

What you need is Record<..., ...> I believe.

So, in this case it could be rewritten as:

export interface QualitiesInterface extends Record<QualityStrings, number> {}

Basically we’re ‘converting’ type to interface above with the use of extension semantics:

interface SomeThing extends MyType {
   // normal iface stuff can be added here if needed
}