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User mentioned (1): @jcals
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Trying to solve the problem with possible to pass not all needed keys for create class instance, mentioned by @jcals, I think I need custom class which constructor takes only object of corresponds keys, value type:

function getEntries<
  T extends Record<PropertyKey, unknown>,
  K extends keyof T,
  V extends T[K]>(o: T) {
    return Object.entries(o) as [K, V][]
}

interface T_Dict<K extends PropertyKey, V> extends ReadonlyMap<K, V> {get(key: K): V}

export class DictObject<K extends PropertyKey, V> extends Map<K, V> implements T_Dict<K, V>{
  constructor(obj: Record<K, V>) {
    super(getEntries(obj))
  }

  public override get(key: K): V {
    if (!this.has(key)) throw new Error('Wrong key!')
    return this.get(key)
  }
}

But I cant force it to produce instanse of ReaadOnlyMap - it's still has method like delete/clear (

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