Typing of get is missing the undefined as a possible return value

[Swissbite]

The Typings is assuming that the return value of get is always of the type stored in the database. But in fact, if a key is not set, then the return value is undefined.

So instead of

classic-level/index.d.ts

Lines 51 to 52 in 15eb289

	get (key: KDefault): Promise<VDefault>
	get<K = KDefault, V = VDefault> (key: K, options: GetOptions<K, V>): Promise<V>

I would suggest to adapt it to

  get (key: KDefault): Promise<VDefault | undefined>
  get<K = KDefault, V = VDefault> (key: K, options: GetOptions<K, V>): Promise<V | undefined>

[vweevers]

Agreed. We did that in abstract-level but forgot to copy it to here. PR welcome.