'Remove all optional items from a Tuple type
Let say I want to turn a tuple with optional items like [1, 2, 3?, 4?] to an array containing only the required items -> [1, 2]
What i've come up with as shown below it to turn to never all optional items, and I'm stuck here.
type OnlyReq <L extends any []> = {
[K in keyof L]-?: L [K] extends Required <L> [K] ? L [K] : never
}
type Found = OnlyReq <[1, 2, 3?, 4?]> // [1, 2, never, never]
Sources
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