import { type DeepUndefinable } from "https://deno.land/x/ts_essentials@v9.1.2/lib/mod.ts";
Recursive undefinable
definition: T extends Builtin ? T | undefined : T extends Map<infer K, infer V> ? Map<DeepUndefinable<K>, DeepUndefinable<V>> : T extends ReadonlyMap<infer K, infer V> ? ReadonlyMap<DeepUndefinable<K>, DeepUndefinable<V>> : T extends WeakMap<infer K, infer V> ? WeakMap<DeepUndefinable<K>, DeepUndefinable<V>> : T extends Set<infer U> ? Set<DeepUndefinable<U>> : T extends ReadonlySet<infer U> ? ReadonlySet<DeepUndefinable<U>> : T extends WeakSet<infer U> ? WeakSet<DeepUndefinable<U>> : T extends Array<infer U> ? T extends IsTuple<T> ? [K in keyof T]: DeepUndefinable<T[K]> | undefined : Array<DeepUndefinable<U>> : T extends Promise<infer U> ? Promise<DeepUndefinable<U>> : T extends { } ? [K in keyof T]: DeepUndefinable<T[K]> : T | undefined