ConditionalPickDeep does not work with deep interfaces

[ozum]

Hi,

If the deep property is an interface, ConditionalPickDeep does not pick the nested attribute.

Example:

type S = "SOME STRING";

interface B {
  b: S;
}

interface C {
  b: B;
  c: S;
}

type Test = ConditionalPickDeep<C, S>;

// Expected: type Test = { b: B, c: S }
// Actual: type Test = { c: S }

However the code below works as expected:

type S = "SOME STRING";

type B = {
  b: S;
}

interface C {
  b: B;
  c: S;
}

type Test = ConditionalPickDeep<C, S>;

// Expected: type Test = { b: B, c: S }
// Actual: type Test = { b: B, c: S }

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