feat(types): Add utility types

Signed-off-by: Drew Hoener <[email protected]>

Author: drewhoener

src/types/interface-types.ts

@@ -0,0 +1,16 @@
+/**
+ * Represents a type that can either be a value of type `T` or `undefined`.
+ */
+export type Optional<T> = T | undefined;
+
+/**
+ * Represents a type that can either be a value of type `T` or `null`.
+ */
+export type Nullable<T> = T | null;
+
+/**
+ * Represents an object type where all properties are optional, and included properties can be null or undefined.
+ */
+export type PartialNullable<T> = {
+  [P in keyof T]?: Nullable<T[P]>;
+};