All TILs

`Partial<T>` makes all type properties optional for flexible object handling.

`Omit<T, K>` removes properties `K` from `T` using `Pick` and `Exclude`.

In cases where type narrowing is needed for a union type, explicitly declare the return type.

Union types can be handled more safely using type guards.

Duplicate types can be grouped into a common interface and extended using 'extends'.