optics-ts is a TypeScript library that provides type-safe, ergonomic, and polymorphic optics for manipulating deeply nested data structures immutably. It supports lenses, prisms, and traversals, allowing users to read, modify, and update values while maintaining type safety and enabling data type changes during operations. This library is ideal for TypeScript developers working with complex, nested data who need a type-safe and ergonomic way to perform immutable updates.