Utility Types

Summary

Built-in generic helper types (`Partial`, `Pick`, `Omit`, `Record`, `Readonly`, etc.) that transform existing types without rewriting them from scratch.

• 1Use `Partial<T>` to model a form's in-progress (incomplete) state.
• 2Use `Pick<T, K>` and `Omit<T, K>` to derive smaller types from a larger one.
• 3Skim the full list of built-in utility types in the TypeScript Handbook once.