Typescript Utility Partial

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Partial

Constructs a type with all properties of Type set to optional. This utility will return a type that represents all subsets of a given type.

example

interface Todo {
  title: string;
  description: string;
}

function updateTodo(todo: Todo, fieldsToUpdate: Partial<Todo>) {
  return { ...todo, ...fieldsToUpdate };
}

const todo1 = {
  title: "organize desk",
  description: "clear clutter",
};

const todo2 = updateTodo(todo1, {
  description: "throw out trash",
})

Released:
2.1

Reference :Typescript official docs