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Typescript Utility Readonly

Readonly

Constructs a type with all properties of Type set to readonly, meaning the properties of the constructed type cannot be reassigned.


interface Todo {
  title: string;
}

const todo: Readonly<Todo> = {
  title: "Delete inactive users",
};

todo.title = "Hello";

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Assigning a title to Todo Interface would throw an error .

Released:2.1

Reference: Official typescript docs

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