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Literal Types

Literal types in TypeScript are a way to specify a value exactly, rather than just a type. Literal types can be used to enforce that a value must be of a specific type and a specific value. Literal types are created by using a literal value, such as a string, number, or boolean, as a type.

For example, the following is a literal type that represents a value of 42:

type Age = 42;

let age: Age = 42; // ok
let age: Age = 43; // error

In this example, the Age literal type is created by using the number 42 as a type. This type can then be used to enforce that a value must be of type number and have the value 42.

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