The Primitive Type never
In this lesson, you will see the type never, which is used to indicate that something must never happen.
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The type never means that nothing occurs. It is used when a type guard cannot occur or in a situation where an exception is always thrown. There is a difference between void and never. A function that has the explicit return type of never won’t allow your code to return undefined, which is different from a void function that allows code to return undefined.
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function functionThrow(): never {throw new Error("This function return never");}
The never type is a subtype for every type. Hence, you can return never ...