fix: Fixed undefined and never error#1
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Fixes the following error: Line 12: `Not all code paths return a value.` Fixed by adding the type for the return value of area function.
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Fixes the following errors:
Line 4:
Argument of type 'T' is not assignable to parameter of type 'never'.Fixed by adding the type to data.
Line 5:
Type 'undefined' is not assignable to type 'T'.'T' could be instantiated with an arbitrary type which could be unrelated to 'undefined'.Fixed by adding an exclamation mark to the return value of pop. It signifies that the value cannot be null or undefined.