Function assertUnreachable

Used for exhaustive if/switch statements Example:

enum Fruit {
 orange = "orange",
 apple = "apple",
}

const getFruitName = (fruit: Fruit): string => {
 if (fruit === Fruit.orange) {
   return "Orange";
 }

 // Should fail TS compilation as Fruit.apple is not being handled in the code above
 return assertUnreachable(fruit);
}
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