Function unreachable

unreachable(value: never): never
Asserts that a code path is unreachable; throws if executed.

Use for exhaustiveness checking in switch statements. TypeScript will error if all cases aren't handled.
Parameters
- value: never
  Should be never if all cases are handled.
Returns never
Throws
Always throws with the unexpected value.
Example
```
type Fruit = 'apple' | 'banana';

function getColor(fruit: Fruit): string {
    switch (fruit) {
        case 'apple': return 'red';
        case 'banana': return 'yellow';
    }
    return unreachable(fruit); // Compile error if case missing
}
```
- Defined in src/function/unreachable.ts:23