# Function: ensureUnreachable()

> **ensureUnreachable**(`value`, `message?`): `never`

Defined in: [helpers/ensure.ts:29](https://github.com/coda/packs-sdk/blob/b2b4c9dba5ca748bdbb94481cc13b5ca3c328ef6/helpers/ensure.ts#L29)

Helper for TypeScript to make sure that handling of code forks is exhaustive, most commonly with a `switch` statement.

## Example

```
enum MyEnum {
  Foo = 'Foo',
  Bar = 'Bar',
}

function handleEnum(value: MyEnum) {
  switch(value) {
    case MyEnum.Foo:
      return 'foo';
    case MyEnum.Bar:
      return 'bar';
    default:
      // This code is unreachable since the two cases above are exhaustive.
      // However, if a third value were added to MyEnum, TypeScript would flag
      // an error at this line, informing you that you need to update this piece of code.
      return ensureUnreachable(value);
  }
}
```

## Parameters

| Parameter | Type | | --- | --- | | `value` | `never` | | `message?` | `string` |

## Returns

`never`