Function assertIsOptionalNull

assertIsOptionalNull(
input: unknown,
error?: string | Error,
): asserts input is null | undefined
Assert that input is null or undefined.
Parameters
- input: unknown
- error: string | Error = 'input is not an optional null'
Returns asserts input is null | undefined
Example
```
assertIsOptionalNull(null); // does not throw
assertIsOptionalNull(undefined); // does not throw
assertIsOptionalNull(0); // throws TypeError: input is not an optional null
```
- Defined in src/assertion/assertIsOptionalNull.ts:15