Function assertIsOptionalBoolean

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