Function assertIsFunction

assertIsFunction(
input: unknown,
error?: string | Error,
): asserts input is Function
Assert that input is a function.
Parameters
- input: unknown
- error: string | Error = 'input is not a function'
Returns asserts input is Function
Example
```
assertIsFunction(() => {}); // does not throw
assertIsFunction(42); // throws TypeError: input is not a function
```
- Defined in src/assertion/assertIsFunction.ts:14