What is the type signature of the main exported function?

The main exported function getPort has the following type signature:

export default function getPort(options?: Options): Promise<number>;

[index.d.ts:L66]

This function returns a Promise that resolves to a number representing an available TCP port. The options parameter is optional and of type Options, which allows you to specify preferences like:

• port: a preferred port number or iterable of port numbers
• exclude: ports to skip
• reserve: whether to lock the port for the process lifetime
• host: a specific host to check availability on

FOLLOW_UPS:

• What properties does the Options interface include?
• How does the function handle unavailable preferred ports?
• What does the reserve option do exactly?