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const min = 1024;const max = 65535;
export type checkedPort = {	valid: boolean;	port: number}
/** * Try run listener to check if port is open. * @param {Deno.ListenOptions?} options * @return {checkedPort} */function checkPort(options: Deno.ListenOptions): checkedPort {	const { port } = options;	try {		const server = Deno.listen(options);		server.close();		return { valid: true, port: port };	} catch (e) {		if (e.name !== 'AddrInUse') throw e;		else return { valid: false, port: port};	}}
/** * Create an array of number by min and max. * @param {number} from Must be between 1024 and 65535 * @param {number} to Must be between 1024 and 65535 and greater than from * @return {number[]} */function makeRange(from: number, to: number): number[] {	if (!(from > min || from < max)) throw new RangeError('`from` must be between 1024 and 65535');	if (!(to > min || to < max)) throw new RangeError('`to` must be between 1024 and 65536');	if (!(to > from)) throw new RangeError('`to` must be greater than or equal to `from`');	var ports = [];	for (let port = from; port <= to; port++) ports.push(port);	return ports;}
/** * Return a random port between 1024 and 65535. * @param {string?} hostname * @return {number} */function randomPort(hostname?: string): number {  const port = Math.ceil(Math.random() * ((max-1) - min+1) + min+1);  const result: checkedPort = checkPort({ hostname, port});  if (result.valid) return result.port;  else return randomPort(hostname);}
/** * Return available port. * @param {number | number[]} port * @param {string?} hostname * @return {number} */ export default function getPort (port?: number | number[], hostname?: string): number {	const listenOptions: Deno.ListenOptions = {		hostname: hostname || '0.0.0.0',		port: (port && !Array.isArray(port)) ? port : 0	}
	if (!port || Array.isArray(port)) {		const ports: number[] = (Array.isArray(port))? port : makeRange(min+1, max-1);		for (const port of ports) {			const result: checkedPort = checkPort({...listenOptions, port});			if (result.valid) return result.port;		}		return getPort(ports[ports.length-1]);	} else {		const result: checkedPort = checkPort(listenOptions);		if (!result.valid) {			const range = makeRange(result.port + 1, max-1);			return getPort(range);		} else return result.port;	}}
export { min, max, getPort, randomPort, makeRange }