Use next available port instead of hardcoded as default when using `run` command

[achou11]

Running webxdc-dev run ... without using the --port flag results in the following error on my machine:

Error: listen EADDRINUSE: address already in use :::7000

Looks like this comment didn't age too well 😅 :

https://github.com/webxdc/webxdc-dev/blob/0b9fafed598f0e8cb7a6d20e40991d40187a5bdd/CHANGELOG.md#L295

Instead of a hardcoded port as the default, I would suggest using a module like https://github.com/sindresorhus/get-port to get the next available port if the preferred one isn't available.

[ralphtheninja]

@achou11 Any alternative to get-port available that does the same? This is opening a can of worms because $reasons.

[ralphtheninja]

$reasons

So TypeScript is configured to build commonjs:

Which results in the following built javascript:

I.e. using import in the TypeScript really result in doing the good ole require. Buuuuut get-port doesn't allow you to do that since it's a es6 module. So it would be easier if there was a good ole require module doing the same.

Yes, I have tried changing tsconfig-backend.json as well to produce something else than commonjs but then you run into other issues. It just doesn't stop :)

[ralphtheninja]

Looks like @davidmarkclements has done a version of it here https://github.com/davidmarkclements/get-port/blob/master/index.js

EDIT: Nope, this isn't the code. It does something else and the repository is even gone from github :/

[achou11]

@ralphtheninja if trying to get a closest match to a preferred port isn't a requirement, pretty sure you can let Express use Node's default behavior of choosing a random available port by specifying 0.

Docs from Express v4 listen() method:

If port is omitted or is 0, the operating system will assign an arbitrary unused port, which is useful for cases like automated tasks (tests, etc.).

[ralphtheninja]

@ralphtheninja if trying to get a closest match to a preferred port isn't a requirement, pretty sure you can let Express use Node's default behavior of choosing a random available port by specifying 0.

I found detect-port and it works really well, see #69