Debug SocketCluster in VS Code

What's wrong?

Visual Studio Code doesn't respect breakpoints in child processes, such as workers and brokers, scworkercluster and sc-broker-cluster, when I try to debug SocketCluster with VS Code's internal debugger.

How could it be fixed?

We could change a couple of lines of code, a line in socketcluster and a line in sc-broker

from

execOptions.execArgv.push('--inspect=' + inspectPort);

to

execOptions.execArgv.push('--inspect-brk=' + inspectPort);

and breakpoints will work as expected.

What do I propose?

To add a couple of new CLI arguments.
--inspect-brk-workers and
--inspect-brk-brokers

Checklist

• The new CLI arguments should accept the same options as the original --inspect-brk

--inspect-brk-workers
--inspect-brk-workers=port
--inspect-brk-workers=host:port

--inspect-brk-brokers
--inspect-brk-brokers=port
--inspect-brk-brokers=host:port

• The type signature of --inspect-workers and --inspect-brokers CLI arguments should be updated as well, to comply with the original --inspect

--inspect-workers
--inspect-workers=port
--inspect-workers=host:port

--inspect-brokers
--inspect-brokers=port
--inspect-brokers=host:port

• The docs should be updated

• An example .vscode/launch.json configuration should be added to the SocketCluster sample app

• The new CLI arguments should fix socketcluster#510

Start with the linked lines in socketcluster/index.js and sc-broker/index.js, then trace the existing --inspect-workers and --inspect-brokers argument handling. Check the debugging documentation and the sample app's .vscode/launch.json for the required updates. Done means the new arguments accept the listed forms, the existing argument signatures are updated, the docs and example are present, and socketcluster#510 is fixed.