Support --inspect-brk on command-line

[igwejk]

There's already a support for --inspect option. This extends that support for the option, --inspect-brk.

[coveralls]

Coverage increased (+2.2%) to 88.188% when pulling 038c636 on igwejk:support_inspect_break_in_opts into b4ebabd on mochajs:master.

[ORESoftware]

Just curious, what's the difference between

--inspect-brk and --inspect --debug-brk

is that the same?

[igwejk]

On --inspect and --inspect-brk, citing Node.js v7.9.0 Documentation:

V8 Inspector integration allows attaching Chrome DevTools to Node.js instances for debugging and profiling. It uses the Chrome Debugging Protocol.

V8 Inspector can be enabled by passing the --inspect flag when starting a Node.js application. It is also possible to supply a custom port with that flag, e.g. --inspect=9222 will accept DevTools connections on port 9222.

To break on the first line of the application code, pass the --inspect-brk flag instead of --inspect.

Here the same documentation states the following about the debug option:

The debug protocol used by the --debug flag was removed from V8.

In the general deprecated section of the documentation, the --debug feature is defined as

--debug activates the legacy V8 debugger interface, which has been removed as of V8 5.8. It is replaced by Inspector which is activated with --inspect instead.

Summary
--debug and --inspect enable similar features for the enduser, except that either of them use different protocols to deliver their functionality and that the --debug option has been marked for deprecation by Node.

Both --debug and --inspect have an associated --debug-brk and --inspect-brk which enables the debugger to break on the first line and allows you an opportunity to attach an external debugger to your application's node process.

/cc @ORESoftware

[ScottFreeCode]

This looks good to me; @mochajs/core do we have anything that needs to be done before merging in updates to Node CLI flags?

[dasilvacontin]

@ScottFreeCode nothing extra afaik.

[ScottFreeCode]

Thanks for the update!

[dasilvacontin]

This enhancement has been released in v3.3.0! 🎉