feat: support src/command/index cmd

[RasPhilCo]

No description provided.

[codecov]

Codecov Report

Merging #141 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #141   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           1       1           
  Lines          10      10           
  Branches        2       2           
======================================
  Misses         10      10           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 07bcfaa...2298b69. Read the comment docs.

[G-Rath]

@chadian @RasPhilCo just FYI this is a very breaking change, that I don't really understand at all nor know how I can work around, in part because there's no issue, description, changelog entry, etc.

[RasPhilCo]

@G-Rath I backtested this before merging, what breaks?

[RasPhilCo]

Ref oclif/oclif#277 (comment)

[G-Rath]

At the time of posting I was very swamped with work, so while the problem is obvious to me now, it wasn't at the time.

Basically, this change means that if there's an index.js/ts file it's assumed to be the default command to run - I think on paper this is a reasonable implementation for the feature of having a "default command", but it's assuming you've not already got such a file which I do.

I'm using index.ts as a barral export to allow me to import commands as import { MyCommand } from '@src/commands' - this means this change is breaking for my project as it takes the first command being exported and uses that as the default command.