Consider supporting YAML for hydra configs

[cjus]

This might be useful.
https://www.npmjs.com/package/node-yaml

[sjmcdowall]

I see PR#166 in theory handles this Issue .. but nothing on the PR request has happened??

[cjus]

The issue I raised privately (@taurenk and I work together) is that of adding another dependency. At one point I was on a crusade to slim Hydra (core) in size. My reason was that I wanted us to be able to claim that Hydra is a light-weight library.

I routinely use cost-of-modules to check on size.

$ npm install -g cost-of-modules
/Users/cjustiniano/.nvm/versions/node/v8.9.4/bin/cost-of-modules -> /Users/cjustiniano/.nvm/versions/node/v8.9.4/lib/node_modules/cost-of-modules/lib/index.js
+ cost-of-modules@1.0.1
added 16 packages in 1.677s

$ cost-of-modules

Making sure dependencies are installed
npm install --production

up to date in 2.044s

Calculating...


┌──────────────┬────────────┬───────┐
│ name         │ children   │ size  │
├──────────────┼────────────┼───────┤
│ bluebird     │ 0          │ 0.59M │
├──────────────┼────────────┼───────┤
│ redis        │ 3          │ 0.26M │
├──────────────┼────────────┼───────┤
│ redis-url    │ 1          │ 0.17M │
├──────────────┼────────────┼───────┤
│ debug        │ 1          │ 0.06M │
├──────────────┼────────────┼───────┤
│ route-parser │ 0          │ 0.05M │
├──────────────┼────────────┼───────┤
│ umf          │ 0          │ 0.03M │
├──────────────┼────────────┼───────┤
│ uuid         │ 0          │ 0.02M │
├──────────────┼────────────┼───────┤
│ 7 modules    │ 4 children │ 1.01M │
└──────────────┴────────────┴───────┘

One way to support this might be to build a HydraPlugin (https://github.com/flywheelsports/hydra/blob/master/plugins.md) that adds yaml to json conversion.

The following are examples of HydraPlugins:

• https://github.com/ecwyne/hydra-plugin-rpc
• https://github.com/jkyberneees/hydra-plugin-http
• https://www.npmjs.com/package/hydra-event-bus-plugin

[sjmcdowall]

Personally I don't have a "dog in this hunt" as it were -- I'm a TOML fan :) The reason I bring this up though is because for those looking from the outside -- seeing "old" PR requests apparently "ignored" is not a good sign for an Open Source project. The goal should be to merge or reject PR's ASAP .. and not leave them lingering .. But that's my opinion ..

[cjus]

@sjmcdowall thanks for the feedback. I've asked @taurenk to review here.