YAML Support

[mozey]

"The YAML 1.2 specification was published in 2009. Its primary focus was making YAML a strict superset of JSON." See 1.2.2 spec

YAML files take precedence, e.g.

• Try to read config.dev.yaml
• If above doesn't exist, try to read config.dev.json
• Error if neither file exists

This feature would be useful for adding comments to config files. Config files must still be flat key value pairs

[mozey]

Also consider this https://stackoverflow.com/a/3104376/639133

Suppose you are using JSON to keep configuration files, which you would like to annotate. Go ahead and insert all the comments you like. Then pipe it through JSMin before handing it to your JSON parser. - Douglas Crockford, 2012

Practically speaking, maybe json5 would be useful, as opposed to e.g. config.dev.js? So the precedence would be

• Try to read config.dev.yaml
• If above doesn't exist, try to read config.dev.json5
• If above doesn't exist, try to read config.dev.json
• Error if neither files exists
• Error if more than one file exists, to avoid confusing the user?

[mozey]

getConfigFilePaths method defines the load precedence

[mozey]

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