add preview and writeFile options

[jhford]

This is to aid in local debugging as well as to make it possible to process a JSON schema file on the command line

[jhford]

not sure how this crept in, but i don't see it being a problem...

[jonasfj]

I can't see the danger of adding this... I still think it would be more appropriate to add this functionality in tc-lib-docs...

I quickly looked at tc-lib-docs, but it has a long list of problems... such as using streams without being streaming, and not supporting retries, we probably need to spend a little more time on tc-lib-docs..

@imbstack what do you think? Wouldn't it be easier to do this through tc-lib-docs?

[jonasfj]

I would like @imbstack thoughts...

I don't oppose the idea, just thinking it's better added in tc-lib-docs, when we want to remove publishing from tc-lib-validate/api/pulse-publisher

[jhford]

This is nothing to do with docs, this is a debugging tool for working on something which uses lib-validate. Since lib-validate and thus taskcluster use non-standard json-schema formats, it's really nice to have the lib-validate library be self-standing for anyone who wishes to interoperate with taskcluster without having to use lib-docs to do basic debugging.

[jonasfj]

Fair point... And yeah, I don't really see an danger in adding it to this library.