Opal, Rails asset preprocessor and Style/LeadingCommentSpace

[lloeki]

Rails (or is that Sprockets?) asset pipeline uses a comment sign followed by = (hence #= in our case) in the first comment block of a file to include preprocessor directives in asset files. This conflicts with Rubocop in Opal files, making the following workaround mandatory:

# rubocop:disable Style/LeadingCommentSpace
#= require_tree ../templates/bootstrap
# rubocop:enable Style/LeadingCommentSpace

Could it be possible to make Style/LeadingCommentSpace smarter?

[bbatsov]

We can allow #= I guess. Not sure if there are better/smarter alternatives.