module Sprockets::Rails::Helper

def asset_integrity(path, options = {})

Returns String integrity attribute or nil if no asset was found.

options - Hash options
path - String path

Experimental: Get integrity for asset path.
def asset_integrity(path, options = {})
  path = path_with_extname(path, options)
  resolve_asset do |resolver|
    resolver.integrity path
  end
end