You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: interpolation.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/sass-3.4.24/lib/sass/script/tree
    
    the code of the file until where you have to start completion: module Sass::Script::Tree
  # A SassScript object representing `#{}` interpolation outside a string.
  #
  # @see StringInterpolation
  class Interpolation < Node
    # @return [Node] The SassScript before the 
    
    def to_sass(opts = {})
      return to_quoted_equivalent.to_sass if deprecation == :immediate

      res = ""
      res << @before.to_sass(opts) if @before
      res << ' ' if @before && @whitespace_before
      res << '#{' unless @originally_text
      res << @mid.to_sass(opts)
      res << '}' unless @originally_text
      res << ' ' if @after && @whitespace_after
      res << @after.to_sass(opts) if @after
      res
    end