Friendly error message when jsb file parsing fails.

require 'optparse'

require 'jsduck/meta_tag_registry'

require 'jsduck/logger'

require 'jsduck/io'

require 'jsduck/json_duck'

module JsDuck

    # Extracts files of first build in jsb file

    def extract_jsb_files(jsb_file)

      json = JSON.parse(JsDuck::IO.read(jsb_file))

      json = JsonDuck::read(jsb_file)

      basedir = File.dirname(jsb_file)

      return json["builds"][0]["packages"].map do |package_id|