lib/opal/builder_scheduler/prefork.rb in opal-1.7.1 vs lib/opal/builder_scheduler/prefork.rb in opal-1.7.2

@@ -250,12 +250,13 @@
         first = rel_path
         queue = requires.map { |i| [rel_path, i, autoloads, options] }
 
         awaiting = 0
         built = 0
+        should_log = $stderr.tty? && !ENV['OPAL_DISABLE_PREFORK_LOGS']
 
-        $stderr.print "\r\e[K" if $stderr.tty?
+        $stderr.print "\r\e[K" if should_log
 
         loop do
           events, idles = @forks.get_events(queue.length)
 
           idles.each do |io|
@@ -294,21 +295,21 @@
             when :close
               io.goodbye
             end
           end
 
-          if $stderr.tty?
+          if should_log
             percent = (100.0 * built / (awaiting + built)).round(1)
             str = format("[opal/builder] Building %<first>s... (%<percent>4.3g%%)\r", first: first, percent: percent)
             $stderr.print str
           end
 
           break if awaiting == 0 && queue.empty?
         end
 
         processed
       ensure
-        $stderr.print "\r\e[K\r" if $stderr.tty?
+        $stderr.print "\r\e[K\r" if should_log
         @forks.close
         @forks.wait
       end
     end
   end