text: var split = require("split"),
  	through = require("through");
  
  module.exports = function(stream, done) {
  	var sourceMappingLine;
  
  	stream.pipe(split()).pipe(through(function(chunk) {
  		if(chunk.indexOf("sourceMappingURL") !== -1) {
  			sourceMappingLine = chunk;
  		}
  	}, function() {
  		if(sourceMappingLine) {
  			var fileName = sourceMappingLine.split("=")[1];
  			if(fileName) return done(null, fileName.split(" ")[0]);
  			return done(null, false);
  		}
  		done(null, false);
  	}));
  }
  