code: function fileChanged(status, filepath) {
  			// If file was deleted and then re-added, consider it changed.
  			if (changedFiles[filepath] === 'deleted' && status === 'added') {
  				status = 'changed';
  			}
  			// Keep track of changed status for later.
  			changedFiles[filepath] = status;
  			// Emit watch events if anyone is listening
  			if (grunt.event.listeners('watch').length > 0) {
  				var matchingTargets = [];
  				targets.forEach(function(target) {
  					if (grunt.file.match(target.files, filepath).length > 0) {
  						matchingTargets.push(target.name);
  					}
  				});
  				matchingTargets.forEach(function(matchingTarget) {
  					grunt.event.emit('watch', status, filepath, matchingTarget);
  				});
  			}
  			// Keep track of changed status for later.
  			changedFiles[filepath] = status;
  			// Execute debounced done function.
  			done();
  		}
docs: Handle file changes.