old_contents: // grunt-flex-svg
  // Copyright (c) 2014 Shinnosuke Watanabe
  // Licensed under the MIT license
  
  'use strict';
  
  var fs = require('fs');
  var flexSvg = require('flex-svg');
  var eachAsync = require('each-async');
  var chalk = require('chalk');
  
  module.exports = grunt => {
    grunt.registerMultiTask(
      'flex_svg',
      'Create SVG with flexible size.',
      function flexSvgTask() {
        var readOption = {encoding: grunt.file.defaultEncoding};
  
        eachAsync(this.files, (map, index, next) => {
          var src = map.src[0];
  
          if (!src) {
            grunt.log.warn(`Destination ${
              chalk.cyan(map.dest)
            } not written because src files were empty.`);
            return next();
          }
  
          fs.readFile(src, readOption, (readError, data) => {
            if (readError) {
              grunt.log.warn(`Source file "${ map.src }" not found.`);
              return next();
            }
            flexSvg(data, (parseError, result) => {
              if (parseError) {
                grunt.warn('Error parsing svg: ' + parseError);
              } else {
                grunt.file.write(map.dest, result);
                grunt.log.writeln(`File ${ chalk.cyan(map.dest) } created.`);
              }
              next();
            });
          });
        }, this.async());
      }
    );
  };
  
new_contents: // grunt-flex-svg
  // Copyright (c) 2014 Shinnosuke Watanabe
  // Licensed under the MIT license
  
  'use strict';
  
  var fs = require('fs');
  var flexSvg = require('flex-svg');
  var eachAsync = require('each-async');
  var chalk = require('chalk');
  
  module.exports = grunt => {
    grunt.registerMultiTask(
      'flex_svg',
      'Create SVG with flexible size.',
      function flexSvgTask() {
        var readOption = {encoding: grunt.file.defaultEncoding};
  
        eachAsync(this.files, (map, index, next) => {
          var src = map.src[0];
  
          if (!src) {
            grunt.log.warn(`Destination ${
              chalk.cyan(map.dest)
            } not written because src files were empty.`);
            return next();
          }
  
          fs.readFile(src, readOption, (readError, data) => {
            if (readError) {
              grunt.log.warn(`Source file "${map.src}" not found.`);
              return next();
            }
            flexSvg(data, (parseError, result) => {
              if (parseError) {
                grunt.warn('Error parsing svg: ' + parseError);
              } else {
                grunt.file.write(map.dest, result);
                grunt.log.writeln(`File ${ chalk.cyan(map.dest) } created.`);
              }
              next();
            });
          });
        }, this.async());
      }
    );
  };
  
subject: fix coding style