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grunt-retro Build status

Add grunt@0.4 functionality to grunt@0.3 plugins

Getting Started

Install this grunt plugin next to your project's grunt.js gruntfile with: npm install grunt-retro

Then inside your grunt plugin or grunt.js (depending on the scope of your intent), load and bind grunt-retro to grunt:

// Inside of grunt plugin (MUST BE DONE IMMEDIATELY AFTER module.exports) 
module.exports = function (grunt) {
  grunt = require('grunt-retro')(grunt);
  // Continue with normal actions 


grunt-retro takes care of the gotchas between grunt@0.3 and grunt@0.4. Below is a list of what we guarantee to work:

  • Define this.file to match the 0.3 specification; {src, file}
  • Fallback this.utils to be an object of grunt utilites
  • Allow for registerTask to alias multiple tasks via single string
grunt.registerTask('multi-task', 'lint clean test');
  • Add back grunt.helper and grunt.registerHelper system


  • Plugins will receive the same array or non-array input from this.file.src
    • In 0.4, this is normalized to always be an array.
  • Fallback grunt.file.glob.minimatch


grunt plugin

module.exports = function (grunt) {
  // Bind retro functionality 
  grunt = require('grunt-retro')(grunt);
  // Create and register our task 
  grunt.registerTask('rot13', 'Rotate a file by 13', function () {
    // Grab file locations -- normally, we would expandFiles(src) 
    var file = this.file,
        src = file.src,
        dest = file.dest;
    // Rotate content 
    var input =,
        output = grunt.helper('rot13', input);
    // Write out content 
    grunt.file.write(dest, output);
  // Register a helper for performing rot13 
  grunt.registerHelper('rot13', rot13Fn);


module.exports = function (grunt) {
  // Bind retro functionality 
  grunt = require('grunt-retro')(grunt);
  // Set up config 
  // Register default task 
  grunt.registerTask('default', 'lint test');


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In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint your code using grunt and test via npm test.


As of Sep 15 2013, Todd Wolfson has released this repository and its contents to the public domain.

It has been released under the UNLICENSE.

Prior to Sep 15 2013, this repository and its contents were licensed under the MIT license.