grunt-filerev

Static asset revisioning through file content hash

Getting Started

If you haven't used grunt before, be sure to check out the Getting Started guide, as it explains how to create a gruntfile as well as install and use grunt plugins. Once you're familiar with that process, install this plugin with this command:

$ npm install --save-dev grunt-filerev

Overview

This task will revision your files based on its contents. You should then set the files to expire far into the future for better caching and it will only update when it changes.

Example

grunt.initConfig({
  filerev: {
    options: {
      algorithm: 'md5',
      length: 8
    },
    images: {
      src: 'img/**/*.{jpg,jpeg,gif,png,webp}'
    }
  },
});

Options

options.algorithm

Type: string
Default: 'md5'

algorithm is dependent on the available algorithms supported by the version of OpenSSL on the platform. Examples are 'sha1', 'md5', 'sha256', 'sha512', etc. On recent releases, openssl list-message-digest-algorithms will display the available digest algorithms.

options.length

Type: number
Default: 8

The number of characters of the file hash to prefix the file name with.

options.useQueryParam

Type: boolean
Default: false

Whether or not to use a query parameter (?rev=XXXXXXX) instead of actually renaming the files. This way, the files will retain their filename, but a query parameter containing the file hash can be attached and used in later references. The link to the file, including the query parameter can be found in the grunt.filerev.summary object and, e.g., be used in subsequent tasks like usemin.

Destination

It will overwrite the src files if you don't specify a dest:

filerev: {
  images: {
    src: ['img1.png', 'img2.png'],
    dest: 'tmp'
  }
}

Summary

The task keeps track of all files created and its sources in a summary that is exposed through the grunt.filerev.summary object. It can be used to replace references to the revved files or debugging purposes. The key of the object is the original filename, the value is the new revved path.

For a configuration like this

filerev: {
  images: {
    src: ['img1.png', 'img2.png'],
    dest: 'tmp'
  }
}

the content grunt.filerev.summary could look like that:

{
  'img1.png': 'tmp/img1.59bcc3ad.png',
  'img2.png': 'tmp/img2.060b1aa6.png'
}

Source Maps

The task will ensure that any source map for .css or .js file is revisioned with the same revision as the source file.

For example, js/main.js revisioned to js/main.9d713a59.js will also have js/main.js.map revisioned to the same hash js/main.9d713a59.js.map.

License

BSD license and copyright Google