不在Rails/Rack应用程序中时，获取链轮以最小化CSS/JS [英] Getting Sprockets to minify CSS/JS while not in a Rails/Rack app

问题描述

我正在尝试使用Sprockets在Rails和Rack上下文之外组合并最小化我的JavaScript和CSS文件.到目前为止，我已经可以将它们组合成一个文件，但是现在我试图在这些文件上运行JS压缩器和CSS压缩器.

I'm trying to use Sprockets to combine and minify my JavaScript and CSS files outside of the Rails and Rack context. So far, I'm able to combine them into a single file, but now I'm trying to run the JS compressor and the CSS compressor on those files.

我遵循了Sprockets自述文件的说明( https://github.com/sstephenson/sprockets#minifying -assets )，但出现此错误:

I followed the Sprockets README's instructions (https://github.com/sstephenson/sprockets#minifying-assets), but I'm getting this error:

NoMethodError: undefined method `compress' for :uglify:Symbol

这是我完整的rakefile:

Here is my complete rakefile:

require 'rubygems'
require 'bundler'
require 'pathname'
require 'logger'
require 'fileutils'
require 'uglifier'

Bundler.require

ROOT        = Pathname(File.dirname(__FILE__))
LOGGER      = Logger.new(STDOUT)
BUNDLES     = %w( combined.css combined.js )
BUILD_DIR   = ROOT.join("dist")
SOURCE_DIR  = ROOT.join("src")

task :compile do
  sprockets = Sprockets::Environment.new(ROOT) do |env|
    env.logger = LOGGER
    env.append_path SOURCE_DIR.join('javascripts').to_s
    env.append_path SOURCE_DIR.join('stylesheets').to_s
    env.js_compressor = :uglify
  end

  BUNDLES.each do |bundle|
    assets = sprockets.find_asset(bundle)
    prefix, basename = assets.pathname.to_s.split('/')[-2..-1]
    FileUtils.mkpath BUILD_DIR.join(prefix)

    assets.write_to(BUILD_DIR.join(prefix, basename))
  end
end

我尝试了以下操作(扰流板警报:它们不起作用):

I've tried the following (spoiler alert: they don't work):

1. env.js_compressor = :uglifier
2. env.js_compressor = Uglifier
3. env.js_compressor = Uglify

1. env.js_compressor = :uglifier
2. env.js_compressor = Uglifier
3. env.js_compressor = Uglify

我仍然得到了每个compress的NoMethodError.

启用JS压缩的正确方法是什么?那CSS呢? (我在这里遇到了类似的问题.)

What is the correct way to enable JS compression? What about CSS? (I am experiencing the similar issues there.)

======= 除了以下标记的答案外，请注意以下事项:

====== In addition to the answer marked below, please note this:

对于任何好奇的人，您都应该实例化您的压缩器，并确保其响应compress:

For anyone who is curious, you'd have instantiate your compressor and make sure it responds to compress:

env.js_compressor = YUI::JavaScriptCompressor.new  
env.css_compressor = YUI::CssCompressor.new

推荐答案

我尝试了一下(下面的示例)，它对我有用.我会怀疑您的Sprockets版本已经过时，因为您要使用的速记符符号是在2.7.0版中引入的.我会做一个gem upgrade并希望能解决它.

I tried it out (example below), and it worked for me. I would suspect that you have an outdated version of Sprockets, since the shorthand minifier notation you want to use was introduced quite recently in version 2.7.0. I would do a gem upgrade and hopefully that fixes it.

Rakefile示例(在运行rake compile之后，在包含未压缩的non-min.js文件的目录中生成了一个压缩的min.js文件):

Example Rakefile (in a directory containing an unminified non-min.js file, after running rake compile a minified min.js file was generated):

require 'sprockets'

ROOT = Pathname(File.dirname(__FILE__))

task :compile do
  sprockets = Sprockets::Environment.new(ROOT) do |env|
    env.append_path './'
    env.js_compressor = :uglify
  end

  assets = sprockets.find_asset("non-min.js")
  assets.write_to("./min.js")
end

---

更新:要验证我的回答，我安装了旧版本的Sprockets(v2.6.0)，并收到了与您相同的错误消息.

---

Update: To verify my answer above, I installed an older version of Sprockets (v2.6.0) and got the same error message as you did.

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