How do you create an environment?

The README says

env = CommonJS::Environment.new(:path => '/path/to/lib/dir')

But it doesn't explain what the path to lib directory is supposed to be a path to? What library? I've tried using the current directory but get an error.

1.9.3-p484 :024 >   env = CommonJS::Environment.new(:path => './')
TypeError: can't convert nil into String
    from /Users/mgwelch/.rvm/gems/ruby-1.9.3-p484/gems/commonjs-0.2.7/lib/commonjs/environment.rb:9:in `initialize'
    from /Users/mgwelch/.rvm/gems/ruby-1.9.3-p484/gems/commonjs-0.2.7/lib/commonjs/environment.rb:9:in `Pathname'
    from /Users/mgwelch/.rvm/gems/ruby-1.9.3-p484/gems/commonjs-0.2.7/lib/commonjs/environment.rb:9:in `block in initialize'
    from /Users/mgwelch/.rvm/gems/ruby-1.9.3-p484/gems/commonjs-0.2.7/lib/commonjs/environment.rb:9:in `map'
    from /Users/mgwelch/.rvm/gems/ruby-1.9.3-p484/gems/commonjs-0.2.7/lib/commonjs/environment.rb:9:in `initialize'
    from (irb):24:in `new'
    from (irb):24
    from /Users/mgwelch/.rvm/rubies/ruby-1.9.3-p484/bin/irb:12:in `<main>'

[RKushnir]

The readme is wrong.
The constructor actually takes 2 arguments - runtime and options(which are empty hash by default, but default doesn't work), see

commonjs.rb/lib/commonjs/environment.rb

Line 7 in 79dbbf0

def initialize(runtime, options = {})

[MhdSyrwan]

You can find an example of a successful environment object creation here
https://github.com/cowboyd/commonjs.rb/blob/master/spec/spec_helper.rb

Example:

js = CommonJS::Environment.new(V8::Context.new, path: './node_modules')

[rogsmith]

Any ideas on how I can eval() js code now if I am using commonjs and therubyracer?

[bbozo]

What rogsmith said :)

[orta]

Looking at the source - this will just add them as modules into the existing runtime, you would re-use the V8::Context.new to eval things.