webpack.rb

require 'therubyracer'
require 'commonjs'

webpack_path = `which webpack`.chomp
webpack_content = File.open(webpack_path).read.sub("#!/usr/bin/env node\n", '')

ctx = V8::Context.new
env = CommonJS::Environment.new(ctx, path: '/usr/local/lib/node_modules')
ctx['require'] = lambda { |this, module_id| env.require(module_id) }

# trying to get webpack "cli" to execute under therubyracer:
puts ctx.eval(webpack_content)

# the issue is that while I was able to inject require, it doesn find any npm module