Hook JavaScript's eval() using Ruby

js_eval_hook.rb

begin
  require 'bundler/inline'
rescue LoadError => error
  abort error.message
end

gemfile do
  source 'https://rubygems.org'
  gem 'therubyracer'
end

require 'v8'

ctx = V8::Context.new
ctx[:eval] = ->(this, code) { puts "eval(#{code})"; ctx.eval(code) }

p ctx.eval("eval(\"1 + 1\");")
# > eval(1 + 1)
# > 2