Rakefile to check project structure for Zeitwerk compatibility

Rakefile

require File.expand_path("config/environment", __dir__)
require "zeitwerk"

namespace :zeitwerk do
  desc "Check project structure for Zeitwerk compatibility"
  task :check do
    base_directory = Pathname.new "lib"

    loader = Zeitwerk::Loader.new

    root = File.expand_path __dir__
    lib_dir = File.join root, "lib"
    config_dir = File.join root, "lib"
    ext_dir = File.join root, "lib", "gem-ext"

    loader.push_dir lib_dir
    loader.push_dir config_dir
    loader.collapse ext_dir

    loader.inflector.inflect(
      "jwt" => "JWT",
      "api" => "API",
      "api_v1" => "APIv1",
      "api_v2" => "APIv2",
      "rabbitmq" => "RabbitMQ",
      "api_helper" => "APIHelper"
    )

    loader.setup

    failures = []

    base_directory.glob("**/*.rb") do |file|
      cname = loader.cpath_expected_at(file)
      next unless cname

      begin
        if cname
          require_relative file.to_s
          cname.constantize
        end
      rescue NameError=> e
        failures <<  { file: file, cname: cname, error: "NameError" }
      rescue LoadError
        failures << { file: file, cname: cname, error: "LoadError" }
      end
    end

    failures.each do |failure|
      puts "Expected #{failure[:file]} to define #{failure[:cname]} (#{failure[:error]})"
    end
  end
end