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How to debug services via callbacks?

Use after result​

after :result do |result|
  binding.pry
end

Use after step​

##
# Step is Result-like duck.
#
after :step do |step|
  byebug
end

Use around result​

after :result do |chain|
  puts "before"

  result = chain.yield

  p "after"
end

Use after step​

##
# Step is Result-like duck.
#
after :step do |step|
  binding.break

  step = chain.yield

  print "after"
end

Real-world example​

# frozen_string_literal: true

module Services
  class AssertNpmPackageAvailable
    include ConvenientService::Standard::Config

    attr_reader :name

    step :validate_name

    step Services::AssertNodeAvailable

    step Services::RunShell, in: {command: -> { "npm list #{name} --depth=0 > /dev/null 2>&1" }}

    after :result do |result|
      binding.pry
    end

    after :step do |step|
      byebug
    end

    def initialize(name:)
      @name = name
    end

    private

    def validate_name
      return error("Name is `nil`") if name.nil?
      return error("Name is empty") if name.empty?

      success
    end
  end
end