Create lanes with non optional parameters and raises an error if we try to access a missing value from the `option` hash

demo.rb

###### BEFORE ######

lane :test do
  build
end

lane :build do |options|
  scheme = options[:scheme]
  # ...
end

# => scheme is missing but execution continues (which can lead to problems later)

###### AFTER ######

lane :test do
  build
end

secure_lane :build do |options|
  scheme = options[:scheme]
  # ...
end

# => scheme is missing but we get the exception: "Can't find value for key :scheme in lane :build"

RequiredOptions.rb

class Fastlane::FastFile # from https://github.com/fastlane/fastlane/blob/master/fastlane/lib/fastlane/fast_file.rb

  # Hash that raises an error when we access a missing value
  class RequiredOptions < Hash

    def initialize(options, lane)
      options.each { |key, value| self[key] = value }
      @lane = lane
    end

    def [](key)
      value = super(key)
      UI.user_error!("Can't find value for key :#{key} in lane :#{@lane}") if value.nil?
      value
    end
  end

  def secure_lane(name, &block)
    lane(name) do |options|
      options = RequiredOptions.new(options, name)
      block.call(options)
    end
  end

  def secure_private_lane(name, &block)
    private_lane(name) do |options|
      options = RequiredOptions.new(options, name)
      block.call(options)
    end
  end
end