Using dry-system for typed and verified Rails configuration settings

settings.rb

# frozen_string_literal: true

require "dry/system/errors"
require "dry/system/settings"
require "dry/types"

module Types
  include Dry.Types()
end

SettingsSchema = Dry::System::Settings::DSL.new do
  key :domain, Types::Strict::String.default("example.com")

  key :calendar_url, Types::Strict::String

  key :twilio_account_id, Types::Strict::String.optional.default(nil)
  key :twilio_auth_token, Types::Strict::String.optional.default(nil)

  key :phone_number, Types::Strict::String
  key :host_phone_number, Types::Strict::String
end

Settings = SettingsSchema.call.init(Rails.root, Rails.env)