Autoload nested constants

Reduces require time from ~125ms to ~5ms. Autoloads all constants under
`GraphQL` to optimize boot time. Also autoloads `GraphQL::Types` because
they can't be required in sequence.use they can't be required in sequence.

lib/graphql.rb

@@ -74,53 +74,90 @@ class << self
   end
 
   self.reject_numbers_followed_by_names = false
-end
 
-# Order matters for these:
-
-require "graphql/execution_error"
-require "graphql/runtime_type_error"
-require "graphql/unresolved_type_error"
-require "graphql/invalid_null_error"
-require "graphql/analysis_error"
-require "graphql/coercion_error"
-require "graphql/invalid_name_error"
-require "graphql/integer_decoding_error"
-require "graphql/integer_encoding_error"
-require "graphql/string_encoding_error"
-require "graphql/date_encoding_error"
-require "graphql/duration_encoding_error"
-require "graphql/type_kinds"
-require "graphql/name_validator"
-require "graphql/language"
-
-require_relative "./graphql/railtie" if defined? Rails::Railtie
-
-require "graphql/analysis"
-require "graphql/tracing"
-require "graphql/dig"
-require "graphql/execution"
-require "graphql/pagination"
-require "graphql/schema"
-require "graphql/query"
-require "graphql/dataloader"
-require "graphql/types"
-require "graphql/static_validation"
-require "graphql/execution"
-require "graphql/schema/built_in_types"
-require "graphql/schema/loader"
-require "graphql/schema/printer"
-require "graphql/introspection"
-require "graphql/relay"
+  def self.eager_load!
+    [
+      ExecutionError,
+      RuntimeTypeError,
+      UnresolvedTypeError,
+      InvalidNullError,
+      AnalysisError,
+      CoercionError,
+      InvalidNameError,
+      IntegerDecodingError,
+      IntegerEncodingError,
+      StringEncodingError,
+      DateEncodingError,
+      DurationEncodingError,
+      TypeKinds,
+      NameValidator,
+      Language,
+      Analysis,
+      Tracing,
+      Dig,
+      Execution,
+      Pagination,
+      Schema,
+      Query,
+      Dataloader,
+      Types,
+      *Types.eager_load!,
+      StaticValidation,
+      Execution,
+      Introspection,
+      Relay,
+      Subscriptions,
+      ParseError,
+      Backtrace,
+      UnauthorizedError,
+      UnauthorizedEnumValueError,
+      UnauthorizedFieldError,
+      LoadApplicationObjectFailedError,
+      Testing,
+      Current,
+    ]
+  end
+
+  autoload :ExecutionError, "graphql/execution_error"
+  autoload :RuntimeTypeError, "graphql/runtime_type_error"
+  autoload :UnresolvedTypeError, "graphql/unresolved_type_error"
+  autoload :InvalidNullError, "graphql/invalid_null_error"
+  autoload :AnalysisError, "graphql/analysis_error"
+  autoload :CoercionError, "graphql/coercion_error"
+  autoload :InvalidNameError, "graphql/invalid_name_error"
+  autoload :IntegerDecodingError, "graphql/integer_decoding_error"
+  autoload :IntegerEncodingError, "graphql/integer_encoding_error"
+  autoload :StringEncodingError, "graphql/string_encoding_error"
+  autoload :DateEncodingError, "graphql/date_encoding_error"
+  autoload :DurationEncodingError, "graphql/duration_encoding_error"
+  autoload :TypeKinds, "graphql/type_kinds"
+  autoload :NameValidator, "graphql/name_validator"
+  autoload :Language, "graphql/language"
+
+  autoload :Analysis, "graphql/analysis"
+  autoload :Tracing, "graphql/tracing"
+  autoload :Dig, "graphql/dig"
+  autoload :Execution, "graphql/execution"
+  autoload :Pagination, "graphql/pagination"
+  autoload :Schema, "graphql/schema"
+  autoload :Query, "graphql/query"
+  autoload :Dataloader, "graphql/dataloader"
+  autoload :Types, "graphql/types"
+  autoload :StaticValidation, "graphql/static_validation"
+  autoload :Execution, "graphql/execution"
+  autoload :Introspection, "graphql/introspection"
+  autoload :Relay, "graphql/relay"
+  autoload :Subscriptions, "graphql/subscriptions"
+  autoload :ParseError, "graphql/parse_error"
+  autoload :Backtrace, "graphql/backtrace"
+
+  autoload :UnauthorizedError, "graphql/unauthorized_error"
+  autoload :UnauthorizedEnumValueError, "graphql/unauthorized_enum_value_error"
+  autoload :UnauthorizedFieldError, "graphql/unauthorized_field_error"
+  autoload :LoadApplicationObjectFailedError, "graphql/load_application_object_failed_error"
+  autoload :Testing, "graphql/testing"
+  autoload :Current, "graphql/current"
+end
 
 require "graphql/version"
-require "graphql/subscriptions"
-require "graphql/parse_error"
-require "graphql/backtrace"
-
-require "graphql/unauthorized_error"
-require "graphql/unauthorized_enum_value_error"
-require "graphql/unauthorized_field_error"
-require "graphql/load_application_object_failed_error"
-require "graphql/testing"
-require "graphql/current"
+require "graphql/railtie" if defined? Rails::Railtie

lib/graphql/railtie.rb

@@ -4,6 +4,7 @@ module GraphQL
   class Railtie < Rails::Railtie
     config.graphql = ActiveSupport::OrderedOptions.new
     config.graphql.parser_cache = false
+    config.eager_load_namespaces << GraphQL
 
     initializer("graphql.cache") do |app|
       if config.graphql.parser_cache

lib/graphql/schema.rb

@@ -1802,3 +1802,7 @@ module DefaultTraceClass
     end
   end
 end
+
+require "graphql/schema/built_in_types"
+require "graphql/schema/loader"
+require "graphql/schema/printer"

lib/graphql/schema/relay_classic_mutation.rb

@@ -1,5 +1,4 @@
 # frozen_string_literal: true
-require "graphql/types/string"
 
 module GraphQL
   class Schema

lib/graphql/types.rb

@@ -1,12 +1,33 @@
 # frozen_string_literal: true
-require "graphql/types/boolean"
-require "graphql/types/big_int"
-require "graphql/types/float"
-require "graphql/types/id"
-require "graphql/types/int"
-require "graphql/types/iso_8601_date"
-require "graphql/types/iso_8601_date_time"
-require "graphql/types/iso_8601_duration"
-require "graphql/types/json"
-require "graphql/types/string"
-require "graphql/types/relay"
+
+module GraphQL
+  module Types
+    def self.eager_load!
+      [
+        Boolean,
+        BigInt,
+        Float,
+        ID,
+        Int,
+        JSON,
+        String,
+        ISO8601Date,
+        ISO8601DateTime,
+        ISO8601Duration,
+        Relay,
+      ]
+    end
+
+    autoload :Boolean, "graphql/types/boolean"
+    autoload :BigInt, "graphql/types/big_int"
+    autoload :Float, "graphql/types/float"
+    autoload :ID, "graphql/types/id"
+    autoload :Int, "graphql/types/int"
+    autoload :JSON, "graphql/types/json"
+    autoload :String, "graphql/types/string"
+    autoload :ISO8601Date, "graphql/types/iso_8601_date"
+    autoload :ISO8601DateTime, "graphql/types/iso_8601_date_time"
+    autoload :ISO8601Duration, "graphql/types/iso_8601_duration"
+    autoload :Relay, "graphql/types/relay"
+  end
+end

spec/graphql/types/iso_8601_date_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 require "spec_helper"
-require "graphql/types/iso_8601_date"
+
 describe GraphQL::Types::ISO8601Date do
   module DateTest
     class DateObject < GraphQL::Schema::Object

spec/graphql/types/iso_8601_date_time_spec.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 require "spec_helper"
-require "graphql/types/iso_8601_date_time"
+
 describe GraphQL::Types::ISO8601DateTime do
   module DateTimeTest
     class DateTimeObject < GraphQL::Schema::Object