NAME

       GraphQL::Plugin::Type - GraphQL plugins implementing types

SYNOPSIS

         package GraphQL::Plugin::Type::DateTime;
         use Moo;
         extends qw(GraphQL::Plugin::Type);
         my $iso8601 = DateTime::Format::ISO8601->new;
         GraphQL::Plugin::Type->register(
           GraphQL::Type::Scalar->new(
             name => 'DateTime',
             serialize => sub { return if !defined $_[0]; $_[0].'' },
             parse_value => sub { return if !defined $_[0]; $iso8601->parse_datetime(@_); },
           )
         );
         1;

         package main;
         use GraphQL::Schema;
         use GraphQL::Plugin::Type::DateTime;
         use GraphQL::Execution qw(execute);
         my $schema = GraphQL::Schema->from_doc(<<'EOF');
         type Query { dateTimeNow: DateTime }
         EOF
         post '/graphql' => sub {
           send_as JSON => execute(
             $schema,
             body_parameters->{query},
             { dateTimeNow => sub { DateTime->now } },
             undef,
             body_parameters->{variables},
             body_parameters->{operationName},
             undef,
           );
         };

DESCRIPTION

       Class implementing the scheme by which additional GraphQL type classes can be implemented.

       The author considers this is only worth doing for scalars, and indeed this scheme is (now)
       how the non-standard "DateTime" is implemented in graphql-perl. If one wants to create
       other types (GraphQL::Type::Object, GraphQL::Type::InputObject, etc), then the Schema
       Definition Language is already available. However, any type can be registered with the
       "register" method, and will be automatically available to GraphQL::Schema objects with no
       additional code.

METHODS

   register($graphql_type)
       When called with a GraphQL::Type subclass, will register it, otherwise dies.

   registered
       Returns a list of registered classes.