UNION support.

Author: LastDragon-ru

src/Utils/SchemaPrinter.php

@@ -434,8 +434,17 @@ protected static function printUnion(UnionType $type, array $options): string
         $types = count($types) > 0
             ? ' = ' . implode(' | ', $types)
             : '';
+        $directives = static::printTypeDirectives($type, $options, '');
 
-        return static::printDescription($options, $type) . 'union ' . $type->name . $types;
+        if (mb_strlen($directives) >  static::LINE_LENGTH) {
+            $types = ltrim($types);
+            $directives .= "\n";
+        }
+
+        return static::printDescription($options, $type) .
+            'union ' . $type->name .
+            $directives .
+            $types;
     }
 
     /**
@@ -508,7 +517,7 @@ protected static function printBlock(array $items): string
     }
 
     /**
-     * @param Type|EnumValueDefinition|EnumType|InterfaceType|FieldDefinition $type
+     * @param Type|EnumValueDefinition|EnumType|InterfaceType|FieldDefinition|UnionType $type
      * @param array<string, bool> $options
      * @phpstan-param Options $options
      */

tests/Utils/SchemaPrinterTest.php

@@ -1335,6 +1335,10 @@ interface InterfaceB implements InterfaceA @test(value: "{$text}") {
             type TypeB implements InterfaceB @test(value: "{$text}") {
               a: ID
             }
+
+            union UnionA @test = TypeA | TypeB
+
+            union UnionB @test(value: "{$text}") = TypeA | TypeB
             GRAPHQL;
         $expected = /** @lang GraphQL */ <<<'GRAPHQL'
             directive @test(value: String) on SCHEMA | SCALAR | OBJECT | FIELD_DEFINITION | ARGUMENT_DEFINITION | INTERFACE | UNION | ENUM | ENUM_VALUE | INPUT_OBJECT | INPUT_FIELD_DEFINITION
@@ -1416,6 +1420,12 @@ interface InterfaceB implements InterfaceA
               a: ID
             }
 
+            union UnionA @test = TypeA | TypeB
+
+            union UnionB
+            @test(value: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
+            = TypeA | TypeB
+
             GRAPHQL;
         $actual = SchemaPrinter::doPrint(BuildSchema::build($schema), [
             'printDirectives' => static function(): bool {