Changed

• PHP version required: 7.4+
• Propagate error message and stack trace for why leaf value serialization failed
• Do not throw client safe Error when failing to serialize an Enum type
• Use native PHP types for properties of Type and its subclasses
• Throw SerializationError over client safe Error when failing to serialize leaf types
• Move debug entries in errors under extensions key
• Use native PHP types wherever possible
• Always throw RequestError with useful message when clients provide an invalid JSON body
• Move class BlockString from namespace GraphQL\Utils to GraphQL\Language
• Return string-keyed arrays from GraphQL::getStandardDirectives(), GraphQL::getStandardTypes() and GraphQL::getStandardValidationRules()
• Move complexity related code from FieldDefinition to QueryComplexity
• Exclude unused standard types from the schema
• Require lazy type loader to return Type directly without an intermediary callable
• Allow lazy type loader to return null
• Rename ServerConfig option persistentQueryLoader to persistedQueryLoader
• Call previously unused methods EnumType::parseValue() and EnumType::parseLiteral()
• Strongly type PromiseAdapter::createRejected() to require \Throwable
• Move members specific to NamedType out of Type: $name, $description, $config, isBuiltInType(), assertValid()
• Always convert recursively when calling Node::toArray()
• Make Directive::$config['args'] use the same definition style as FieldDefinition::$config['args']
• Rename FieldArgument to Argument
• Make errors when parsing scalar literals more precise
• Change expected QueryPlan options from ['group-implementor-fields'] to ['groupImplementorFields' => true] in ResolveInfo::lookAhead()
• Always convert promises through PromiseAdapter::convertThenable() before calling ->then() on them
• Use JSON_THROW_ON_ERROR in json_encode()
• Validate some internal invariants through assert()
• PromiseAdapter::all() accepts iterable
• Throw if Introspection::fromSchema() returns no data
• Reorganize abstract class ASTValidationContext to interface ValidationContext
• Reorganize AST interfaces related to schema and type extensions
• Align Utils::suggestionList() with the reference implementation (#1075)
• Order schema topologically and according to the user-defined order, affects introspection and printing
• GraphQL\Utils\AST::typeFromAST() now needs a type loader callable instead of the Schema
• Do not change HTTP status code in StandardServer
• Use " instead of """ for single line descriptions
• Make Helper::emitResponse() private, use Helper::sendResponse()
• Emit unescaped UTF-8 from StandardServer
• Sync input value coercion with graphql-js reference implementation

Added

• Improve extendability of validator rules
• Add tests for errors that occur when undeclared fields are passed in input
• Warn about orphaned object types
• Expose structured enumeration of directive locations
• Add AST::concatAST() utility
• Allow lazy input object fields
• Add validation rule UniqueEnumValueNames
• Add SDL validation rule UniqueOperationTypes (#995)
• Add ability to remove custom validation rules after adding them via DocumentValidator::removeRule()
• Allow lazy enum values
• Make Node implement JsonSerializable
• Add SDL validation rule UniqueTypeNames (#998)
• Add support for SDL validation to KnownTypeNames rule (#999)
• Add SDL validation rule UniqueArgumentDefinitionNames (#1136)
• Add parseValue config option to InputObjectType to parse input value to custom value object
• Add option sortTypes to have SchemaPrinter order types alphabetically
• Allow constructing EnumType from PHP enum
• Add TypeInfo::getParentTypeStack() and TypeInfo::getFieldDefStack()
• Include path to faulty input in coercion errors
• Add ability to resolve abstract type of object via __typename

Optimized

• Use recursive algorithm for printer and improve its performance
• Use foreach over slower functions array_map() and Utils::map()

Fixed

• Avoid QueryPlan crash when multiple $fieldNodes are present
• Clarify error when attempting to coerce anything but array or stdClass to an input object
• Allow directives on variable definitions
• Handle null parent of list in ValuesOfCorrectType::getVisitor
• Allow sending both query and queryId, ignore queryId in that case
• Preserve extended methods from class-based types in SchemaExtender::extend()
• Fix printing of empty types (#940)
• Clone NodeList in Node::cloneDeep()
• Calling Schema::getType() on a schema built from SDL returns null for unknown types (#1068)
• Avoid crash on typeless inline fragment when using QueryComplexity rule
• Avoid calling FormattedError::addDebugEntries() twice when using default error formatting
• Avoid calling defined functions named like lazily loaded types
• Show actual error in debug entries

Removed

• Remove OperationParams method getOriginalInput() in favor of public property $originalInput
• Remove OperationParams method isReadOnly() in favor of public property $readOnly
• Remove Utils::withErrorHandling()
• Remove TypeComparators::doTypesOverlap()
• Remove DocumentValidator::isError()
• Remove DocumentValidator::append()
• Remove Utils::getVariableType() in favor of Utils::printSafe()
• Remove warning for passing isDeprecated in field definition config
• Remove WrappingType::getWrappedType() argument $recurse in favor of WrappingType::getInnermostType()
• Remove Type::assertType()
• Remove ListOfType::$ofType, ListOfType::getOfType() and NonNull::getOfType()
• Remove option commentDescriptions from BuildSchema::buildAST(), BuildSchema::build() and Printer::doPrint()
• Remove parameter $options from ASTDefinitionBuilder
• Remove FieldDefinition::create() in favor of new FieldDefinition()
• Remove GraphQL\Exception\InvalidArgument
• Remove Utils::find(), Utils::every() and Utils::invariant()
• Remove argument bool $exitWhenDone from StandardServer::send500Error() and StandardServer::handleRequest()
• Remove Schema::getAstNode() in favor of Schema::$astNode
• Remove ability to override standard types through Schema option types, use Type::overrideStandardTypes()
• Remove GraphQL\Utils\TypeInfo::typeFromAST(), use GraphQL\Utils\AST::typeFromAST()
• Remove StandardServer::send500Error(), handle non-GraphQL errors yourself
• Remove StandardServer::getHelper(), use new Helper
• Remove error extension field category, use custom error formatting if you still need it
• Remove deprecated Type::getInternalTypes()
• Remove deprecated GraphQL::execute()
• Remove deprecated GraphQL::executeAndReturnResult()
• Remove deprecated experimental CoroutineExecutor
• Remove deprecated FormattedError::create() and FormattedError::createFromPHPError()
• Remove deprecated GraphQL::setPromiseAdapter()
• Remove deprecated AST::getOperation()
• Remove deprecated constants from BreakingChangesFinder
• Remove deprecated DocumentValidator::isValidLiteralValue()
• Remove deprecated Error::formatError() and Error::toSerializableArray()
• Remove deprecated GraphQL::getInternalDirectives()
• Remove deprecated Schema::isPossibleType()
• Remove deprecated methods from TypeInfo
• Remove deprecated Values::valueFromAST() and Values::isValidPHPValue()
• Remove deprecated public property access to InputObjectField::$type
• Remove deprecated public property access to FieldDefinition::$type
• Remove alias GraphQL\Validator\Rules\AbstractQuerySecurity, use GraphQL\Validator\Rules\QuerySecurityRule
• Remove alias GraphQL\Validator\Rules\AbstractValidationRule, use GraphQL\Validator\Rules\ValidationRule
• Remove alias GraphQL\Utils\FindBreakingChanges, use GraphQL\Utils\BreakingChangesFinder