GraphQL: Type Module Cheat Sheet

Definitions

GraphQLSchema

A representation of the capabilities of a GraphQL Server.

class GraphQLSchema {
  constructor(config: GraphQLSchemaConfig)
}

type GraphQLSchemaConfig = {
  query: GraphQLObjectType;
  mutation?: ?GraphQLObjectType;
}

GraphQLScalarType

A scalar type within GraphQL.

class GraphQLScalarType<InternalType> {
  constructor(config: GraphQLScalarTypeConfig<InternalType>)
}

type GraphQLScalarTypeConfig<InternalType> = {
  name: string;
  description?: ?string;
  serialize: (value: mixed) => ?InternalType;
  parseValue?: (value: mixed) => ?InternalType;
  parseLiteral?: (valueAST: Value) => ?InternalType;
}

GraphQLInterfaceType 

An interface type within GraphQL that defines field implementations will contain.

class GraphQLInterfaceType {
  constructor(config: GraphQLInterfaceTypeConfig)
}

type GraphQLInterfaceTypeConfig = {
  name: string,
  fields: GraphQLFieldConfigMapThunk | GraphQLFieldConfigMap,
  resolveType?: (value: any, info?: GraphQLResolveInfo) => ?GraphQLObjectType,
  description?: ?string
};

GraphQLUnionType

A union type within GraphQL that defines a list of implementations.

class GraphQLUnionType {
  constructor(config: GraphQLUnionTypeConfig)
}

type GraphQLUnionTypeConfig = {
  name: string,
  types: GraphQLObjectsThunk | Array<GraphQLObjectType>,
  resolveType?: (value: any, info?: GraphQLResolveInfo) => ?GraphQLObjectType;
  description?: ?string;
};

type GraphQLObjectsThunk = () => Array<GraphQLObjectType>;

GraphQLEnumType 

An enum type within GraphQL that defines a list of valid values.

class GraphQLEnumType {
  constructor(config: GraphQLEnumTypeConfig)
}

type GraphQLEnumTypeConfig = {
  name: string;
  values: GraphQLEnumValueConfigMap;
  description?: ?string;
}

type GraphQLEnumValueConfigMap = {
  [valueName: string]: GraphQLEnumValueConfig;
};

type GraphQLEnumValueConfig = {
  value?: any;
  deprecationReason?: string;
  description?: ?string;
}

type GraphQLEnumValueDefinition = {
  name: string;
  value?: any;
  deprecationReason?: string;
  description?: ?string;
}

GraphQLInputObjectType

An input object type within GraphQL that represents structured inputs.

class GraphQLInputObjectType {
  constructor(config: GraphQLInputObjectConfig)
}

type GraphQLInputObjectConfig = {
  name: string;
  fields: GraphQLInputObjectConfigFieldMapThunk | GraphQLInputObjectConfigFieldMap;
  description?: ?string;
}

type GraphQLInputObjectConfigFieldMapThunk = () => GraphQLInputObjectConfigFieldMap;

type GraphQLInputObjectFieldConfig = {
  type: GraphQLInputType;
  defaultValue?: any;
  description?: ?string;
}

type GraphQLInputObjectConfigFieldMap = {
  [fieldName: string]: GraphQLInputObjectFieldConfig;
};

type GraphQLInputObjectField = {
  name: string;
  type: GraphQLInputType;
  defaultValue?: any;
  description?: ?string;
}

type GraphQLInputObjectFieldMap = {
  [fieldName: string]: GraphQLInputObjectField;
};

GraphQLList 

A type wrapper around other types that represents a list of those types.

class GraphQLList {
  constructor(type: GraphQLType)
}

GraphQLNonNull

A type wrapper around other types that represents a non-null version of those types.

class GraphQLNonNull {
  constructor(type: GraphQLType)
}

Predicates

isInputType 

Returns if a type can be used as input types for arguments and directives.

function isInputType(type: ?GraphQLType): boolean

isOutputType 

Returns if a type can be used as output types as the result of fields.

function isOutputType(type: ?GraphQLType): boolean

isLeafType 

Returns if a type can be a leaf value in response.

function isLeafType(type: ?GraphQLType): boolean

isCompositeType 

Returns if a type can be the parent context of a selection set.

function isCompositeType(type: ?GraphQLType): boolean

isAbstractType 

Returns if a type is a combination of object types.

function isAbstractType(type: ?GraphQLType): boolean

Un-modifiers

getNullableType 

Strips any non-null wrappers from a type.

function getNullableType(type: ?GraphQLType): ?GraphQLNullableType

getNamedType 

Strips any non-null or list wrappers from a type.

function getNamedType(type: ?GraphQLType): ?GraphQLNamedType

Scalars

GraphQLInt 

A scalar type representing integers.

var GraphQLInt: GraphQLScalarType;

GraphQLFloat 

A scalar type representing floats.

var GraphQLFloat: GraphQLScalarType;

GraphQLString 

A scalar type representing strings.

var GraphQLString: GraphQLScalarType;

GraphQLBoolean 

A scalar type representing booleans.

var GraphQLBoolean: GraphQLScalarType;

GraphQLID 

A scalar type representing IDs.

var GraphQLID: GraphQLScalarType;