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introspection

Library for introspecting a GraphQL schema. The entry point method is getSchemaMap.

IntrospectionError​

Defined in: packages/graphql/src/introspection.ts:45

Extends​

  • Error

Constructors​

new IntrospectionError()​

new IntrospectionError(message?): IntrospectionError

Defined in: node_modules/typescript/lib/lib.es5.d.ts:1082

Parameters​
message?​

string

Returns​

IntrospectionError

Inherited from​
Error.constructor

new IntrospectionError()​

new IntrospectionError(message?, options?): IntrospectionError

Defined in: node_modules/typescript/lib/lib.es5.d.ts:1082

Parameters​
message?​

string

options?​

ErrorOptions

Returns​

IntrospectionError

Inherited from​
Error.constructor

_getFields()​

function _getFields<T, V>(
   type, 
   processor?, 
   fallback?): 
  | GraphQLFieldMap<unknown, unknown>
  | GraphQLInputFieldMap
  | V
| GraphQLObjectType<any, any>

Defined in: packages/graphql/src/introspection.ts:317

Returns the fields from a GraphQL schema type.

see getOperation, getFields

Type Parameters​

• T

• V

Parameters​

type​

T

the GraphQL schema type to parse.

processor?​

(fieldMap) => V

optional callback function to parse the fields map.

fallback?​

V

optional fallback value, undefined if not set.

Returns​

| GraphQLFieldMap<unknown, unknown> | GraphQLInputFieldMap | V | GraphQLObjectType<any, any>

a map of fields as k/v records, or fallback value if no fields available.

getDirective()​

function getDirective(entity, directives): GraphQLDirective[]

Defined in: packages/graphql/src/introspection.ts:226

Returns a schema entity's list of directives matching a defined set.

Parameters​

entity​

unknown

a GraphQL schema entity.

directives​

Maybe<GraphQLDirective[]>

a directive name or a list of directive names.

Returns​

GraphQLDirective[]

a list of GraphQL directives matching the set, else false.

getDirectiveLocationForASTPath()​

function getDirectiveLocationForASTPath(appliedTo): DirectiveLocation

Defined in: packages/graphql/src/introspection.ts:113

Parameters​

appliedTo​

Maybe<ASTNode>

Returns​

DirectiveLocation

getFields()​

function getFields(type): unknown[]

Defined in: packages/graphql/src/introspection.ts:386

Returns fields map for a GraphQL schema type.

see getSchemaMap

Parameters​

type​

unknown

the GraphQL schema type to parse.

Returns​

unknown[]

a list of fields of type object.

getOperation()​

function getOperation(operationType?): Record<string, GraphQLOperationType>

Defined in: packages/graphql/src/introspection.ts:362

Returns fields map for a GraphQL operation type (query, mutation, subscription...).

see getSchemaMap

Parameters​

operationType?​

unknown

the operation type to parse.

Returns​

Record<string, GraphQLOperationType>

a map of fields as k/v records.

getSchemaMap()​

function getSchemaMap(schema): SchemaMap

Defined in: packages/graphql/src/introspection.ts:496

Returns an introspection map of the GraphQL schema. This is the entry point for GraphQL-Markdown schema parsing features.

Parameters​

schema​

Maybe<GraphQLSchema>

a GraphQL schema.

Returns​

SchemaMap

a schema map by GraphQL entities (see SchemaEntity).

Example​

import { buildSchema } from "graphql";
import { getSchemaMap } from "@graphql-markdown/utils/graphql";

const schema = buildSchema(`
  interface Record {
    id: String!
  }
  type StudyItem implements Record {
    id: String!
    subject: String!
    duration: Int!
  }
  type Query {
    getStudyItems(subject: String): [StudyItem!]
    getStudyItem(id: String!): StudyItem
  }
  type Mutation {
    addStudyItem(subject: String!, duration: Int!): StudyItem
  }
  type Subscription {
    listStudyItems: [StudyItem!]
  }
`);

const schemaTypeMap = getSchemaMap(schema);

// expected result: {
//   queries: {
//     getStudyItems: GraphQLField,
//     getStudyItem: GraphQLField,
//   },
//   mutations: {
//     addStudyItem: GraphQLField,
//   },
//   subscriptions: {
//     listStudyItems: GraphQLField,
//   }
//   directives: {
//     include: GraphQLDirective,
//     skip: GraphQLDirective,
//     deprecated: GraphQLDirective,
//     specifiedBy: GraphQLDirective,
//   objects: {
//     StudyItem: GraphQLObjectType,
//   unions: {},
//   interfaces: {
//     Record: GraphQLInterfaceType,
//   enums: {},
//   inputs: {},
//   scalars: {
//     String: GraphQLScalarType,
//     Int: GraphQLScalarType,
//     Boolean: GraphQLScalarType,
//   }
// }

getTypeDirectiveArgValue()​

function getTypeDirectiveArgValue(
   directive, 
   node, 
argName): Maybe<string | Record<string, unknown>>

Defined in: packages/graphql/src/introspection.ts:289

Returns one directive's argument's value linked to a GraphQL schema type. It calls getTypeDirectiveValues and returns a matching record.

Parameters​

directive​

GraphQLDirective

a GraphQL directive defined in the schema.

node​

unknown

argName​

string

the name of the GraphQL directive argument to fetch the value from.

Returns​

Maybe<string | Record<string, unknown>>

a record k/v with argName as key and the argument's value.

getTypeDirectiveValues()​

function getTypeDirectiveValues(directive, type): Maybe<Record<string, unknown>>

Defined in: packages/graphql/src/introspection.ts:258

Returns all directive's arguments' values linked to a GraphQL schema type.

Parameters​

directive​

GraphQLDirective

a GraphQL directive defined in the schema.

type​

unknown

the GraphQL schema type to parse.

Returns​

Maybe<Record<string, unknown>>

a record k/v with arguments' name as keys and arguments' value.

getTypeFromSchema()​

function getTypeFromSchema<T>(schema, type): Maybe<Record<string, T>>

Defined in: packages/graphql/src/introspection.ts:61

Returns a map of GraphQL named types from a schema for a defined GraphQL type. When parsing the entities, internal GraphQL entities (starting with __) are excluded.

Type Parameters​

• T

Parameters​

schema​

Maybe<GraphQLSchema>

a GraphQL schema.

type​

unknown

a GraphQL type, eg GraphQLObjectType.

Returns​

Maybe<Record<string, T>>

a map of GraphQL named types for the matching GraphQL type, or undefined if no match.

See​

getSchemaMap

getTypeName()​

function getTypeName(type, defaultName): string

Defined in: packages/graphql/src/introspection.ts:409

Resolves the name of a GraphQL schema type.

Parameters​

type​

unknown

defaultName​

string = ""

optional fallback value if the name resolution fails.

Returns​

string

the type's name, or defaultName.

hasAstNode()​

function hasAstNode<T>(node): node is AstNodeType<T>

Defined in: packages/graphql/src/introspection.ts:109

Type guard for type with an AST node property.

Type Parameters​

• T

Parameters​

node​

T

a GraphQL schema named type.

Returns​

node is AstNodeType<T>

true if the entity has an AST node property, else false.

hasDirective()​

function hasDirective(
   entity, 
   directives, 
   fallback): boolean

Defined in: packages/graphql/src/introspection.ts:188

Checks if a schema entity as a directive belonging to a defined set.

Parameters​

entity​

unknown

a GraphQL schema entity.

directives​

Maybe<GraphQLDirective[]>

a directive name or a list of directive names.

fallback​

boolean = false

default value if the entity type is not a valid location for directives.

Returns​

boolean

true if the entity has at least one directive matching, else false.

isValidDirectiveLocation()​

function isValidDirectiveLocation(entity, directive): boolean

Defined in: packages/graphql/src/introspection.ts:167

Check if a directive can be applied to specific schema entity location.

Parameters​

entity​

unknown

a GraphQL schema entity.

directive​

GraphQLDirective

a directive name.

Returns​

boolean

true if the entity is a valid directive location, else false.