graphql
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A Query Language and Runtime which can target any service.
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@category Type Info */\n\nimport type { Maybe } from '../jsutils/Maybe.ts';\n\nimport type {\n ASTNode,\n DocumentNode,\n FragmentDefinitionNode,\n VariableDefinitionNode,\n} from '../language/ast.ts';\nimport { isNode } from '../language/ast.ts';\nimport { Kind } from '../language/kinds.ts';\nimport type { ASTVisitor } from '../language/visitor.ts';\nimport { getEnterLeaveForKind } from '../language/visitor.ts';\n\nimport type {\n GraphQLArgument,\n GraphQLCompositeType,\n GraphQLEnumValue,\n GraphQLField,\n GraphQLInputField,\n GraphQLInputType,\n GraphQLOutputType,\n GraphQLType,\n} from '../type/definition.ts';\nimport {\n getNamedType,\n getNullableType,\n isCompositeType,\n isEnumType,\n isInputObjectType,\n isInputType,\n isListType,\n isObjectType,\n isOutputType,\n} from '../type/definition.ts';\nimport type { GraphQLDirective } from '../type/directives.ts';\nimport type { GraphQLSchema } from '../type/schema.ts';\n\nimport { typeFromAST } from './typeFromAST.ts';\n\n/** @internal */\nexport interface FragmentSignature {\n readonly definition: FragmentDefinitionNode;\n readonly variableDefinitions: Map<string, VariableDefinitionNode>;\n}\n\n/**\n * TypeInfo is a utility class which, given a GraphQL schema, can keep track\n * of the current field and type definitions at any point in a GraphQL document\n * AST during a recursive descent by calling `enter(node)` and `leave(node)`.\n */\nexport class TypeInfo {\n private _schema: GraphQLSchema;\n private _typeStack: Array<Maybe<GraphQLOutputType>>;\n private _parentTypeStack: Array<Maybe<GraphQLCompositeType>>;\n private _inputTypeStack: Array<Maybe<GraphQLInputType>>;\n private _fieldDefStack: Array<Maybe<GraphQLField<unknown, unknown>>>;\n private _defaultValueStack: Array<unknown>;\n private _directive: Maybe<GraphQLDirective>;\n private _argument: Maybe<GraphQLArgument>;\n private _enumValue: Maybe<GraphQLEnumValue>;\n private _fragmentSignaturesByName: (\n fragmentName: string,\n ) => Maybe<FragmentSignature>;\n\n private _fragmentSignature: Maybe<FragmentSignature>;\n private _fragmentArgument: Maybe<VariableDefinitionNode>;\n\n /**\n * Creates a TypeInfo instance.\n * @param schema - Schema used for type lookups.\n * @param initialType - Optional type to use at the start of traversal.\n * @param fragmentSignatures - Fragment signatures available during traversal.\n * @example\n * ```ts\n * // Track field types during a visitWithTypeInfo traversal.\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema } from 'graphql/utilities';\n * import { TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting: String\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * const seenTypes = [];\n *\n * visit(\n * parse('{ greeting }'),\n * visitWithTypeInfo(typeInfo, {\n * Field: () => {\n * seenTypes.push(String(typeInfo.getType()));\n * },\n * }),\n * );\n *\n * seenTypes; // => ['String']\n * ```\n * @example\n * ```ts\n * // This variant starts from an initial type and supplies fragment signatures.\n * import { Kind, parse } from 'graphql/language';\n * import { buildSchema, TypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting(name: String): String\n * }\n * `);\n * const fragmentDocument = parse(\n * 'fragment GreetingFields($name: String) on Query { greeting(name: $name) }',\n * { experimentalFragmentArguments: true },\n * );\n * const fragmentDefinition = fragmentDocument.definitions[0];\n * const variableDefinition = fragmentDefinition.variableDefinitions[0];\n * const typeInfo = new TypeInfo(schema, schema.getQueryType(), (name) =>\n * name === 'GreetingFields'\n * ? {\n * definition: fragmentDefinition,\n * variableDefinitions: new Map([['name', variableDefinition]]),\n * }\n * : undefined,\n * );\n *\n * typeInfo.enter({\n * kind: Kind.SELECTION_SET,\n * selections: [],\n * });\n * typeInfo.enter({\n * kind: Kind.FRAGMENT_SPREAD,\n * name: { kind: Kind.NAME, value: 'GreetingFields' },\n * arguments: [],\n * directives: [],\n * });\n *\n * String(typeInfo.getParentType()); // => 'Query'\n * typeInfo.getFragmentSignature()?.definition.name.value; // => 'GreetingFields'\n * ```\n */\n constructor(\n schema: GraphQLSchema,\n /**\n * Initial type may be provided in rare cases to facilitate traversals\n * beginning somewhere other than documents.\n */\n initialType?: Maybe<GraphQLType>,\n fragmentSignatures?: Maybe<\n (fragmentName: string) => Maybe<FragmentSignature>\n >,\n ) {\n this._schema = schema;\n this._typeStack = [];\n this._parentTypeStack = [];\n this._inputTypeStack = [];\n this._fieldDefStack = [];\n this._defaultValueStack = [];\n this._directive = null;\n this._argument = null;\n this._enumValue = null;\n this._fragmentSignaturesByName = fragmentSignatures ?? (() => null);\n this._fragmentSignature = null;\n this._fragmentArgument = null;\n if (initialType) {\n if (isInputType(initialType)) {\n this._inputTypeStack.push(initialType);\n }\n if (isCompositeType(initialType)) {\n this._parentTypeStack.push(initialType);\n }\n if (isOutputType(initialType)) {\n this._typeStack.push(initialType);\n }\n }\n }\n\n /**\n * Returns the value used by `Object.prototype.toString`.\n * @returns The built-in string tag for this object.\n */\n get [Symbol.toStringTag](): string {\n return 'TypeInfo';\n }\n\n /**\n * Returns the current output type at this point in traversal.\n * @returns The current output type, if known.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * viewer: User\n * }\n *\n * type User {\n * name: String\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * const fieldTypes = {};\n *\n * visit(\n * parse('{ viewer { name } }'),\n * visitWithTypeInfo(typeInfo, {\n * Field: (node) => {\n * fieldTypes[node.name.value] = String(typeInfo.getType());\n * },\n * }),\n * );\n *\n * fieldTypes; // => { viewer: 'User', name: 'String' }\n * ```\n */\n getType(): Maybe<GraphQLOutputType> {\n return this._typeStack.at(-1);\n }\n\n /**\n * Returns the current parent composite type.\n * @returns The current parent composite type, if known.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * viewer: User\n * }\n *\n * type User {\n * name: String\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * const parentTypes = {};\n *\n * visit(\n * parse('{ viewer { name } }'),\n * visitWithTypeInfo(typeInfo, {\n * Field: (node) => {\n * parentTypes[node.name.value] = String(typeInfo.getParentType());\n * },\n * }),\n * );\n *\n * parentTypes; // => { viewer: 'Query', name: 'User' }\n * ```\n */\n getParentType(): Maybe<GraphQLCompositeType> {\n return this._parentTypeStack.at(-1);\n }\n\n /**\n * Returns the current input type at this point in traversal.\n * @returns The current input type, if known.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * reviews(stars: Int!, sort: Sort = NEWEST): [String]\n * }\n *\n * enum Sort {\n * NEWEST\n * OLDEST\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * const inputTypes = {};\n *\n * visit(\n * parse('{ reviews(stars: 5, sort: OLDEST) }'),\n * visitWithTypeInfo(typeInfo, {\n * Argument: (node) => {\n * inputTypes[node.name.value] = String(typeInfo.getInputType());\n * },\n * }),\n * );\n *\n * inputTypes; // => { stars: 'Int!', sort: 'Sort' }\n * ```\n */\n getInputType(): Maybe<GraphQLInputType> {\n return this._inputTypeStack.at(-1);\n }\n\n // Note: continues to expose the closest enclosing valid input type if\n // traversal descends into syntax with no corresponding GraphQL input type.\n /**\n * Returns the parent input type for the current input position.\n * @returns The parent input type, if known.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * input ReviewFilter {\n * stars: Int!\n * }\n *\n * type Query {\n * reviews(filter: ReviewFilter): [String]\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * const parentInputTypes = {};\n *\n * visit(\n * parse('{ reviews(filter: { stars: 5 }) }'),\n * visitWithTypeInfo(typeInfo, {\n * ObjectField: (node) => {\n * parentInputTypes[node.name.value] = String(typeInfo.getParentInputType());\n * },\n * }),\n * );\n *\n * parentInputTypes; // => { stars: 'ReviewFilter' }\n * ```\n */\n getParentInputType(): Maybe<GraphQLInputType> {\n return this._inputTypeStack.at(-2);\n }\n\n /**\n * Returns the current field definition.\n * @returns The current field definition, if known.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting: String\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * let fieldName;\n *\n * visit(\n * parse('{ greeting }'),\n * visitWithTypeInfo(typeInfo, {\n * Field: () => {\n * fieldName = typeInfo.getFieldDef()?.name;\n * },\n * }),\n * );\n *\n * fieldName; // => 'greeting'\n * ```\n */\n getFieldDef(): Maybe<GraphQLField<unknown, unknown>> {\n return this._fieldDefStack.at(-1);\n }\n\n /**\n * Returns the default input representation for the current input position.\n * @returns The current default input, if one is available.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * reviews(limit: Int = 10): [String]\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * let defaultLimit;\n *\n * visit(\n * parse('{ reviews(limit: 5) }'),\n * visitWithTypeInfo(typeInfo, {\n * Argument: () => {\n * defaultLimit = typeInfo.getDefaultValue();\n * },\n * }),\n * );\n *\n * defaultLimit; // => { literal: { kind: 'IntValue', value: '10' } }\n * ```\n */\n getDefaultValue(): unknown {\n return this._defaultValueStack.at(-1);\n }\n\n /**\n * Returns the current directive definition.\n * @returns The current directive definition, if known.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting: String\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * let directiveName;\n *\n * visit(\n * parse('{ greeting @include(if: true) }'),\n * visitWithTypeInfo(typeInfo, {\n * Directive: () => {\n * directiveName = typeInfo.getDirective()?.name;\n * },\n * }),\n * );\n *\n * directiveName; // => 'include'\n * ```\n */\n getDirective(): Maybe<GraphQLDirective> {\n return this._directive;\n }\n\n /**\n * Returns the current argument definition.\n * @returns The current argument definition, if known.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * reviews(limit: Int = 10): [String]\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * let argumentName;\n *\n * visit(\n * parse('{ reviews(limit: 5) }'),\n * visitWithTypeInfo(typeInfo, {\n * Argument: () => {\n * argumentName = typeInfo.getArgument()?.name;\n * },\n * }),\n * );\n *\n * argumentName; // => 'limit'\n * ```\n */\n getArgument(): Maybe<GraphQLArgument> {\n return this._argument;\n }\n\n /**\n * Returns the current fragment signature.\n * @returns The fragment signature for the current fragment definition.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting: String\n * }\n * `);\n * const document = parse(\n * `\n * {\n * ...GreetingFields\n * }\n *\n * fragment GreetingFields on Query {\n * greeting\n * }\n * `,\n * { experimentalFragmentArguments: true },\n * );\n * const typeInfo = new TypeInfo(schema);\n * let fragmentName;\n *\n * visit(\n * document,\n * visitWithTypeInfo(typeInfo, {\n * FragmentSpread: () => {\n * fragmentName = typeInfo.getFragmentSignature()?.definition.name.value;\n * },\n * }),\n * );\n *\n * fragmentName; // => 'GreetingFields'\n * ```\n */\n getFragmentSignature(): Maybe<FragmentSignature> {\n return this._fragmentSignature;\n }\n\n /**\n * Returns the function used to look up fragment signatures by name.\n * @returns A function that maps fragment names to fragment signatures.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting: String\n * }\n * `);\n * const document = parse(\n * `\n * {\n * ...GreetingFields\n * }\n *\n * fragment GreetingFields on Query {\n * greeting\n * }\n * `,\n * { experimentalFragmentArguments: true },\n * );\n * const typeInfo = new TypeInfo(schema);\n * let fragmentName;\n *\n * visit(\n * document,\n * visitWithTypeInfo(typeInfo, {\n * Document: () => {\n * const getFragmentSignature = typeInfo.getFragmentSignatureByName();\n * fragmentName =\n * getFragmentSignature('GreetingFields')?.definition.name.value;\n * },\n * }),\n * );\n *\n * fragmentName; // => 'GreetingFields'\n * ```\n */\n getFragmentSignatureByName(): (\n fragmentName: string,\n ) => Maybe<FragmentSignature> {\n return this._fragmentSignaturesByName;\n }\n\n /**\n * Returns the current fragment argument definition.\n * @returns The variable definition for the current fragment argument.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting(name: String): String\n * }\n * `);\n * const document = parse(\n * `\n * {\n * ...GreetingFields(name: \"Ada\")\n * }\n *\n * fragment GreetingFields($name: String) on Query {\n * greeting(name: $name)\n * }\n * `,\n * { experimentalFragmentArguments: true },\n * );\n * const typeInfo = new TypeInfo(schema);\n * let argumentName;\n *\n * visit(\n * document,\n * visitWithTypeInfo(typeInfo, {\n * FragmentArgument: () => {\n * argumentName = typeInfo.getFragmentArgument()?.variable.name.value;\n * },\n * }),\n * );\n *\n * argumentName; // => 'name'\n * ```\n */\n getFragmentArgument(): Maybe<VariableDefinitionNode> {\n return this._fragmentArgument;\n }\n\n /**\n * Returns the current enum value definition.\n * @returns The current enum value definition, if known.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * enum Sort {\n * NEWEST\n * OLDEST\n * }\n *\n * type Query {\n * reviews(sort: Sort = NEWEST): [String]\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * let enumValueName;\n *\n * visit(\n * parse('{ reviews(sort: OLDEST) }'),\n * visitWithTypeInfo(typeInfo, {\n * EnumValue: () => {\n * enumValueName = typeInfo.getEnumValue()?.name;\n * },\n * }),\n * );\n *\n * enumValueName; // => 'OLDEST'\n * ```\n */\n getEnumValue(): Maybe<GraphQLEnumValue> {\n return this._enumValue;\n }\n\n /**\n * Updates this TypeInfo instance for an entered AST node.\n * @param node - AST node being entered.\n * @returns Nothing.\n * @example\n * ```ts\n * import { Kind, parse } from 'graphql/language';\n * import { buildSchema, TypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting: String\n * }\n * `);\n * const document = parse('{ greeting }');\n * const operation = document.definitions[0];\n * const selectionSet = operation.selectionSet;\n * const field = selectionSet.selections[0];\n * const typeInfo = new TypeInfo(schema);\n *\n * typeInfo.enter(operation);\n * typeInfo.enter(selectionSet);\n * typeInfo.enter(field);\n *\n * field.kind; // => Kind.FIELD\n * typeInfo.getParentType()?.name; // => 'Query'\n * String(typeInfo.getType()); // => 'String'\n * ```\n */\n enter(node: ASTNode): void {\n const schema = this._schema;\n // Note: many of the types below are explicitly typed as \"unknown\" to drop\n // any assumptions of a valid schema to ensure runtime types are properly\n // checked before continuing since TypeInfo is used as part of validation\n // which occurs before guarantees of schema and document validity.\n switch (node.kind) {\n case Kind.DOCUMENT: {\n const fragmentSignatures = getFragmentSignatures(node);\n this._fragmentSignaturesByName = (fragmentName: string) =>\n fragmentSignatures.get(fragmentName);\n break;\n }\n case Kind.SELECTION_SET: {\n const namedType: unknown = getNamedType(this.getType());\n this._parentTypeStack.push(\n isCompositeType(namedType) ? namedType : undefined,\n );\n break;\n }\n case Kind.FIELD: {\n const parentType = this.getParentType();\n let fieldDef;\n let fieldType: unknown;\n if (parentType) {\n fieldDef = schema.getField(parentType, node.name.value);\n if (fieldDef) {\n fieldType = fieldDef.type;\n }\n }\n this._fieldDefStack.push(fieldDef);\n this._typeStack.push(isOutputType(fieldType) ? fieldType : undefined);\n break;\n }\n case Kind.DIRECTIVE:\n this._directive = schema.getDirective(node.name.value);\n break;\n case Kind.OPERATION_DEFINITION: {\n const rootType = schema.getRootType(node.operation);\n this._typeStack.push(isObjectType(rootType) ? rootType : undefined);\n break;\n }\n case Kind.FRAGMENT_SPREAD: {\n this._fragmentSignature = this.getFragmentSignatureByName()(\n node.name.value,\n );\n break;\n }\n case Kind.INLINE_FRAGMENT:\n case Kind.FRAGMENT_DEFINITION: {\n const typeConditionAST = node.typeCondition;\n const outputType: unknown = typeConditionAST\n ? typeFromAST(schema, typeConditionAST)\n : getNamedType(this.getType());\n this._typeStack.push(isOutputType(outputType) ? outputType : undefined);\n break;\n }\n case Kind.VARIABLE_DEFINITION: {\n const inputType: unknown = typeFromAST(schema, node.type);\n this._inputTypeStack.push(\n isInputType(inputType) ? inputType : undefined,\n );\n break;\n }\n case Kind.ARGUMENT: {\n let argDef;\n let argType: unknown;\n const fieldOrDirective = this.getDirective() ?? this.getFieldDef();\n if (fieldOrDirective) {\n argDef = fieldOrDirective.args.find(\n (arg) => arg.name === node.name.value,\n );\n if (argDef) {\n argType = argDef.type;\n }\n }\n this._argument = argDef;\n this._defaultValueStack.push(\n argDef?.default ?? argDef?.defaultValue ?? undefined,\n );\n this._inputTypeStack.push(isInputType(argType) ? argType : undefined);\n break;\n }\n case Kind.FRAGMENT_ARGUMENT: {\n const fragmentSignature = this.getFragmentSignature();\n const argDef = fragmentSignature?.variableDefinitions.get(\n node.name.value,\n );\n this._fragmentArgument = argDef;\n let argType: unknown;\n if (argDef) {\n argType = typeFromAST(this._schema, argDef.type);\n }\n this._inputTypeStack.push(isInputType(argType) ? argType : undefined);\n break;\n }\n case Kind.LIST: {\n const listType: unknown = getNullableType(this.getInputType());\n const itemType: unknown = isListType(listType)\n ? listType.ofType\n : undefined;\n // List positions never have a default value.\n this._defaultValueStack.push(undefined);\n this._inputTypeStack.push(isInputType(itemType) ? itemType : undefined);\n break;\n }\n case Kind.OBJECT_FIELD: {\n const objectType: unknown = getNamedType(this.getInputType());\n let inputFieldType: GraphQLInputType | undefined;\n let inputField: GraphQLInputField | undefined;\n if (isInputObjectType(objectType)) {\n inputField = objectType.getFields()[node.name.value];\n if (inputField != null) {\n inputFieldType = inputField.type;\n }\n }\n this._defaultValueStack.push(\n inputField?.default ?? inputField?.defaultValue ?? undefined,\n );\n this._inputTypeStack.push(\n isInputType(inputFieldType) ? inputFieldType : undefined,\n );\n break;\n }\n case Kind.ENUM: {\n const enumType: unknown = getNamedType(this.getInputType());\n let enumValue;\n if (isEnumType(enumType)) {\n enumValue = enumType.getValue(node.value);\n }\n this._enumValue = enumValue;\n break;\n }\n default:\n // Ignore other nodes\n }\n }\n\n /**\n * Updates this TypeInfo instance for a left AST node.\n * @param node - AST node being entered.\n * @returns Nothing.\n * @example\n * ```ts\n * import { parse } from 'graphql/language';\n * import { buildSchema, TypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting: String\n * }\n * `);\n * const document = parse('{ greeting }');\n * const operation = document.definitions[0];\n * const selectionSet = operation.selectionSet;\n * const field = selectionSet.selections[0];\n * const typeInfo = new TypeInfo(schema);\n *\n * typeInfo.enter(operation);\n * typeInfo.enter(selectionSet);\n * typeInfo.enter(field);\n * String(typeInfo.getType()); // => 'String'\n *\n * typeInfo.leave(field);\n * typeInfo.getType(); // => undefined\n * ```\n */\n leave(node: ASTNode): void {\n switch (node.kind) {\n case Kind.DOCUMENT:\n this._fragmentSignaturesByName = () => null;\n break;\n case Kind.SELECTION_SET:\n this._parentTypeStack.pop();\n break;\n case Kind.FIELD:\n this._fieldDefStack.pop();\n this._typeStack.pop();\n break;\n case Kind.DIRECTIVE:\n this._directive = null;\n break;\n case Kind.FRAGMENT_SPREAD:\n this._fragmentSignature = null;\n break;\n case Kind.OPERATION_DEFINITION:\n case Kind.INLINE_FRAGMENT:\n case Kind.FRAGMENT_DEFINITION:\n this._typeStack.pop();\n break;\n case Kind.VARIABLE_DEFINITION:\n this._inputTypeStack.pop();\n break;\n case Kind.ARGUMENT:\n this._argument = null;\n this._defaultValueStack.pop();\n this._inputTypeStack.pop();\n break;\n case Kind.FRAGMENT_ARGUMENT: {\n this._fragmentArgument = null;\n this._defaultValueStack.pop();\n this._inputTypeStack.pop();\n break;\n }\n case Kind.LIST:\n case Kind.OBJECT_FIELD:\n this._defaultValueStack.pop();\n this._inputTypeStack.pop();\n break;\n case Kind.ENUM:\n this._enumValue = null;\n break;\n default:\n // Ignore other nodes\n }\n }\n}\n\nfunction getFragmentSignatures(\n document: DocumentNode,\n): Map<string, FragmentSignature> {\n const fragmentSignatures = new Map<string, FragmentSignature>();\n for (const definition of document.definitions) {\n if (definition.kind === Kind.FRAGMENT_DEFINITION) {\n const variableDefinitions = new Map<string, VariableDefinitionNode>();\n if (definition.variableDefinitions) {\n for (const varDef of definition.variableDefinitions) {\n variableDefinitions.set(varDef.variable.name.value, varDef);\n }\n }\n const signature = { definition, variableDefinitions };\n fragmentSignatures.set(definition.name.value, signature);\n }\n }\n return fragmentSignatures;\n}\n\n/**\n * Creates a new visitor instance which maintains a provided TypeInfo instance\n * along with visiting visitor.\n * @param typeInfo - TypeInfo instance to update during traversal.\n * @param visitor - Visitor callbacks to wrap with TypeInfo updates.\n * @returns A visitor that keeps TypeInfo in sync while delegating callbacks.\n * @example\n * ```ts\n * import { parse, visit } from 'graphql/language';\n * import { buildSchema, TypeInfo, visitWithTypeInfo } from 'graphql/utilities';\n *\n * const schema = buildSchema(`\n * type Query {\n * greeting: String\n * }\n * `);\n * const typeInfo = new TypeInfo(schema);\n * const fields = [];\n *\n * visit(\n * parse('{ greeting }'),\n * visitWithTypeInfo(typeInfo, {\n * Field: (node) => {\n * fields.push({\n * name: node.name.value,\n * parentType: String(typeInfo.getParentType()),\n * type: String(typeInfo.getType()),\n * });\n * },\n * }),\n * );\n *\n * fields; // => [{ name: 'greeting', parentType: 'Query', type: 'String' }]\n * ```\n */\nexport function visitWithTypeInfo(\n typeInfo: TypeInfo,\n visitor: ASTVisitor,\n): ASTVisitor {\n return {\n enter(...args) {\n const node = args[0];\n typeInfo.enter(node);\n const fn = getEnterLeaveForKind(visitor, node.kind).enter;\n if (fn) {\n const result = fn.apply(visitor, args);\n if (result !== undefined) {\n typeInfo.leave(node);\n if (isNode(result)) {\n typeInfo.enter(result);\n }\n }\n return result;\n }\n },\n leave(...args) {\n const node = args[0];\n const fn = getEnterLeaveForKind(visitor, node.kind).leave;\n let result;\n if (fn) {\n result = fn.apply(visitor, args);\n }\n typeInfo.leave(node);\n return result;\n },\n };\n}\n"]}