graphql
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A Query Language and Runtime which can target any service.
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@category Introspection */\n\nimport { devAssert } from '../jsutils/devAssert.ts';\nimport { inspect } from '../jsutils/inspect.ts';\nimport { isObjectLike } from '../jsutils/isObjectLike.ts';\nimport { keyValMap } from '../jsutils/keyValMap.ts';\n\nimport { parseConstValue } from '../language/parser.ts';\n\nimport type {\n GraphQLFieldConfig,\n GraphQLFieldConfigMap,\n GraphQLNamedType,\n GraphQLType,\n} from '../type/definition.ts';\nimport {\n assertInterfaceType,\n assertNullableType,\n assertObjectType,\n GraphQLEnumType,\n GraphQLInputObjectType,\n GraphQLInterfaceType,\n GraphQLList,\n GraphQLNonNull,\n GraphQLObjectType,\n GraphQLScalarType,\n GraphQLUnionType,\n isInputType,\n isOutputType,\n} from '../type/definition.ts';\nimport { GraphQLDirective } from '../type/directives.ts';\nimport { introspectionTypes, TypeKind } from '../type/introspection.ts';\nimport { specifiedScalarTypes } from '../type/scalars.ts';\nimport type { GraphQLSchemaValidationOptions } from '../type/schema.ts';\nimport { GraphQLSchema } from '../type/schema.ts';\n\nimport type {\n IntrospectionDirective,\n IntrospectionEnumType,\n IntrospectionField,\n IntrospectionInputObjectType,\n IntrospectionInputValue,\n IntrospectionInterfaceType,\n IntrospectionNamedTypeRef,\n IntrospectionObjectType,\n IntrospectionQuery,\n IntrospectionScalarType,\n IntrospectionType,\n IntrospectionTypeRef,\n IntrospectionUnionType,\n} from './getIntrospectionQuery.ts';\n\n/**\n * Build a GraphQLSchema for use by client tools.\n *\n * Given the result of a client running the introspection query, creates and\n * returns a GraphQLSchema instance which can be then used with all graphql-js\n * tools, but cannot be used to execute a query, as introspection does not\n * represent the \"resolver\", \"parse\" or \"serialize\" functions or any other\n * server-internal mechanisms.\n *\n * This function expects a complete introspection result. Don't forget to check\n * the \"errors\" field of a server response before calling this function.\n * @param introspection - Introspection result data to build from.\n * @param options - Optional configuration for this operation.\n * @returns The client schema represented by the introspection result.\n * @example\n * ```ts\n * import {\n * buildClientSchema,\n * introspectionFromSchema,\n * buildSchema,\n * } from 'graphql/utilities';\n *\n * const schema = buildSchema('type Query { hello: String }');\n * const clientSchema = buildClientSchema(introspectionFromSchema(schema), {\n * assumeValid: true,\n * });\n *\n * clientSchema.getQueryType().name; // => 'Query'\n * ```\n */\nexport function buildClientSchema(\n introspection: IntrospectionQuery,\n options?: GraphQLSchemaValidationOptions,\n): GraphQLSchema {\n // Even though the `introspection` argument is typed, in most cases it's received\n // as an untyped value from the server, so we will do an additional check here.\n devAssert(\n isObjectLike(introspection) && isObjectLike(introspection.__schema),\n `Invalid or incomplete introspection result. Ensure that you are passing \"data\" property of introspection response and no \"errors\" was returned alongside: ${inspect(\n introspection,\n )}.`,\n );\n\n // Get the schema from the introspection result.\n const schemaIntrospection = introspection.__schema;\n\n // Iterate through all types, getting the type definition for each.\n const typeMap = new Map<string, GraphQLNamedType>(\n schemaIntrospection.types.map((typeIntrospection) => [\n typeIntrospection.name,\n buildType(typeIntrospection),\n ]),\n );\n\n // Include standard types only if they are used.\n for (const stdType of [...specifiedScalarTypes, ...introspectionTypes]) {\n if (typeMap.has(stdType.name)) {\n typeMap.set(stdType.name, stdType);\n }\n }\n\n // Get the root Query, Mutation, and Subscription types.\n const queryType =\n schemaIntrospection.queryType != null\n ? getObjectType(schemaIntrospection.queryType)\n : null;\n\n const mutationType =\n schemaIntrospection.mutationType != null\n ? getObjectType(schemaIntrospection.mutationType)\n : null;\n\n const subscriptionType =\n schemaIntrospection.subscriptionType != null\n ? getObjectType(schemaIntrospection.subscriptionType)\n : null;\n\n // Get the directives supported by Introspection, assuming empty-set if\n // directives were not queried for.\n const directives =\n schemaIntrospection.directives != null\n ? schemaIntrospection.directives.map(buildDirective)\n : [];\n\n // Then produce and return a Schema with these types.\n return new GraphQLSchema({\n description: schemaIntrospection.description,\n query: queryType,\n mutation: mutationType,\n subscription: subscriptionType,\n types: [...typeMap.values()],\n directives,\n assumeValid: options?.assumeValid,\n });\n\n // Given a type reference in introspection, return the GraphQLType instance.\n // preferring cached instances before building new instances.\n function getType(typeRef: IntrospectionTypeRef): GraphQLType {\n if (typeRef.kind === TypeKind.LIST) {\n const itemRef = typeRef.ofType;\n if (itemRef == null) {\n throw new Error('Decorated type deeper than introspection query.');\n }\n return new GraphQLList(getType(itemRef));\n }\n if (typeRef.kind === TypeKind.NON_NULL) {\n const nullableRef = typeRef.ofType;\n if (nullableRef == null) {\n throw new Error('Decorated type deeper than introspection query.');\n }\n const nullableType = getType(nullableRef);\n return new GraphQLNonNull(assertNullableType(nullableType));\n }\n return getNamedType(typeRef);\n }\n\n function getNamedType(typeRef: IntrospectionNamedTypeRef): GraphQLNamedType {\n const typeName = typeRef.name;\n if (!typeName) {\n throw new Error(`Unknown type reference: ${inspect(typeRef)}.`);\n }\n\n const type = typeMap.get(typeName);\n if (type == null) {\n throw new Error(\n `Invalid or incomplete schema, unknown type: ${typeName}. Ensure that a full introspection query is used in order to build a client schema.`,\n );\n }\n\n return type;\n }\n\n function getObjectType(\n typeRef: IntrospectionNamedTypeRef<IntrospectionObjectType>,\n ): GraphQLObjectType {\n return assertObjectType(getNamedType(typeRef));\n }\n\n function getInterfaceType(\n typeRef: IntrospectionNamedTypeRef<IntrospectionInterfaceType>,\n ): GraphQLInterfaceType {\n return assertInterfaceType(getNamedType(typeRef));\n }\n\n // Given a type's introspection result, construct the correct\n // GraphQLType instance.\n function buildType(type: IntrospectionType): GraphQLNamedType {\n switch (type.kind) {\n case TypeKind.SCALAR:\n return buildScalarDef(type);\n case TypeKind.OBJECT:\n return buildObjectDef(type);\n case TypeKind.INTERFACE:\n return buildInterfaceDef(type);\n case TypeKind.UNION:\n return buildUnionDef(type);\n case TypeKind.ENUM:\n return buildEnumDef(type);\n case TypeKind.INPUT_OBJECT:\n return buildInputObjectDef(type);\n default:\n // TypeScript considers this unreachable, but invalid runtime input can reach it.\n // Note: we include a default case rather than throwing after the switch to avoid\n // the use of a @ts-expect-error statement.\n throw new Error(\n `Invalid or incomplete introspection result. Ensure that a full introspection query is used in order to build a client schema: ${inspect(\n type,\n )}.`,\n );\n }\n }\n\n function buildScalarDef(\n scalarIntrospection: IntrospectionScalarType,\n ): GraphQLScalarType {\n return new GraphQLScalarType({\n name: scalarIntrospection.name,\n description: scalarIntrospection.description,\n specifiedByURL: scalarIntrospection.specifiedByURL,\n });\n }\n\n function buildImplementationsList(\n implementingIntrospection:\n | IntrospectionObjectType\n | IntrospectionInterfaceType,\n ): Array<GraphQLInterfaceType> {\n // TODO: Temporary workaround until GraphQL ecosystem will fully support\n // 'interfaces' on interface types.\n if (\n implementingIntrospection.interfaces === null &&\n implementingIntrospection.kind === TypeKind.INTERFACE\n ) {\n return [];\n }\n\n if (implementingIntrospection.interfaces == null) {\n const implementingIntrospectionStr = inspect(implementingIntrospection);\n throw new Error(\n `Introspection result missing interfaces: ${implementingIntrospectionStr}.`,\n );\n }\n\n return implementingIntrospection.interfaces.map(getInterfaceType);\n }\n\n function buildObjectDef(\n objectIntrospection: IntrospectionObjectType,\n ): GraphQLObjectType {\n return new GraphQLObjectType({\n name: objectIntrospection.name,\n description: objectIntrospection.description,\n interfaces: () => buildImplementationsList(objectIntrospection),\n fields: () => buildFieldDefMap(objectIntrospection),\n });\n }\n\n function buildInterfaceDef(\n interfaceIntrospection: IntrospectionInterfaceType,\n ): GraphQLInterfaceType {\n return new GraphQLInterfaceType({\n name: interfaceIntrospection.name,\n description: interfaceIntrospection.description,\n interfaces: () => buildImplementationsList(interfaceIntrospection),\n fields: () => buildFieldDefMap(interfaceIntrospection),\n });\n }\n\n function buildUnionDef(\n unionIntrospection: IntrospectionUnionType,\n ): GraphQLUnionType {\n if (unionIntrospection.possibleTypes == null) {\n const unionIntrospectionStr = inspect(unionIntrospection);\n throw new Error(\n `Introspection result missing possibleTypes: ${unionIntrospectionStr}.`,\n );\n }\n return new GraphQLUnionType({\n name: unionIntrospection.name,\n description: unionIntrospection.description,\n types: () => unionIntrospection.possibleTypes.map(getObjectType),\n });\n }\n\n function buildEnumDef(\n enumIntrospection: IntrospectionEnumType,\n ): GraphQLEnumType {\n if (enumIntrospection.enumValues == null) {\n const enumIntrospectionStr = inspect(enumIntrospection);\n throw new Error(\n `Introspection result missing enumValues: ${enumIntrospectionStr}.`,\n );\n }\n return new GraphQLEnumType({\n name: enumIntrospection.name,\n description: enumIntrospection.description,\n values: keyValMap(\n enumIntrospection.enumValues,\n (valueIntrospection) => valueIntrospection.name,\n (valueIntrospection) => ({\n description: valueIntrospection.description,\n deprecationReason: valueIntrospection.deprecationReason,\n }),\n ),\n });\n }\n\n function buildInputObjectDef(\n inputObjectIntrospection: IntrospectionInputObjectType,\n ): GraphQLInputObjectType {\n if (inputObjectIntrospection.inputFields == null) {\n const inputObjectIntrospectionStr = inspect(inputObjectIntrospection);\n throw new Error(\n `Introspection result missing inputFields: ${inputObjectIntrospectionStr}.`,\n );\n }\n return new GraphQLInputObjectType({\n name: inputObjectIntrospection.name,\n description: inputObjectIntrospection.description,\n fields: () => buildInputValueDefMap(inputObjectIntrospection.inputFields),\n isOneOf: inputObjectIntrospection.isOneOf,\n });\n }\n\n function buildFieldDefMap(\n typeIntrospection: IntrospectionObjectType | IntrospectionInterfaceType,\n ): GraphQLFieldConfigMap<unknown, unknown> {\n if (typeIntrospection.fields == null) {\n throw new Error(\n `Introspection result missing fields: ${inspect(typeIntrospection)}.`,\n );\n }\n\n return keyValMap(\n typeIntrospection.fields,\n (fieldIntrospection) => fieldIntrospection.name,\n buildField,\n );\n }\n\n function buildField(\n fieldIntrospection: IntrospectionField,\n ): GraphQLFieldConfig<unknown, unknown> {\n const type = getType(fieldIntrospection.type);\n if (!isOutputType(type)) {\n const typeStr = inspect(type);\n throw new Error(\n `Introspection must provide output type for fields, but received: ${typeStr}.`,\n );\n }\n\n if (fieldIntrospection.args == null) {\n const fieldIntrospectionStr = inspect(fieldIntrospection);\n throw new Error(\n `Introspection result missing field args: ${fieldIntrospectionStr}.`,\n );\n }\n\n return {\n description: fieldIntrospection.description,\n deprecationReason: fieldIntrospection.deprecationReason,\n type,\n args: buildInputValueDefMap(fieldIntrospection.args),\n };\n }\n\n function buildInputValueDefMap(\n inputValueIntrospections: ReadonlyArray<IntrospectionInputValue>,\n ) {\n return keyValMap(\n inputValueIntrospections,\n (inputValue) => inputValue.name,\n buildInputValue,\n );\n }\n\n function buildInputValue(inputValueIntrospection: IntrospectionInputValue) {\n const type = getType(inputValueIntrospection.type);\n if (!isInputType(type)) {\n const typeStr = inspect(type);\n throw new Error(\n `Introspection must provide input type for arguments, but received: ${typeStr}.`,\n );\n }\n\n return {\n description: inputValueIntrospection.description,\n type,\n default:\n inputValueIntrospection.defaultValue != null\n ? { literal: parseConstValue(inputValueIntrospection.defaultValue) }\n : undefined,\n deprecationReason: inputValueIntrospection.deprecationReason,\n };\n }\n\n function buildDirective(\n directiveIntrospection: IntrospectionDirective,\n ): GraphQLDirective {\n if (directiveIntrospection.args == null) {\n const directiveIntrospectionStr = inspect(directiveIntrospection);\n throw new Error(\n `Introspection result missing directive args: ${directiveIntrospectionStr}.`,\n );\n }\n if (directiveIntrospection.locations == null) {\n const directiveIntrospectionStr = inspect(directiveIntrospection);\n throw new Error(\n `Introspection result missing directive locations: ${directiveIntrospectionStr}.`,\n );\n }\n return new GraphQLDirective({\n name: directiveIntrospection.name,\n description: directiveIntrospection.description,\n isRepeatable: directiveIntrospection.isRepeatable,\n deprecationReason: directiveIntrospection.deprecationReason,\n locations: directiveIntrospection.locations.slice(),\n args: buildInputValueDefMap(directiveIntrospection.args),\n });\n }\n}\n"]}