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+// @flow strict
+import objectValues from '../polyfills/objectValues';
+
+import inspect from '../jsutils/inspect';
+import devAssert from '../jsutils/devAssert';
+import keyValMap from '../jsutils/keyValMap';
+import isObjectLike from '../jsutils/isObjectLike';
+
+import { parseValue } from '../language/parser';
+
+import type { GraphQLSchemaValidationOptions } from '../type/schema';
+import type {
+  GraphQLType,
+  GraphQLNamedType,
+  GraphQLFieldConfig,
+  GraphQLFieldConfigMap,
+} from '../type/definition';
+import { GraphQLSchema } from '../type/schema';
+import { GraphQLDirective } from '../type/directives';
+import { specifiedScalarTypes } from '../type/scalars';
+import { introspectionTypes, TypeKind } from '../type/introspection';
+import {
+  isInputType,
+  isOutputType,
+  GraphQLList,
+  GraphQLNonNull,
+  GraphQLScalarType,
+  GraphQLObjectType,
+  GraphQLInterfaceType,
+  GraphQLUnionType,
+  GraphQLEnumType,
+  GraphQLInputObjectType,
+  assertNullableType,
+  assertObjectType,
+  assertInterfaceType,
+} from '../type/definition';
+
+import type {
+  IntrospectionQuery,
+  IntrospectionDirective,
+  IntrospectionField,
+  IntrospectionInputValue,
+  IntrospectionType,
+  IntrospectionScalarType,
+  IntrospectionObjectType,
+  IntrospectionInterfaceType,
+  IntrospectionUnionType,
+  IntrospectionEnumType,
+  IntrospectionInputObjectType,
+  IntrospectionTypeRef,
+  IntrospectionNamedTypeRef,
+} from './getIntrospectionQuery';
+import { valueFromAST } from './valueFromAST';
+
+/**
+ * Build a GraphQLSchema for use by client tools.
+ *
+ * Given the result of a client running the introspection query, creates and
+ * returns a GraphQLSchema instance which can be then used with all graphql-js
+ * tools, but cannot be used to execute a query, as introspection does not
+ * represent the "resolver", "parse" or "serialize" functions or any other
+ * server-internal mechanisms.
+ *
+ * This function expects a complete introspection result. Don't forget to check
+ * the "errors" field of a server response before calling this function.
+ */
+export function buildClientSchema(
+  introspection: IntrospectionQuery,
+  options?: GraphQLSchemaValidationOptions,
+): GraphQLSchema {
+  devAssert(
+    isObjectLike(introspection) && isObjectLike(introspection.__schema),
+    `Invalid or incomplete introspection result. Ensure that you are passing "data" property of introspection response and no "errors" was returned alongside: ${inspect(
+      introspection,
+    )}.`,
+  );
+
+  // Get the schema from the introspection result.
+  const schemaIntrospection = introspection.__schema;
+
+  // Iterate through all types, getting the type definition for each.
+  const typeMap = keyValMap(
+    schemaIntrospection.types,
+    (typeIntrospection) => typeIntrospection.name,
+    (typeIntrospection) => buildType(typeIntrospection),
+  );
+
+  // Include standard types only if they are used.
+  for (const stdType of [...specifiedScalarTypes, ...introspectionTypes]) {
+    if (typeMap[stdType.name]) {
+      typeMap[stdType.name] = stdType;
+    }
+  }
+
+  // Get the root Query, Mutation, and Subscription types.
+  const queryType = schemaIntrospection.queryType
+    ? getObjectType(schemaIntrospection.queryType)
+    : null;
+
+  const mutationType = schemaIntrospection.mutationType
+    ? getObjectType(schemaIntrospection.mutationType)
+    : null;
+
+  const subscriptionType = schemaIntrospection.subscriptionType
+    ? getObjectType(schemaIntrospection.subscriptionType)
+    : null;
+
+  // Get the directives supported by Introspection, assuming empty-set if
+  // directives were not queried for.
+  const directives = schemaIntrospection.directives
+    ? schemaIntrospection.directives.map(buildDirective)
+    : [];
+
+  // Then produce and return a Schema with these types.
+  return new GraphQLSchema({
+    description: schemaIntrospection.description,
+    query: queryType,
+    mutation: mutationType,
+    subscription: subscriptionType,
+    types: objectValues(typeMap),
+    directives,
+    assumeValid: options?.assumeValid,
+  });
+
+  // Given a type reference in introspection, return the GraphQLType instance.
+  // preferring cached instances before building new instances.
+  function getType(typeRef: IntrospectionTypeRef): GraphQLType {
+    if (typeRef.kind === TypeKind.LIST) {
+      const itemRef = typeRef.ofType;
+      if (!itemRef) {
+        throw new Error('Decorated type deeper than introspection query.');
+      }
+      return new GraphQLList(getType(itemRef));
+    }
+    if (typeRef.kind === TypeKind.NON_NULL) {
+      const nullableRef = typeRef.ofType;
+      if (!nullableRef) {
+        throw new Error('Decorated type deeper than introspection query.');
+      }
+      const nullableType = getType(nullableRef);
+      return new GraphQLNonNull(assertNullableType(nullableType));
+    }
+    return getNamedType(typeRef);
+  }
+
+  function getNamedType(
+    typeRef: IntrospectionNamedTypeRef<>,
+  ): GraphQLNamedType {
+    const typeName = typeRef.name;
+    if (!typeName) {
+      throw new Error(`Unknown type reference: ${inspect(typeRef)}.`);
+    }
+
+    const type = typeMap[typeName];
+    if (!type) {
+      throw new Error(
+        `Invalid or incomplete schema, unknown type: ${typeName}. Ensure that a full introspection query is used in order to build a client schema.`,
+      );
+    }
+
+    return type;
+  }
+
+  function getObjectType(
+    typeRef: IntrospectionNamedTypeRef<IntrospectionObjectType>,
+  ): GraphQLObjectType {
+    return assertObjectType(getNamedType(typeRef));
+  }
+
+  function getInterfaceType(
+    typeRef: IntrospectionNamedTypeRef<IntrospectionInterfaceType>,
+  ): GraphQLInterfaceType {
+    return assertInterfaceType(getNamedType(typeRef));
+  }
+
+  // Given a type's introspection result, construct the correct
+  // GraphQLType instance.
+  function buildType(type: IntrospectionType): GraphQLNamedType {
+    if (type != null && type.name != null && type.kind != null) {
+      switch (type.kind) {
+        case TypeKind.SCALAR:
+          return buildScalarDef(type);
+        case TypeKind.OBJECT:
+          return buildObjectDef(type);
+        case TypeKind.INTERFACE:
+          return buildInterfaceDef(type);
+        case TypeKind.UNION:
+          return buildUnionDef(type);
+        case TypeKind.ENUM:
+          return buildEnumDef(type);
+        case TypeKind.INPUT_OBJECT:
+          return buildInputObjectDef(type);
+      }
+    }
+    const typeStr = inspect(type);
+    throw new Error(
+      `Invalid or incomplete introspection result. Ensure that a full introspection query is used in order to build a client schema: ${typeStr}.`,
+    );
+  }
+
+  function buildScalarDef(
+    scalarIntrospection: IntrospectionScalarType,
+  ): GraphQLScalarType {
+    return new GraphQLScalarType({
+      name: scalarIntrospection.name,
+      description: scalarIntrospection.description,
+      specifiedByUrl: scalarIntrospection.specifiedByUrl,
+    });
+  }
+
+  function buildImplementationsList(
+    implementingIntrospection:
+      | IntrospectionObjectType
+      | IntrospectionInterfaceType,
+  ): Array<GraphQLInterfaceType> {
+    // TODO: Temporary workaround until GraphQL ecosystem will fully support
+    // 'interfaces' on interface types.
+    if (
+      implementingIntrospection.interfaces === null &&
+      implementingIntrospection.kind === TypeKind.INTERFACE
+    ) {
+      return [];
+    }
+
+    if (!implementingIntrospection.interfaces) {
+      const implementingIntrospectionStr = inspect(implementingIntrospection);
+      throw new Error(
+        `Introspection result missing interfaces: ${implementingIntrospectionStr}.`,
+      );
+    }
+
+    return implementingIntrospection.interfaces.map(getInterfaceType);
+  }
+
+  function buildObjectDef(
+    objectIntrospection: IntrospectionObjectType,
+  ): GraphQLObjectType {
+    return new GraphQLObjectType({
+      name: objectIntrospection.name,
+      description: objectIntrospection.description,
+      interfaces: () => buildImplementationsList(objectIntrospection),
+      fields: () => buildFieldDefMap(objectIntrospection),
+    });
+  }
+
+  function buildInterfaceDef(
+    interfaceIntrospection: IntrospectionInterfaceType,
+  ): GraphQLInterfaceType {
+    return new GraphQLInterfaceType({
+      name: interfaceIntrospection.name,
+      description: interfaceIntrospection.description,
+      interfaces: () => buildImplementationsList(interfaceIntrospection),
+      fields: () => buildFieldDefMap(interfaceIntrospection),
+    });
+  }
+
+  function buildUnionDef(
+    unionIntrospection: IntrospectionUnionType,
+  ): GraphQLUnionType {
+    if (!unionIntrospection.possibleTypes) {
+      const unionIntrospectionStr = inspect(unionIntrospection);
+      throw new Error(
+        `Introspection result missing possibleTypes: ${unionIntrospectionStr}.`,
+      );
+    }
+    return new GraphQLUnionType({
+      name: unionIntrospection.name,
+      description: unionIntrospection.description,
+      types: () => unionIntrospection.possibleTypes.map(getObjectType),
+    });
+  }
+
+  function buildEnumDef(
+    enumIntrospection: IntrospectionEnumType,
+  ): GraphQLEnumType {
+    if (!enumIntrospection.enumValues) {
+      const enumIntrospectionStr = inspect(enumIntrospection);
+      throw new Error(
+        `Introspection result missing enumValues: ${enumIntrospectionStr}.`,
+      );
+    }
+    return new GraphQLEnumType({
+      name: enumIntrospection.name,
+      description: enumIntrospection.description,
+      values: keyValMap(
+        enumIntrospection.enumValues,
+        (valueIntrospection) => valueIntrospection.name,
+        (valueIntrospection) => ({
+          description: valueIntrospection.description,
+          deprecationReason: valueIntrospection.deprecationReason,
+        }),
+      ),
+    });
+  }
+
+  function buildInputObjectDef(
+    inputObjectIntrospection: IntrospectionInputObjectType,
+  ): GraphQLInputObjectType {
+    if (!inputObjectIntrospection.inputFields) {
+      const inputObjectIntrospectionStr = inspect(inputObjectIntrospection);
+      throw new Error(
+        `Introspection result missing inputFields: ${inputObjectIntrospectionStr}.`,
+      );
+    }
+    return new GraphQLInputObjectType({
+      name: inputObjectIntrospection.name,
+      description: inputObjectIntrospection.description,
+      fields: () => buildInputValueDefMap(inputObjectIntrospection.inputFields),
+    });
+  }
+
+  function buildFieldDefMap(
+    typeIntrospection: IntrospectionObjectType | IntrospectionInterfaceType,
+  ): GraphQLFieldConfigMap<mixed, mixed> {
+    if (!typeIntrospection.fields) {
+      throw new Error(
+        `Introspection result missing fields: ${inspect(typeIntrospection)}.`,
+      );
+    }
+
+    return keyValMap(
+      typeIntrospection.fields,
+      (fieldIntrospection) => fieldIntrospection.name,
+      buildField,
+    );
+  }
+
+  function buildField(
+    fieldIntrospection: IntrospectionField,
+  ): GraphQLFieldConfig<mixed, mixed> {
+    const type = getType(fieldIntrospection.type);
+    if (!isOutputType(type)) {
+      const typeStr = inspect(type);
+      throw new Error(
+        `Introspection must provide output type for fields, but received: ${typeStr}.`,
+      );
+    }
+
+    if (!fieldIntrospection.args) {
+      const fieldIntrospectionStr = inspect(fieldIntrospection);
+      throw new Error(
+        `Introspection result missing field args: ${fieldIntrospectionStr}.`,
+      );
+    }
+
+    return {
+      description: fieldIntrospection.description,
+      deprecationReason: fieldIntrospection.deprecationReason,
+      type,
+      args: buildInputValueDefMap(fieldIntrospection.args),
+    };
+  }
+
+  function buildInputValueDefMap(
+    inputValueIntrospections: $ReadOnlyArray<IntrospectionInputValue>,
+  ) {
+    return keyValMap(
+      inputValueIntrospections,
+      (inputValue) => inputValue.name,
+      buildInputValue,
+    );
+  }
+
+  function buildInputValue(inputValueIntrospection: IntrospectionInputValue) {
+    const type = getType(inputValueIntrospection.type);
+    if (!isInputType(type)) {
+      const typeStr = inspect(type);
+      throw new Error(
+        `Introspection must provide input type for arguments, but received: ${typeStr}.`,
+      );
+    }
+
+    const defaultValue =
+      inputValueIntrospection.defaultValue != null
+        ? valueFromAST(parseValue(inputValueIntrospection.defaultValue), type)
+        : undefined;
+    return {
+      description: inputValueIntrospection.description,
+      type,
+      defaultValue,
+      deprecationReason: inputValueIntrospection.deprecationReason,
+    };
+  }
+
+  function buildDirective(
+    directiveIntrospection: IntrospectionDirective,
+  ): GraphQLDirective {
+    if (!directiveIntrospection.args) {
+      const directiveIntrospectionStr = inspect(directiveIntrospection);
+      throw new Error(
+        `Introspection result missing directive args: ${directiveIntrospectionStr}.`,
+      );
+    }
+    if (!directiveIntrospection.locations) {
+      const directiveIntrospectionStr = inspect(directiveIntrospection);
+      throw new Error(
+        `Introspection result missing directive locations: ${directiveIntrospectionStr}.`,
+      );
+    }
+    return new GraphQLDirective({
+      name: directiveIntrospection.name,
+      description: directiveIntrospection.description,
+      isRepeatable: directiveIntrospection.isRepeatable,
+      locations: directiveIntrospection.locations.slice(),
+      args: buildInputValueDefMap(directiveIntrospection.args),
+    });
+  }
+}