@graphql-tools/schema/index.esm.js

import { defaultFieldResolver, isScalarType, getNamedType, Kind, print, buildASTSchema, extendSchema, isSchema, isSpecifiedScalarType, isEnumType, isUnionType, isObjectType, isInterfaceType, GraphQLEnumType, GraphQLScalarType, GraphQLUnionType, GraphQLObjectType, GraphQLInterfaceType } from 'graphql';
import { mapSchema, MapperKind, forEachField, getDirectives, parseGraphQLSDL, isDocumentNode, forEachDefaultValue, serializeInputValue, healSchema, parseInputValue, mergeDeep, SchemaDirectiveVisitor, pruneSchema } from '@graphql-tools/utils';

// wraps all resolvers of query, mutation or subscription fields
// with the provided function to simulate a root schema level resolver
function addSchemaLevelResolver(schema, fn) {
    // TODO test that schema is a schema, fn is a function
    const fnToRunOnlyOnce = runAtMostOncePerRequest(fn);
    return mapSchema(schema, {
        [MapperKind.ROOT_FIELD]: (fieldConfig, _fieldName, typeName, schema) => {
            // XXX this should run at most once per request to simulate a true root resolver
            // for graphql-js this is an approximation that works with queries but not mutations
            // XXX if the type is a subscription, a same query AST will be ran multiple times so we
            // deactivate here the runOnce if it's a subscription. This may not be optimal though...
            const subscription = schema.getSubscriptionType();
            if (subscription != null && subscription.name === typeName) {
                return {
                    ...fieldConfig,
                    resolve: wrapResolver(fieldConfig.resolve, fn),
                };
            }
            return {
                ...fieldConfig,
                resolve: wrapResolver(fieldConfig.resolve, fnToRunOnlyOnce),
            };
        },
    });
}
// XXX badly named function. this doesn't really wrap, it just chains resolvers...
function wrapResolver(innerResolver, outerResolver) {
    return (obj, args, ctx, info) => resolveMaybePromise(outerResolver(obj, args, ctx, info), root => {
        if (innerResolver != null) {
            return innerResolver(root, args, ctx, info);
        }
        return defaultFieldResolver(root, args, ctx, info);
    });
}
function isPromise(maybePromise) {
    return maybePromise && typeof maybePromise.then === 'function';
}
// resolvers can be synchronous or asynchronous. if all resolvers
// in an operation return synchronously, the execution should return
// synchronously. the maybe-sync/maybe-async nature of resolvers should be
// preserved
function resolveMaybePromise(maybePromise, fulfillmentCallback) {
    if (isPromise(maybePromise)) {
        return maybePromise.then(fulfillmentCallback);
    }
    return fulfillmentCallback(maybePromise);
}
// XXX this function only works for resolvers
// XXX very hacky way to remember if the function
// already ran for this request. This will only work
// if people don't actually cache the operation.
// if they do cache the operation, they will have to
// manually remove the __runAtMostOnce before every request.
function runAtMostOncePerRequest(fn) {
    let value;
    const randomNumber = Math.random();
    return (root, args, ctx, info) => {
        if (!info.operation['__runAtMostOnce']) {
            info.operation['__runAtMostOnce'] = {};
        }
        if (!info.operation['__runAtMostOnce'][randomNumber]) {
            info.operation['__runAtMostOnce'][randomNumber] = true;
            value = fn(root, args, ctx, info);
        }
        return value;
    };
}

function assertResolversPresent(schema, resolverValidationOptions = {}) {
    const { requireResolversForArgs, requireResolversForNonScalar, requireResolversForAllFields, } = resolverValidationOptions;
    if (requireResolversForAllFields && (requireResolversForArgs || requireResolversForNonScalar)) {
        throw new TypeError('requireResolversForAllFields takes precedence over the more specific assertions. ' +
            'Please configure either requireResolversForAllFields or requireResolversForArgs / ' +
            'requireResolversForNonScalar, but not a combination of them.');
    }
    forEachField(schema, (field, typeName, fieldName) => {
        // requires a resolver for *every* field.
        if (requireResolversForAllFields) {
            expectResolver('requireResolversForAllFields', requireResolversForAllFields, field, typeName, fieldName);
        }
        // requires a resolver on every field that has arguments
        if (requireResolversForArgs && field.args.length > 0) {
            expectResolver('requireResolversForArgs', requireResolversForArgs, field, typeName, fieldName);
        }
        // requires a resolver on every field that returns a non-scalar type
        if (requireResolversForNonScalar !== 'ignore' && !isScalarType(getNamedType(field.type))) {
            expectResolver('requireResolversForNonScalar', requireResolversForNonScalar, field, typeName, fieldName);
        }
    });
}
function expectResolver(validator, behavior, field, typeName, fieldName) {
    if (!field.resolve) {
        const message = `Resolver missing for "${typeName}.${fieldName}".
To disable this validator, use:
  resolverValidationOptions: {
    ${validator}: 'ignore'
  }`;
        if (behavior === 'error') {
            throw new Error(message);
        }
        if (behavior === 'warn') {
            // eslint-disable-next-line no-console
            console.warn(message);
        }
        return;
    }
    if (typeof field.resolve !== 'function') {
        throw new Error(`Resolver "${typeName}.${fieldName}" must be a function`);
    }
}

function attachDirectiveResolvers(schema, directiveResolvers) {
    if (typeof directiveResolvers !== 'object') {
        throw new Error(`Expected directiveResolvers to be of type object, got ${typeof directiveResolvers}`);
    }
    if (Array.isArray(directiveResolvers)) {
        throw new Error('Expected directiveResolvers to be of type object, got Array');
    }
    return mapSchema(schema, {
        [MapperKind.OBJECT_FIELD]: fieldConfig => {
            const newFieldConfig = { ...fieldConfig };
            const directives = getDirectives(schema, fieldConfig);
            Object.keys(directives).forEach(directiveName => {
                if (directiveResolvers[directiveName]) {
                    const resolver = directiveResolvers[directiveName];
                    const originalResolver = newFieldConfig.resolve != null ? newFieldConfig.resolve : defaultFieldResolver;
                    const directiveArgs = directives[directiveName];
                    newFieldConfig.resolve = (source, originalArgs, context, info) => {
                        return resolver(() => new Promise((resolve, reject) => {
                            const result = originalResolver(source, originalArgs, context, info);
                            if (result instanceof Error) {
                                reject(result);
                            }
                            resolve(result);
                        }), source, directiveArgs, context, info);
                    };
                }
            });
            return newFieldConfig;
        },
    });
}

const isExtensionNode = (def) => def.kind === Kind.OBJECT_TYPE_EXTENSION ||
    def.kind === Kind.INTERFACE_TYPE_EXTENSION ||
    def.kind === Kind.INPUT_OBJECT_TYPE_EXTENSION ||
    def.kind === Kind.UNION_TYPE_EXTENSION ||
    def.kind === Kind.ENUM_TYPE_EXTENSION ||
    def.kind === Kind.SCALAR_TYPE_EXTENSION ||
    def.kind === Kind.SCHEMA_EXTENSION;
function filterAndExtractExtensionDefinitions(ast) {
    const extensionDefs = [];
    const typesDefs = [];
    ast.definitions.forEach(def => {
        if (isExtensionNode(def)) {
            extensionDefs.push(def);
        }
        else {
            typesDefs.push(def);
        }
    });
    return {
        typesAst: {
            ...ast,
            definitions: typesDefs,
        },
        extensionsAst: {
            ...ast,
            definitions: extensionDefs,
        },
    };
}
function filterExtensionDefinitions(ast) {
    const { typesAst } = filterAndExtractExtensionDefinitions(ast);
    return typesAst;
}
function extractExtensionDefinitions(ast) {
    const { extensionsAst } = filterAndExtractExtensionDefinitions(ast);
    return extensionsAst;
}

function concatenateTypeDefs(typeDefinitionsAry, calledFunctionRefs = new Set()) {
    const resolvedTypeDefinitions = new Set();
    typeDefinitionsAry.forEach((typeDef) => {
        if (typeof typeDef === 'function') {
            if (!calledFunctionRefs.has(typeDef)) {
                calledFunctionRefs.add(typeDef);
                resolvedTypeDefinitions.add(concatenateTypeDefs(typeDef(), calledFunctionRefs));
            }
        }
        else if (typeof typeDef === 'string') {
            resolvedTypeDefinitions.add(typeDef.trim());
        }
        else if (typeDef.kind !== undefined) {
            resolvedTypeDefinitions.add(print(typeDef).trim());
        }
        else {
            const type = typeof typeDef;
            throw new Error(`typeDef array must contain only strings, documents, or functions, got ${type}`);
        }
    });
    return [...resolvedTypeDefinitions].join('\n');
}

function buildSchemaFromTypeDefinitions(typeDefinitions, parseOptions, noExtensionExtraction) {
    const document = buildDocumentFromTypeDefinitions(typeDefinitions, parseOptions);
    if (noExtensionExtraction) {
        return buildASTSchema(document);
    }
    const { typesAst, extensionsAst } = filterAndExtractExtensionDefinitions(document);
    const backcompatOptions = { commentDescriptions: true };
    let schema = buildASTSchema(typesAst, backcompatOptions);
    if (extensionsAst.definitions.length > 0) {
        schema = extendSchema(schema, extensionsAst, backcompatOptions);
    }
    return schema;
}
function buildDocumentFromTypeDefinitions(typeDefinitions, parseOptions) {
    let document;
    if (typeof typeDefinitions === 'string') {
        document = parseGraphQLSDL('', typeDefinitions, parseOptions).document;
    }
    else if (Array.isArray(typeDefinitions)) {
        document = parseGraphQLSDL('', concatenateTypeDefs(typeDefinitions), parseOptions).document;
    }
    else if (isDocumentNode(typeDefinitions)) {
        document = typeDefinitions;
    }
    else {
        const type = typeof typeDefinitions;
        throw new Error(`typeDefs must be a string, array or schema AST, got ${type}`);
    }
    return document;
}

function chainResolvers(resolvers) {
    return (root, args, ctx, info) => resolvers.reduce((prev, curResolver) => {
        if (curResolver != null) {
            return curResolver(prev, args, ctx, info);
        }
        return defaultFieldResolver(prev, args, ctx, info);
    }, root);
}

/*
 * fn: The function to decorate with the logger
 * logger: an object instance of type Logger
 * hint: an optional hint to add to the error's message
 */
function decorateWithLogger(fn, logger, hint) {
    const resolver = fn != null ? fn : defaultFieldResolver;
    const logError = (e) => {
        // TODO: clone the error properly
        const newE = new Error();
        newE.stack = e.stack;
        /* istanbul ignore else: always get the hint from addErrorLoggingToSchema */
        if (hint) {
            newE['originalMessage'] = e.message;
            newE.message = `Error in resolver ${hint}\n${e.message}`;
        }
        logger.log(newE);
    };
    return (root, args, ctx, info) => {
        try {
            const result = resolver(root, args, ctx, info);
            // If the resolver returns a Promise log any Promise rejects.
            if (result && typeof result.then === 'function' && typeof result.catch === 'function') {
                result.catch((reason) => {
                    // make sure that it's an error we're logging.
                    const error = reason instanceof Error ? reason : new Error(reason);
                    logError(error);
                    // We don't want to leave an unhandled exception so pass on error.
                    return reason;
                });
            }
            return result;
        }
        catch (e) {
            logError(e);
            // we want to pass on the error, just in case.
            throw e;
        }
    };
}

// If we have any union or interface types throw if no there is no resolveType resolver
function checkForResolveTypeResolver(schema, requireResolversForResolveType) {
    mapSchema(schema, {
        [MapperKind.ABSTRACT_TYPE]: type => {
            if (!type.resolveType) {
                const message = `Type "${type.name}" is missing a "__resolveType" resolver. Pass 'ignore' into ` +
                    '"resolverValidationOptions.requireResolversForResolveType" to disable this error.';
                if (requireResolversForResolveType === 'error') {
                    throw new Error(message);
                }
                if (requireResolversForResolveType === 'warn') {
                    // eslint-disable-next-line no-console
                    console.warn(message);
                }
            }
            return undefined;
        },
    });
}

function extendResolversFromInterfaces(schema, resolvers) {
    const typeNames = Object.keys({
        ...schema.getTypeMap(),
        ...resolvers,
    });
    const extendedResolvers = {};
    typeNames.forEach(typeName => {
        const type = schema.getType(typeName);
        if ('getInterfaces' in type) {
            const allInterfaceResolvers = type
                .getInterfaces()
                .map(iFace => resolvers[iFace.name])
                .filter(interfaceResolvers => interfaceResolvers != null);
            extendedResolvers[typeName] = {};
            allInterfaceResolvers.forEach(interfaceResolvers => {
                Object.keys(interfaceResolvers).forEach(fieldName => {
                    if (fieldName === '__isTypeOf' || !fieldName.startsWith('__')) {
                        extendedResolvers[typeName][fieldName] = interfaceResolvers[fieldName];
                    }
                });
            });
            const typeResolvers = resolvers[typeName];
            extendedResolvers[typeName] = {
                ...extendedResolvers[typeName],
                ...typeResolvers,
            };
        }
        else {
            const typeResolvers = resolvers[typeName];
            if (typeResolvers != null) {
                extendedResolvers[typeName] = typeResolvers;
            }
        }
    });
    return extendedResolvers;
}

function addResolversToSchema(schemaOrOptions, legacyInputResolvers, legacyInputValidationOptions) {
    const options = isSchema(schemaOrOptions)
        ? {
            schema: schemaOrOptions,
            resolvers: legacyInputResolvers,
            resolverValidationOptions: legacyInputValidationOptions,
        }
        : schemaOrOptions;
    let { schema, resolvers: inputResolvers, defaultFieldResolver, resolverValidationOptions = {}, inheritResolversFromInterfaces = false, updateResolversInPlace = false, } = options;
    const { requireResolversToMatchSchema = 'error', requireResolversForResolveType } = resolverValidationOptions;
    const resolvers = inheritResolversFromInterfaces
        ? extendResolversFromInterfaces(schema, inputResolvers)
        : inputResolvers;
    Object.keys(resolvers).forEach(typeName => {
        const resolverValue = resolvers[typeName];
        const resolverType = typeof resolverValue;
        if (typeName === '__schema') {
            if (resolverType !== 'function') {
                throw new Error(`"${typeName}" defined in resolvers, but has invalid value "${resolverValue}". A schema resolver's value must be of type object or function.`);
            }
        }
        else {
            if (resolverType !== 'object') {
                throw new Error(`"${typeName}" defined in resolvers, but has invalid value "${resolverValue}". The resolver's value must be of type object.`);
            }
            const type = schema.getType(typeName);
            if (type == null) {
                if (requireResolversToMatchSchema === 'ignore') {
                    return;
                }
                throw new Error(`"${typeName}" defined in resolvers, but not in schema`);
            }
            else if (isSpecifiedScalarType(type)) {
                // allow -- without recommending -- overriding of specified scalar types
                Object.keys(resolverValue).forEach(fieldName => {
                    if (fieldName.startsWith('__')) {
                        type[fieldName.substring(2)] = resolverValue[fieldName];
                    }
                    else {
                        type[fieldName] = resolverValue[fieldName];
                    }
                });
            }
            else if (isEnumType(type)) {
                const values = type.getValues();
                Object.keys(resolverValue).forEach(fieldName => {
                    if (!fieldName.startsWith('__') &&
                        !values.some(value => value.name === fieldName) &&
                        requireResolversToMatchSchema &&
                        requireResolversToMatchSchema !== 'ignore') {
                        throw new Error(`${type.name}.${fieldName} was defined in resolvers, but not present within ${type.name}`);
                    }
                });
            }
            else if (isUnionType(type)) {
                Object.keys(resolverValue).forEach(fieldName => {
                    if (!fieldName.startsWith('__') &&
                        requireResolversToMatchSchema &&
                        requireResolversToMatchSchema !== 'ignore') {
                        throw new Error(`${type.name}.${fieldName} was defined in resolvers, but ${type.name} is not an object or interface type`);
                    }
                });
            }
            else if (isObjectType(type) || isInterfaceType(type)) {
                Object.keys(resolverValue).forEach(fieldName => {
                    if (!fieldName.startsWith('__')) {
                        const fields = type.getFields();
                        const field = fields[fieldName];
                        if (field == null && requireResolversToMatchSchema && requireResolversToMatchSchema !== 'ignore') {
                            throw new Error(`${typeName}.${fieldName} defined in resolvers, but not in schema`);
                        }
                        const fieldResolve = resolverValue[fieldName];
                        if (typeof fieldResolve !== 'function' && typeof fieldResolve !== 'object') {
                            throw new Error(`Resolver ${typeName}.${fieldName} must be object or function`);
                        }
                    }
                });
            }
        }
    });
    schema = updateResolversInPlace
        ? addResolversToExistingSchema(schema, resolvers, defaultFieldResolver)
        : createNewSchemaWithResolvers(schema, resolvers, defaultFieldResolver);
    if (requireResolversForResolveType || requireResolversForResolveType !== 'ignore') {
        checkForResolveTypeResolver(schema, requireResolversForResolveType);
    }
    return schema;
}
function addResolversToExistingSchema(schema, resolvers, defaultFieldResolver) {
    const typeMap = schema.getTypeMap();
    Object.keys(resolvers).forEach(typeName => {
        if (typeName !== '__schema') {
            const type = schema.getType(typeName);
            const resolverValue = resolvers[typeName];
            if (isScalarType(type)) {
                Object.keys(resolverValue).forEach(fieldName => {
                    var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k;
                    if (fieldName.startsWith('__')) {
                        type[fieldName.substring(2)] = resolverValue[fieldName];
                    }
                    else if (fieldName === 'astNode' && type.astNode != null) {
                        type.astNode = {
                            ...type.astNode,
                            description: (_c = (_b = (_a = resolverValue) === null || _a === void 0 ? void 0 : _a.astNode) === null || _b === void 0 ? void 0 : _b.description) !== null && _c !== void 0 ? _c : type.astNode.description,
                            directives: ((_d = type.astNode.directives) !== null && _d !== void 0 ? _d : []).concat((_g = (_f = (_e = resolverValue) === null || _e === void 0 ? void 0 : _e.astNode) === null || _f === void 0 ? void 0 : _f.directives) !== null && _g !== void 0 ? _g : []),
                        };
                    }
                    else if (fieldName === 'extensionASTNodes' && type.extensionASTNodes != null) {
                        type.extensionASTNodes = ((_h = []) !== null && _h !== void 0 ? _h : type.extensionASTNodes).concat((_k = (_j = resolverValue) === null || _j === void 0 ? void 0 : _j.extensionASTNodes) !== null && _k !== void 0 ? _k : []);
                    }
                    else if (fieldName === 'extensions' &&
                        type.extensions != null &&
                        resolverValue.extensions != null) {
                        type.extensions = Object.assign({}, type.extensions, resolverValue.extensions);
                    }
                    else {
                        type[fieldName] = resolverValue[fieldName];
                    }
                });
            }
            else if (isEnumType(type)) {
                const config = type.toConfig();
                const enumValueConfigMap = config.values;
                Object.keys(resolverValue).forEach(fieldName => {
                    var _a, _b, _c, _d, _e, _f, _g, _h, _j;
                    if (fieldName.startsWith('__')) {
                        config[fieldName.substring(2)] = resolverValue[fieldName];
                    }
                    else if (fieldName === 'astNode' && config.astNode != null) {
                        config.astNode = {
                            ...config.astNode,
                            description: (_c = (_b = (_a = resolverValue) === null || _a === void 0 ? void 0 : _a.astNode) === null || _b === void 0 ? void 0 : _b.description) !== null && _c !== void 0 ? _c : config.astNode.description,
                            directives: ((_d = config.astNode.directives) !== null && _d !== void 0 ? _d : []).concat((_g = (_f = (_e = resolverValue) === null || _e === void 0 ? void 0 : _e.astNode) === null || _f === void 0 ? void 0 : _f.directives) !== null && _g !== void 0 ? _g : []),
                        };
                    }
                    else if (fieldName === 'extensionASTNodes' && config.extensionASTNodes != null) {
                        config.extensionASTNodes = config.extensionASTNodes.concat((_j = (_h = resolverValue) === null || _h === void 0 ? void 0 : _h.extensionASTNodes) !== null && _j !== void 0 ? _j : []);
                    }
                    else if (fieldName === 'extensions' &&
                        type.extensions != null &&
                        resolverValue.extensions != null) {
                        type.extensions = Object.assign({}, type.extensions, resolverValue.extensions);
                    }
                    else if (enumValueConfigMap[fieldName]) {
                        enumValueConfigMap[fieldName].value = resolverValue[fieldName];
                    }
                });
                typeMap[typeName] = new GraphQLEnumType(config);
            }
            else if (isUnionType(type)) {
                Object.keys(resolverValue).forEach(fieldName => {
                    if (fieldName.startsWith('__')) {
                        type[fieldName.substring(2)] = resolverValue[fieldName];
                    }
                });
            }
            else if (isObjectType(type) || isInterfaceType(type)) {
                Object.keys(resolverValue).forEach(fieldName => {
                    if (fieldName.startsWith('__')) {
                        // this is for isTypeOf and resolveType and all the other stuff.
                        type[fieldName.substring(2)] = resolverValue[fieldName];
                        return;
                    }
                    const fields = type.getFields();
                    const field = fields[fieldName];
                    if (field != null) {
                        const fieldResolve = resolverValue[fieldName];
                        if (typeof fieldResolve === 'function') {
                            // for convenience. Allows shorter syntax in resolver definition file
                            field.resolve = fieldResolve;
                        }
                        else {
                            setFieldProperties(field, fieldResolve);
                        }
                    }
                });
            }
        }
    });
    // serialize all default values prior to healing fields with new scalar/enum types.
    forEachDefaultValue(schema, serializeInputValue);
    // schema may have new scalar/enum types that require healing
    healSchema(schema);
    // reparse all default values with new parsing functions.
    forEachDefaultValue(schema, parseInputValue);
    if (defaultFieldResolver != null) {
        forEachField(schema, field => {
            if (!field.resolve) {
                field.resolve = defaultFieldResolver;
            }
        });
    }
    return schema;
}
function createNewSchemaWithResolvers(schema, resolvers, defaultFieldResolver) {
    schema = mapSchema(schema, {
        [MapperKind.SCALAR_TYPE]: type => {
            const config = type.toConfig();
            const resolverValue = resolvers[type.name];
            if (!isSpecifiedScalarType(type) && resolverValue != null) {
                Object.keys(resolverValue).forEach(fieldName => {
                    var _a, _b, _c, _d, _e, _f, _g, _h, _j;
                    if (fieldName.startsWith('__')) {
                        config[fieldName.substring(2)] = resolverValue[fieldName];
                    }
                    else if (fieldName === 'astNode' && config.astNode != null) {
                        config.astNode = {
                            ...config.astNode,
                            description: (_c = (_b = (_a = resolverValue) === null || _a === void 0 ? void 0 : _a.astNode) === null || _b === void 0 ? void 0 : _b.description) !== null && _c !== void 0 ? _c : config.astNode.description,
                            directives: ((_d = config.astNode.directives) !== null && _d !== void 0 ? _d : []).concat((_g = (_f = (_e = resolverValue) === null || _e === void 0 ? void 0 : _e.astNode) === null || _f === void 0 ? void 0 : _f.directives) !== null && _g !== void 0 ? _g : []),
                        };
                    }
                    else if (fieldName === 'extensionASTNodes' && config.extensionASTNodes != null) {
                        config.extensionASTNodes = config.extensionASTNodes.concat((_j = (_h = resolverValue) === null || _h === void 0 ? void 0 : _h.extensionASTNodes) !== null && _j !== void 0 ? _j : []);
                    }
                    else if (fieldName === 'extensions' &&
                        config.extensions != null &&
                        resolverValue.extensions != null) {
                        config.extensions = Object.assign({}, type.extensions, resolverValue.extensions);
                    }
                    else {
                        config[fieldName] = resolverValue[fieldName];
                    }
                });
                return new GraphQLScalarType(config);
            }
        },
        [MapperKind.ENUM_TYPE]: type => {
            const resolverValue = resolvers[type.name];
            const config = type.toConfig();
            const enumValueConfigMap = config.values;
            if (resolverValue != null) {
                Object.keys(resolverValue).forEach(fieldName => {
                    var _a, _b, _c, _d, _e, _f, _g, _h, _j;
                    if (fieldName.startsWith('__')) {
                        config[fieldName.substring(2)] = resolverValue[fieldName];
                    }
                    else if (fieldName === 'astNode' && config.astNode != null) {
                        config.astNode = {
                            ...config.astNode,
                            description: (_c = (_b = (_a = resolverValue) === null || _a === void 0 ? void 0 : _a.astNode) === null || _b === void 0 ? void 0 : _b.description) !== null && _c !== void 0 ? _c : config.astNode.description,
                            directives: ((_d = config.astNode.directives) !== null && _d !== void 0 ? _d : []).concat((_g = (_f = (_e = resolverValue) === null || _e === void 0 ? void 0 : _e.astNode) === null || _f === void 0 ? void 0 : _f.directives) !== null && _g !== void 0 ? _g : []),
                        };
                    }
                    else if (fieldName === 'extensionASTNodes' && config.extensionASTNodes != null) {
                        config.extensionASTNodes = config.extensionASTNodes.concat((_j = (_h = resolverValue) === null || _h === void 0 ? void 0 : _h.extensionASTNodes) !== null && _j !== void 0 ? _j : []);
                    }
                    else if (fieldName === 'extensions' &&
                        config.extensions != null &&
                        resolverValue.extensions != null) {
                        config.extensions = Object.assign({}, type.extensions, resolverValue.extensions);
                    }
                    else if (enumValueConfigMap[fieldName]) {
                        enumValueConfigMap[fieldName].value = resolverValue[fieldName];
                    }
                });
                return new GraphQLEnumType(config);
            }
        },
        [MapperKind.UNION_TYPE]: type => {
            const resolverValue = resolvers[type.name];
            if (resolverValue != null) {
                const config = type.toConfig();
                Object.keys(resolverValue).forEach(fieldName => {
                    if (fieldName.startsWith('__')) {
                        config[fieldName.substring(2)] = resolverValue[fieldName];
                    }
                });
                return new GraphQLUnionType(config);
            }
        },
        [MapperKind.OBJECT_TYPE]: type => {
            const resolverValue = resolvers[type.name];
            if (resolverValue != null) {
                const config = type.toConfig();
                Object.keys(resolverValue).forEach(fieldName => {
                    if (fieldName.startsWith('__')) {
                        config[fieldName.substring(2)] = resolverValue[fieldName];
                    }
                });
                return new GraphQLObjectType(config);
            }
        },
        [MapperKind.INTERFACE_TYPE]: type => {
            const resolverValue = resolvers[type.name];
            if (resolverValue != null) {
                const config = type.toConfig();
                Object.keys(resolverValue).forEach(fieldName => {
                    if (fieldName.startsWith('__')) {
                        config[fieldName.substring(2)] = resolverValue[fieldName];
                    }
                });
                return new GraphQLInterfaceType(config);
            }
        },
        [MapperKind.COMPOSITE_FIELD]: (fieldConfig, fieldName, typeName) => {
            const resolverValue = resolvers[typeName];
            if (resolverValue != null) {
                const fieldResolve = resolverValue[fieldName];
                if (fieldResolve != null) {
                    const newFieldConfig = { ...fieldConfig };
                    if (typeof fieldResolve === 'function') {
                        // for convenience. Allows shorter syntax in resolver definition file
                        newFieldConfig.resolve = fieldResolve;
                    }
                    else {
                        setFieldProperties(newFieldConfig, fieldResolve);
                    }
                    return newFieldConfig;
                }
            }
        },
    });
    if (defaultFieldResolver != null) {
        schema = mapSchema(schema, {
            [MapperKind.OBJECT_FIELD]: fieldConfig => ({
                ...fieldConfig,
                resolve: fieldConfig.resolve != null ? fieldConfig.resolve : defaultFieldResolver,
            }),
        });
    }
    return schema;
}
function setFieldProperties(field, propertiesObj) {
    Object.keys(propertiesObj).forEach(propertyName => {
        field[propertyName] = propertiesObj[propertyName];
    });
}

function addErrorLoggingToSchema(schema, logger) {
    if (!logger) {
        throw new Error('Must provide a logger');
    }
    if (typeof logger.log !== 'function') {
        throw new Error('Logger.log must be a function');
    }
    return mapSchema(schema, {
        [MapperKind.OBJECT_FIELD]: (fieldConfig, fieldName, typeName) => ({
            ...fieldConfig,
            resolve: decorateWithLogger(fieldConfig.resolve, logger, `${typeName}.${fieldName}`),
        }),
    });
}

function decorateToCatchUndefined(fn, hint) {
    const resolve = fn == null ? defaultFieldResolver : fn;
    return (root, args, ctx, info) => {
        const result = resolve(root, args, ctx, info);
        if (typeof result === 'undefined') {
            throw new Error(`Resolver for "${hint}" returned undefined`);
        }
        return result;
    };
}
function addCatchUndefinedToSchema(schema) {
    return mapSchema(schema, {
        [MapperKind.OBJECT_FIELD]: (fieldConfig, fieldName, typeName) => ({
            ...fieldConfig,
            resolve: decorateToCatchUndefined(fieldConfig.resolve, `${typeName}.${fieldName}`),
        }),
    });
}

/**
 * Builds a schema from the provided type definitions and resolvers.
 *
 * The type definitions are written using Schema Definition Language (SDL). They
 * can be provided as a string, a `DocumentNode`, a function, or an array of any
 * of these. If a function is provided, it will be passed no arguments and
 * should return an array of strings or `DocumentNode`s.
 *
 * Note: You can use `graphql-tag` to not only parse a string into a
 * `DocumentNode` but also to provide additional syntax highlighting in your
 * editor (with the appropriate editor plugin).
 *
 * ```js
 * const typeDefs = gql`
 *   type Query {
 *     posts: [Post]
 *     author(id: Int!): Author
 *   }
 * `;
 * ```
 *
 * The `resolvers` object should be a map of type names to nested object, which
 * themselves map the type's fields to their appropriate resolvers.
 * See the [Resolvers](/docs/resolvers) section of the documentation for more details.
 *
 * ```js
 * const resolvers = {
 *   Query: {
 *     posts: (obj, args, ctx, info) => getAllPosts(),
 *     author: (obj, args, ctx, info) => getAuthorById(args.id)
 *   }
 * };
 * ```
 *
 * Once you've defined both the `typeDefs` and `resolvers`, you can create your
 * schema:
 *
 * ```js
 * const schema = makeExecutableSchema({
 *   typeDefs,
 *   resolvers,
 * })
 * ```
 */
function makeExecutableSchema({ typeDefs, resolvers = {}, logger, allowUndefinedInResolve = true, resolverValidationOptions = {}, directiveResolvers, schemaDirectives, schemaTransforms: userProvidedSchemaTransforms, parseOptions = {}, inheritResolversFromInterfaces = false, pruningOptions, updateResolversInPlace = false, noExtensionExtraction = false, }) {
    // Validate and clean up arguments
    if (typeof resolverValidationOptions !== 'object') {
        throw new Error('Expected `resolverValidationOptions` to be an object');
    }
    if (!typeDefs) {
        throw new Error('Must provide typeDefs');
    }
    // Arguments are now validated and cleaned up
    const schemaTransforms = [
        schema => {
            // We allow passing in an array of resolver maps, in which case we merge them
            const resolverMap = Array.isArray(resolvers) ? resolvers.reduce(mergeDeep, {}) : resolvers;
            const schemaWithResolvers = addResolversToSchema({
                schema,
                resolvers: resolverMap,
                resolverValidationOptions,
                inheritResolversFromInterfaces,
                updateResolversInPlace,
            });
            if (Object.keys(resolverValidationOptions).length > 0) {
                assertResolversPresent(schemaWithResolvers, resolverValidationOptions);
            }
            return schemaWithResolvers;
        },
    ];
    if (!allowUndefinedInResolve) {
        schemaTransforms.push(addCatchUndefinedToSchema);
    }
    if (logger != null) {
        schemaTransforms.push(schema => addErrorLoggingToSchema(schema, logger));
    }
    if (typeof resolvers['__schema'] === 'function') {
        // TODO a bit of a hack now, better rewrite generateSchema to attach it there.
        // not doing that now, because I'd have to rewrite a lot of tests.
        schemaTransforms.push(schema => addSchemaLevelResolver(schema, resolvers['__schema']));
    }
    if (userProvidedSchemaTransforms) {
        schemaTransforms.push(schema => userProvidedSchemaTransforms.reduce((s, schemaTransform) => schemaTransform(s), schema));
    }
    // directive resolvers are implemented using SchemaDirectiveVisitor.visitSchemaDirectives
    // schema visiting modifies the schema in place
    if (directiveResolvers != null) {
        schemaTransforms.push(schema => attachDirectiveResolvers(schema, directiveResolvers));
    }
    if (schemaDirectives != null) {
        schemaTransforms.push(schema => {
            SchemaDirectiveVisitor.visitSchemaDirectives(schema, schemaDirectives);
            return schema;
        });
    }
    if (pruningOptions) {
        schemaTransforms.push(pruneSchema);
    }
    const schemaFromTypeDefs = buildSchemaFromTypeDefinitions(typeDefs, parseOptions, noExtensionExtraction);
    return schemaTransforms.reduce((schema, schemaTransform) => schemaTransform(schema), schemaFromTypeDefs);
}

export { addCatchUndefinedToSchema, addErrorLoggingToSchema, addResolversToSchema, addSchemaLevelResolver, assertResolversPresent, attachDirectiveResolvers, buildDocumentFromTypeDefinitions, buildSchemaFromTypeDefinitions, chainResolvers, checkForResolveTypeResolver, concatenateTypeDefs, decorateWithLogger, extendResolversFromInterfaces, extractExtensionDefinitions, filterAndExtractExtensionDefinitions, filterExtensionDefinitions, makeExecutableSchema };
//# sourceMappingURL=index.esm.js.map