@kamilkisiela/graphql-tools/dist/generate/addResolveFunctionsToSchema.js

Useful tools to create and manipulate GraphQL schemas.

Object.defineProperty(exports, "__esModule", { value: true });
var _1 = require(".");
var graphql_1 = require("graphql");
var transforms_1 = require("../transforms/transforms");
var _2 = require(".");
var ConvertEnumValues_1 = require("../transforms/ConvertEnumValues");
function addResolveFunctionsToSchema(options, legacyInputResolvers, legacyInputValidationOptions) {
    if (options instanceof graphql_1.GraphQLSchema) {
        console.warn('The addResolveFunctionsToSchema function takes named options now; see IAddResolveFunctionsToSchemaOptions');
        options = {
            schema: options,
            resolvers: legacyInputResolvers,
            resolverValidationOptions: legacyInputValidationOptions,
        };
    }
    var schema = options.schema, inputResolvers = options.resolvers, _a = options.resolverValidationOptions, resolverValidationOptions = _a === void 0 ? {} : _a, _b = options.inheritResolversFromInterfaces, inheritResolversFromInterfaces = _b === void 0 ? false : _b;
    var _c = resolverValidationOptions.allowResolversNotInSchema, allowResolversNotInSchema = _c === void 0 ? false : _c, requireResolversForResolveType = resolverValidationOptions.requireResolversForResolveType;
    var resolvers = inheritResolversFromInterfaces
        ? _2.extendResolversFromInterfaces(schema, inputResolvers)
        : inputResolvers;
    // Used to map the external value of an enum to its internal value, when
    // that internal value is provided by a resolver.
    var enumValueMap = Object.create(null);
    Object.keys(resolvers).forEach(function (typeName) {
        var resolverValue = resolvers[typeName];
        var resolverType = typeof resolverValue;
        if (resolverType !== 'object' && resolverType !== 'function') {
            throw new _1.SchemaError("\"" + typeName + "\" defined in resolvers, but has invalid value \"" + resolverValue + "\". A resolver's value " +
                "must be of type object or function.");
        }
        var type = schema.getType(typeName);
        if (!type && typeName !== '__schema') {
            if (allowResolversNotInSchema) {
                return;
            }
            throw new _1.SchemaError("\"" + typeName + "\" defined in resolvers, but not in schema");
        }
        Object.keys(resolverValue).forEach(function (fieldName) {
            if (fieldName.startsWith('__')) {
                // this is for isTypeOf and resolveType and all the other stuff.
                type[fieldName.substring(2)] = resolverValue[fieldName];
                return;
            }
            if (type instanceof graphql_1.GraphQLScalarType) {
                type[fieldName] = resolverValue[fieldName];
                return;
            }
            if (type instanceof graphql_1.GraphQLEnumType) {
                if (!type.getValue(fieldName)) {
                    if (allowResolversNotInSchema) {
                        return;
                    }
                    throw new _1.SchemaError(typeName + "." + fieldName + " was defined in resolvers, but enum is not in schema");
                }
                // We've encountered an enum resolver that is being used to provide an
                // internal enum value.
                // Reference: https://www.apollographql.com/docs/graphql-tools/scalars.html#internal-values
                //
                // We're storing a map of the current enums external facing value to
                // its resolver provided internal value. This map is used to transform
                // the current schema to a new schema that includes enums with the new
                // internal value.
                enumValueMap[type.name] = enumValueMap[type.name] || {};
                enumValueMap[type.name][fieldName] = resolverValue[fieldName];
                return;
            }
            // object type
            var fields = getFieldsForType(type);
            if (!fields) {
                if (allowResolversNotInSchema) {
                    return;
                }
                throw new _1.SchemaError(typeName + " was defined in resolvers, but it's not an object");
            }
            if (!fields[fieldName]) {
                if (allowResolversNotInSchema) {
                    return;
                }
                throw new _1.SchemaError(typeName + "." + fieldName + " defined in resolvers, but not in schema");
            }
            var field = fields[fieldName];
            var fieldResolve = resolverValue[fieldName];
            if (typeof fieldResolve === 'function') {
                // for convenience. Allows shorter syntax in resolver definition file
                setFieldProperties(field, { resolve: fieldResolve });
            }
            else {
                if (typeof fieldResolve !== 'object') {
                    throw new _1.SchemaError("Resolver " + typeName + "." + fieldName + " must be object or function");
                }
                setFieldProperties(field, fieldResolve);
            }
        });
    });
    _2.checkForResolveTypeResolver(schema, requireResolversForResolveType);
    // If there are any enum resolver functions (that are used to return
    // internal enum values), create a new schema that includes enums with the
    // new internal facing values.
    var updatedSchema = transforms_1.applySchemaTransforms(schema, [
        new ConvertEnumValues_1.default(enumValueMap),
    ]);
    return updatedSchema;
}
function getFieldsForType(type) {
    if (type instanceof graphql_1.GraphQLObjectType ||
        type instanceof graphql_1.GraphQLInterfaceType) {
        return type.getFields();
    }
    else {
        return undefined;
    }
}
function setFieldProperties(field, propertiesObj) {
    Object.keys(propertiesObj).forEach(function (propertyName) {
        field[propertyName] = propertiesObj[propertyName];
    });
}
exports.default = addResolveFunctionsToSchema;
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