Modularized Resolvers and TypeDefs - Error: typeDefs.reduce is not a function

I am trying to place resolvers and typeDefs in separate files using merge-graphql-schemas. They are successfully merged however, I am getting this error when they reach new GraphQLServer({...}). Any help would be appreciated.

Error

TypeError: typeDefs.reduce is not a function
    at mergeTypeDefs (/[path...]/typeorm-demo/node_modules/graphql-yoga/src/index.ts:313:19)

Files

I have 2 .ts resolvers and 2 .graphql typeDefs formatted like:

#/resolvers/simple.resolver.ts

export default {
  Query: {
    beerMe: (_, { name }) => `Beer ${name || "Served"}`
  }
};

#/typeDefs/simple.typeDef.graphql

type Query {
  beerMe(name: String): String!
}

_#/typeDefs/index.ts

import * as path from "path";
import { fileLoader, mergeTypes } from "merge-graphql-schemas";

const typesArray = fileLoader(path.join(__dirname, "./"));
const typesMerged = mergeTypes(typesArray, { all: false });
console.log("typesMerged", typesMerged);
export default typesMerged;

#/resolvers/index.ts

import { mergeResolvers } from "merge-graphql-schemas";
import userResolver from "./user.resolvers";
import simpleResolver from "./simple.resolvers";

const resolversArray = [userResolver, simpleResolver];
const resolvers = mergeResolvers(resolversArray);
console.log("merged resolvers", resolvers);
export default resolvers;

#scr/index.ts

import "reflect-metadata";
import { createConnection } from "typeorm";
import { IResolvers } from "graphql-yoga/dist/src/types";
import { GraphQLServer } from "graphql-yoga";

const resolvers = require("./resolvers");
const typeDefs = require("./typeDefs");
const server = new GraphQLServer({ typeDefs, resolvers });
createConnection().then(() => {
  server.start(() => console.log("Server is running on localhost:4000"));
});

Directory structure

__src
|____entity
| |____Profile.ts
| |____User.mysql-version.ts.bak
| |____User.ts
|____index.ts
|____resolvers
| |____index.ts
| |____simple.resolvers.ts
| |____user.resolvers.ts
|____typeDefs
| |____index.ts
| |____simple.typedefs.graphql
| |____user.typedefs.graphql

[jboothe]

I’m on it. If it helps others remove that barrier, I’m glad to help.

[huv1k]

@marktani Wanted to add more insight. Your provided Object to mergeTypeDefs what is not supported. Currently is supported string, array, documentNode. So maybe there should be some better error handling to show proper error. So there is missing check for array and if it’s not an array just throw error 😃 I can add it to my PR #220 and add it to documentation with this fix extra.