I recently started following a YouTube tutorial on fullstack development with React, GraphQL, TypeScript, and the Apollo Server. While working on the Apollo server part and trying to pass the buildSchema function from type-graphql in the schema option, I encountered an error message.
Here's my TypeScript code:
import { MikroORM } from "@mikro-orm/core";
import { __port__, __prod__ } from "./constants";
import { Post } from "./entity/Post";
import express from "express";
import { ApolloServer } from "apollo-server-express";
import { buildSchema, Query, Resolver } from "type-graphql";
@Resolver()
class HelloResolver {
@Query(() => String)
hello() {
return "hi";
}
}
const main = async () => {
const orm = await MikroORM.init();
await orm
.getMigrator()
.up()
.catch((err) => {});
const app = express();
const apolloServer = new ApolloServer({ // line 24
schema: await buildSchema({
resolvers: [HelloResolver],
}),
});
apolloServer.applyMiddleware({ app });
app.listen(__port__, () => {
console.log(`server started on localhost:${__port__}/graphql`);
});
};
main().catch((err) => {
console.log(err);
});
Now, here is the error message I received:
PATH/node_modules/ts-node/src/index.ts:307
throw new TSError(formatDiagnostics(diagnosticList, cwd, ts, lineOffset))
^
TSError: ⨯ Unable to compile TypeScript
src/index.ts (24,41): Argument of type '{ schema: GraphQLSchema; }' is not assignable to parameter of type 'Config<ExpressContext>'.
Type '{ schema: GraphQLSchema; }' is missing the following properties from type 'Config<ExpressContext>': formatError, debug, rootValue, validationRules, and 6 more. (2345)
at getOutput (PATH/node_modules/ts-node/src/index.ts:307:15)
at PATH/node_modules/ts-node/src/index.ts:336:16
at Object.compile (PATH/node_modules/ts-node/src/index.ts:498:11)
at Module.m._compile (PATH/node_modules/ts-node/src/index.ts:392:43)
at Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
at Object.require.extensions.<computed> [as .ts] (PATH/node_modules/ts-node/src/index.ts:395:12)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:79:12)
at Object.<anonymous> (PATH/node_modules/ts-node/src/_bin.ts:182:12)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.