Why do I get this error TypeError: Cannot read property 'utf8Slice' of undefined [closed] - node.js

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I have no prior knowledge about backend related codes and all so I decided to start recent to learn a few things gradually so I decided to follow a tutorial and now I'm stuck with an error I've researched but cannot still fix.
I have this
const postsSchema = require('./posts')
const resolvers = [
postsSchema.resolvers
]
const typeDefs = [
postsSchema.schema
]
module.exports = {
resolvers,
typeDefs
}
const trendingPosts = require('./mocks/trending')
const featuredPosts = require('./mocks/featured')
const fs = require('fs')
const path = require('path')
module.exports = {
resolvers: {
Query: {
trendingPosts: () => trendingPosts,
featuredPosts: () => featuredPosts,
recentPosts: () => [
...trendingPosts,
...featuredPosts,
...featuredPosts
]
}
},
schema: fs.readFileSync(
path.resolve(
__dirname,
'./posts-schema.graphql'
)
).toString
}
This is my GraphQl
type Query {
trendingPosts: [Post]!
featuredPosts: [Post]!
recentPosts: [Post]!
}
type Post {
id: Int,
title: String
date: String
categories: [String]
author: String
description: String
image: String
}
I'm quite sure I followed the whole process in the tutorial but when I run node app, I get this error in the terminal
buffer.js:778
return this.utf8Slice(0, this.length);
^
TypeError: Cannot read property 'utf8Slice' of undefined
at toString (buffer.js:778:17)
at C:\Users\Natey\Desktop\Code Related\my-app\graphql\node_modules\#graphql-tools\schema\index.cjs.js:195:65
at Array.forEach (<anonymous>)
at concatenateTypeDefs (C:\Users\Natey\Desktop\Code Related\my-app\graphql\node_modules\#graphql-tools\schema\index.cjs.js:191:24)
at buildDocumentFromTypeDefinitions (C:\Users\Natey\Desktop\Code Related\my-app\graphql\node_modules\#graphql-tools\schema\index.cjs.js:231:46)
at buildSchemaFromTypeDefinitions (C:\Users\Natey\Desktop\Code Related\my-app\graphql\node_modules\#graphql-tools\schema\index.cjs.js:213:22)
at makeExecutableSchema (C:\Users\Natey\Desktop\Code Related\my-app\graphql\node_modules\#graphql-tools\schema\index.cjs.js:811:32)
at Object.<anonymous> (C:\Users\Natey\Desktop\Code Related\my-app\graphql\app.js:8:13)
at Module._compile (internal/modules/cjs/loader.js:1063:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
I need help please, I'll really appreciate it.

Answer 1

As #pzaenger pointed out .toString should be .toString()
Edit:
The key here is to learn to read your stack traces.
buffer.js:778 // This is a node module
return this.utf8Slice(0, this.length);
^
TypeError: Cannot read property 'utf8Slice' of undefined // This is sort of helpful, it's telling use something is trying to access a function utf8Slice of undefined
at toString (buffer.js:778:17) // buffer.js is trying to access utf8Slice on a this object at `toString`
// So now we know a buffer is trying to call utf8Slice on an undefined `this`
// at `toString`. Taking a quick look at your code we see fs.readFileSync(...)
// which gives us a buffer back and then `fs.readFileSync(...).toString`
// experince tells us that toString is a function not a property