Resolvers for File Upload Mutations

resolvers.js

const resolvers = {
  Mutation: {
    singleUpload: (parent, args) => {
      return args.file.then(file => {
        const {createReadStream, filename, mimetype} = file

        const fileStream = createReadStream()

        fileStream.pipe(fs.createWriteStream(`./uploadedFiles/${filename}`))

        return file;
      });
    },
    singleUploadStream: async (parent, args) => {
      const file = await args.file
      const {createReadStream, filename, mimetype} = file
      const fileStream = createReadStream()

      //Here stream it to S3
      // Enter your bucket name here next to "Bucket: "
      const uploadParams = {Bucket: 'apollo-file-upload-test', Key: filename, Body: fileStream};
      const result = await s3.upload(uploadParams).promise()

      console.log(result)


      return file;
    }
  },
};