How to use the graphql-upload.GraphQLUpload function in graphql-upload

) => DocumentNode = gqlTag;

import runtimeSupportsUploads from './utils/runtimeSupportsUploads';
import { GraphQLScalarType } from 'graphql';
export { default as processFileUploads } from './processFileUploads';

// This is a conditional export intended to avoid traversing the
// entire module tree of `graphql-upload`.  This only defined if the
// version of Node.js is >= 8.5.0 since those are the only Node.js versions
// which are supported by `graphql-upload@8`.  Since the source of
// `graphql-upload` is not transpiled for older targets (in fact, it includes
// experimental ECMAScript modules), this conditional export is necessary
// to avoid modern ECMAScript from failing to parse by versions of Node.js
// which don't support it (yet — eg. Node.js 6 and async/await).
export const GraphQLUpload = runtimeSupportsUploads
  ? (require('graphql-upload').GraphQLUpload as GraphQLScalarType)
  : undefined;

"use strict";
/*
  GraphQL Plugin default options for base schema and resolvers
*/
Object.defineProperty(exports, "__esModule", { value: true });
const tslib_1 = require("tslib");
const apollo_server_caching_1 = require("apollo-server-caching");
const graphql_upload_1 = require("graphql-upload");
const graphql_type_json_1 = require("graphql-type-json");
const graphql_iso_date_1 = require("graphql-iso-date");
// TODO: as preset
delete graphql_upload_1.GraphQLUpload.description;
delete graphql_type_json_1.GraphQLJSON.description;
delete graphql_iso_date_1.GraphQLDate.description;
delete graphql_iso_date_1.GraphQLDateTime.description;
delete graphql_iso_date_1.GraphQLTime.description;
const typeDefs = [];
const resolvers = {};
/* default scalar types */
typeDefs.push(`
"""
Upload scalar type
@input: [GraphQL multipart request spec](https://github.com/jaydenseric/graphql-multipart-request-spec)
@output: { filename, mimetype, encoding, createReadStream }
filename          string    File name.
mimetype          string    File MIME type. Provided by the client and can’t be trusted.
encoding          string    File stream transfer encoding.
createReadStream  Function  Returns a Node.js readable stream of the file contents, for processing and storing the file. Multiple calls create independent streams. Throws if called after all resolvers have resolved, or after an error has interrupted the request.

const typeDefs = [];
const resolvers = {};
/* default scalar types */
typeDefs.push(`
"""
Upload scalar type
@input: [GraphQL multipart request spec](https://github.com/jaydenseric/graphql-multipart-request-spec)
@output: { filename, mimetype, encoding, createReadStream }
filename          string    File name.
mimetype          string    File MIME type. Provided by the client and can’t be trusted.
encoding          string    File stream transfer encoding.
createReadStream  Function  Returns a Node.js readable stream of the file contents, for processing and storing the file. Multiple calls create independent streams. Throws if called after all resolvers have resolved, or after an error has interrupted the request.
"""
scalar Upload
`);
resolvers.Upload = graphql_upload_1.GraphQLUpload;
typeDefs.push(`
"""
JSON scalar type
@input: JSON string
@output: Result of JSON.parse(@input)
"""
scalar JSON
`);
resolvers.JSON = graphql_type_json_1.GraphQLJSON;
typeDefs.push(`
"""
Date scalar type
@input: RFC3339 full-date string: "2007-12-03"
@output: Date instance
"""
scalar Date