Use strict mode for scripts.

api/schema.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const { GraphQLSchema } = require('graphql')
 const { MutationType } = require('./types/Mutation')
 const { QueryType } = require('./types/Query')

api/server.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const { createWriteStream, unlink } = require('fs')
 const { ApolloServer } = require('apollo-server-koa')
 const Koa = require('koa')

api/types/File.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const {
   GraphQLNonNull,
   GraphQLObjectType,

api/types/Mutation.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const { GraphQLUpload } = require('apollo-server-koa')
 const { GraphQLList, GraphQLObjectType, GraphQLNonNull } = require('graphql')
 const promisesAll = require('promises-all')

api/types/Query.js

@@ -1,3 +1,5 @@
+'use strict'
+
 const { GraphQLList, GraphQLObjectType, GraphQLNonNull } = require('graphql')
 const { FileType } = require('./File')