chore: update node version to 14 (#6)

Author: akashjain971

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:12-alpine as build
+FROM node:14-alpine as build
 
 RUN apk add python make g++
 WORKDIR /app
@@ -13,7 +13,7 @@ RUN npm run build && if [[ "$nodeEnv" == "production" ]]; then mv node_modules/n
 # Used just for tests
 ENTRYPOINT [ "npm", "run" ]
 
-FROM node:12-alpine
+FROM node:14-alpine
 ENV NODE_ENV production
 RUN adduser app -h /app -D
 USER app

src/dgraph.ts

@@ -2,16 +2,16 @@ import fetch from 'node-fetch';
 import { GraphQLResponse, AuthHeaderField } from '@slash-graphql/lambda-types';
 
 export async function graphql(query: string, variables: Record<string, any> = {}, authHeader: AuthHeaderField): Promise<GraphQLResponse> {
-  const headers: Record<string,string> = { "Content-Type": "application/json" };
-  if(authHeader && authHeader.key && authHeader.value) {
+  const headers: Record<string, string> = { "Content-Type": "application/json" };
+  if (authHeader && authHeader.key && authHeader.value) {
     headers[authHeader.key] = headers[authHeader.value];
   }
   const response = await fetch(`${process.env.DGRAPH_URL}/graphql`, {
     method: "POST",
     headers,
-    body: JSON.stringify({query, variables})
+    body: JSON.stringify({ query, variables })
   })
-  if(response.status !== 200) {
+  if (response.status !== 200) {
     throw new Error("Failed to execute GraphQL Query")
   }
   return response.json();
@@ -36,7 +36,7 @@ async function dqlMutate(mutate: string): Promise<GraphQLResponse> {
   const response = await fetch(`${process.env.DGRAPH_URL}/mutate?commitNow=true`, {
     method: "POST",
     headers: {
-      "Content-Type": "pplication/rdf",
+      "Content-Type": "application/rdf",
       "X-Auth-Token": process.env.DGRAPH_TOKEN || ""
     },
     body: mutate