AWS-serverless-express never resolving with promises

Make sure you are setting context.callbackWaitsForEmptyEventLoop to false

read more about it here https://docs.aws.amazon.com/lambda/latest/dg/nodejs-context.html

The issue was regarding my testing tool:

https://www.npmjs.com/package/run-local-lambda

When I spoke with the AWS Support, they told me to use:

sam local invoke "Test" -e event.json

With a event.json file that includes the following:

{    "httpMethod": "OPTIONS",    "//body": "{\"name\": \"Sam\"}",    "path": "/api/auth",    "resource": "/{proxy+}",    "queryStringParameters": {},    "pathParameters": {        "proxy": "users"    },    "headers": {        "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",        "Accept-Encoding": "gzip, deflate, sdch, br",        "Accept-Language": "en-US,en;q=0.8",        "CloudFront-Forwarded-Proto": "https",        "CloudFront-Is-Desktop-Viewer": "true",        "CloudFront-Is-Mobile-Viewer": "false",        "CloudFront-Is-SmartTV-Viewer": "false",        "CloudFront-Is-Tablet-Viewer": "false",        "CloudFront-Viewer-Country": "US",        "Content-Type": "application/json",        "Host": "xxxxxxxxxx.execute-api.us-east-1.amazonaws.com",        "Upgrade-Insecure-Requests": "1",        "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36",        "Via": "1.1 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.cloudfront.net (CloudFront)",        "X-Amz-Cf-Id": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx_xxxxxxxxxxx_xxxx==",        "X-Forwarded-For": "11.111.111.111, 11.111.111.111",        "X-Forwarded-Port": "111",        "X-Forwarded-Proto": "http",        "x-apigateway-event": "hej"    },    "requestContext": {        "accountId": "111111111111",        "resourceId": "xxxxxx",        "stage": "prod",        "requestId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",        "identity": {            "cognitoIdentityPoolId": "",            "accountId": "",            "cognitoIdentityId": "",            "caller": "",            "apiKey": "",            "sourceIp": "11.111.111.111",            "cognitoAuthenticationType": "",            "cognitoAuthenticationProvider": "",            "userArn": "",            "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36",            "user": ""        },        "resourcePath": "/{proxy+}",        "httpMethod": "GET",        "apiId": "xxxxxxxxxx"    }}

And a template file to use just for testing that looks like this:

AWSTemplateFormatVersion : '2010-09-09'Transform: AWS::Serverless-2016-10-31Description: A test projectResources: Test:  Type: AWS::Serverless::Function  Properties:   Runtime: nodejs10.x   Handler: index.handler   Timeout: 10   Environment:     Variables:       NODE_ENV: "test"       DB_NAME: "dbname"       DB_USER: "dbuser"       DB_PASSWORD: "secret"       DB_URL: "dburl"

The code I use looks like this in the handler:

'use strict'const awsServerlessExpress = require('aws-serverless-express')const app = require('./main.js')const server = awsServerlessExpress.createServer(app, null)    exports.handler = (event, context) => {  return awsServerlessExpress.proxy(server, event, context,'PROMISE').promise}

Then my code executed wonderful with no timeouts ever.