Random `Function failed on loading user code. Error message:` with no error message

[REQUIRED] Environment info

firebase-tools: 7.12.1

Windows 10

[REQUIRED] Test case

Deploying any function ever.

[REQUIRED] Steps to reproduce

Deploy more than one function. Half of the time, one or more will fail with

Function failed on loading user code. Error message: and nothing else.

[REQUIRED] Expected behavior

Please give me information so I know why the deploy failed.

[REQUIRED] Actual behavior

I get no useful information and have to restart builds all the time.

[armordog]

Hey @samtstern!

I talked to Firebase support and they helped me understand enough to fix it. =]

Turns out that in my firebase logs I was getting something like

{"@type":"type.googleapis.com/google.cloud.audit.AuditLog","status":{"code":3,"message":"INVALID_ARGUMENT"},"authenticationInfo":{"principalEmail":"[e-mail]"},"requestMetadata":{"requestAttributes":{},"destinationAttributes":{}},"serviceName":"cloudfunctions.googleapis.com","methodName":"google.cloud.functions.v1.CloudFunctionsService.UpdateFunction","resourceName":"projects/gitl-firebase-dev/locations/us-central1/functions/offerPush"}

which apparently means that the function timed out on its initial startup.

So I needed to move some of my top-level requires inside the functions so they don’t happen on cold-start.

I just thought you (or anyone who finds this later) would like to know.

Thanks again!

[Enzo-21]

Check if you have some dependencies installed on your root folder. You should have all your modules installed inside the functions folder. Only firebase dependencies should be in your root folder. Try to do npm uninstall yourDependencie inside your root folder and then npm i yourDependencie inside root/functions folder.