"Unsupported environment variable format" when running serverless

Question

After code changes in stocks_alert.js based on client requirements, the error persisted when I try to run "Serverless invoke local -f stocks_alert".

Here's the complete error:

Error:
   Could not resolve "appsyncUrl" environment variable: Unsupported environment variable format:        {'Fn::GetAtt': [ 'GraphQlApi', 'GraphQLUrl' ] }

and the error pinpoints to the configuration from serverless.yml & invokelocalvar.yml:

Actual invokelocalvar.yml:

PROD:
 userPoolId: !ImportValue IQOS-UserPoolId-${self:custom.stage}
 appsyncUrl: !GetAtt GraphQlApi.GraphQLUrl
 appsyncApiKey: !GetAtt GraphQlApiKeyDefault.ApiKey
 clientId: !ImportValue "IQOS-UserWebclient-${self:custom.stage}"

LOCAL_PRE:
 userPoolId: ap-southeast-1_UWp5U3ImF
 appsyncUrl: https://lgrsmv2pgvdexogm2enpphiwji.appsync-api.ap-southeast-    1.amazonaws.com/graphql
 appsyncApiKey: da2-5mu4rrerq5fofcseyfal3zfzm4
 clientId: 49jgb26kp598r7g244tlfnh5ie

LOCAL_PROD:
 userPoolId: ap-southeast-1_TLwFqBRKT
 appsyncUrl: https://dsjyeun425bl7knwvquyejngwu.appsync-api.ap-southeast-1.amazonaws.com/graphql
 appsyncApiKey: da2-mwji6z7y3nbovhzwzhnd3ahaeu
 clientId: 4obtjmi3sq4lfbvlo1l149359m

This is from serverless.yml:

Actual config from serverless (under environment)

 appsyncUrl: !GetAtt GraphQlApi.GraphQLUrl
 appsyncApiKey: !GetAtt GraphQlApiKeyDefault.ApiKey

How do I resolve this kind of issue?

I already tried to modify the value of config from appsyncUrl and appsyncapiKey to put !ImportValue but I realize that the purpose of this is if the two configuration is running on different cloudformation stack, and I've already tried commenting out the two configurations(appsyncUrl & AppsyncapiKey) from serverless.yml because I though there's duplication of configuration in serverless.yml and invokelocalvar.yml.

My expectation is that running serverless invoke local -f stocks_alert succeeds, it will trigger the stocks_alert and sending alert to all recipients the low stock inventory of each warehouses via email.

lhmt · Accepted Answer · 2025-08-05 03:14:17Z

0

Without looking at your full setup, I guess the problem is that serverless invoke local does not support all of the AWS CloudFormation intrinsic functions.

One solution is to use serverless-export-env plugin, basically follow the instruction in the Custom Resource Resolution section to map the !GetAtt to something else that works in the local environment.

edited Aug 5 at 3:14

answered Aug 5 at 3:05

lhmt

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