Warning: a promise was created in a handler but was not returned from it

[olivierto]

This is a Bug Report

Description

• What went wrong? When deploying stepfunction a warning appears in console, that breaks serverless cli output (but deployment works).
• What did you expect should have happened? Step function deploying with serverless output in cli as expected.
• What was the config you used?

  "serverless": "^3.32.2",
    "serverless-esbuild": "^1.45.1",
    "serverless-pseudo-parameters": "^2.6.1",
    "serverless-step-functions": "^3.13.1",

• What stacktrace or error message from your provider did you see?

(node:94860) Warning: a promise was created in a handler at internal/timers.js:464:21 but was not returned from it, see http://goo.gl/rRqMUw
    at Function.Promise.cast (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/bluebird/js/release/promise.js:225:13)
    at /Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless-step-functions/lib/deploy/stepFunctions/compileStateMachines.js:272:26
    at Array.forEach (<anonymous>)
    at ServerlessStepFunctions.compileStateMachines (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless-step-functions/lib/deploy/stepFunctions/compileStateMachines.js:94:34)
    at processImmediate (internal/timers.js:464:21)
From previous event:
    at package:compileFunctions (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless-step-functions/lib/index.js:123:10)
    at PluginManager.runHooks (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless/lib/classes/plugin-manager.js:530:15)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at async PluginManager.invoke (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless/lib/classes/plugin-manager.js:564:9)
    at async PluginManager.spawn (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless/lib/classes/plugin-manager.js:585:5)
    at async before:deploy:deploy (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless/lib/plugins/deploy.js:40:11)
    at async PluginManager.runHooks (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless/lib/classes/plugin-manager.js:530:9)
    at async PluginManager.invoke (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless/lib/classes/plugin-manager.js:563:9)
    at async PluginManager.run (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless/lib/classes/plugin-manager.js:604:7)
    at async Serverless.run (/Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless/lib/serverless.js:179:5)
    at async /Users/olito/Documents/sources/Lambdas/MyStepFunc/node_modules/serverless/scripts/serverless.js:834:9

Additional Data

• Serverless Framework Core Version you're using: ^3.32.2"
• The Plugin Version you're using: ^3.13.1
• Operating System: Mac OS Apple M1 Pro on Ventura