TypeError: handler is not a function using Firebase and DialogFlow with Google Actions

Question

I keep getting this error message in Firebase functions/logs

dialogflowFirebaseFulfillment
 TypeError: handler is not a function
    at cloudFunction (/srv/node_modules/firebase-functions/lib/providers/https.js:57:9)
    at /worker/worker.js:783:7
    at /worker/worker.js:766:11
    at _combinedTickCallback (internal/process/next_tick.js:132:7)
    at process._tickDomainCallback (internal/process/next_tick.js:219:9)

Originally my actions on google project was working fine, I just got mp3s playing, referencing new user or returning user, etc, everything worked then all of a sudden this error started appearing though I never edited https.js, I have no idea why this error just started anyone familiar with this?

The error is in a library, but suggests that there may be something incorrect about how you're registering your firebase function. Please update your question to show the code you're using, particularly if you have a function named dialogflowFirebaseFulfillment — Prisoner
– Prisoner, Commented May 23, 2019 at 16:27
Thanks, I already started over from scratch and had deleted all that code unfortunately. — Steven
– Steven, Commented May 25, 2019 at 16:42

nilsqwertz · Accepted Answer · 2019-09-17 12:47:28Z

2

For others encountering this error: For me it was an incorrect function registration. I registered my function as a standard https-function with onRequest and tried calling it as a callable function. Changing the registration to use onCall solved this issue.

answered Sep 17, 2019 at 12:47

nilsqwertz

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