Firebase Functions Express throwing an error: "Cannot find handler function"

As I delve into using Firebase functions with Express, following the Firebase documentation, I find myself passing my Express app as an argument for onRequest:

exports.myFunction = functions.https.onRequest(app);

This approach works seamlessly.

In an effort to optimize performance and minimize cold starts, I aim to prevent my app from scaling down to 0 instances. However, I encounter a roadblock when trying to pass options along with my app:

exports.myFunction = functions.https.onRequest({
    minInstances: 2,
  }, app);

An error stating "TypeError: handler is not a function" crops up in my functions logs...

javascriptfirebaseexpressgoogle-cloud-functions

Answer №1

If you need guidance on setting minInstances for first gen functions, take a look at the documentation for helpful examples. Utilize runWith in your function setup like this:

exports.yourFunction = functions
    .runWith({
      minInstances: XX,
    })
    .https.onRequest(app);

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