Probot receive errors with "TypeError: appFn is not a function"

Bug Report

Current Behavior I’m testing locally with the node_modules/.bin/probot receive -e pull_request ... command.

I get an TypeError: appFn is not a function.

The reason might because I’ve set up my main function as follows (since this project deploys to serverless):

export function handler(app: Application) {
  app.on(['pull_request.opened'], async context => {...}
};

probot run npm start works just fine. This only happens when I call probot receive. Any tips here would be appreciated. Thank you!

Environment

• Probot version(s): “version”: “10.9.0”
• Node/npm version: “>= 12.18.2”
• OS: OS 10.15.6

[gr2m]

Can you try to export the function as default?

export default function handler(app: any) {
  app.on(['pull_request.opened'], async context => {}
};

[losalex]

Just to provide a possible solution for people who encounter same issue - I was able to solve the problem by simply exporting default anonymous function, e.g.:

export = (app: Probot) => {
};