All api requests return 404 not found -- can't troubleshoot

**Describe the bug**

I use NodeJS v4 API functions. If there is an error on the root level of any function (or imported) file, no HTTP handlers are registered, therefore, every request returns 404 Not Found.

However, it is impossible to troubleshoot such errors because they don't show up in the deployment log.

**To Reproduce**
Add the following code to the top of an API function file, before `app.http(...)`:
```
const OpenAI = require('openai');
const openai = new OpenAI({apiKey: process.env.OPENAI_API_KEY});
```
if `OPENAI_API_KEY` is not set in your environment, the function will throw an error and other handlers will not be registered. However, the build log will say that the build was successful.

**Expected behavior**
I expect the build to fail and the build log to contain the description of the error.