Uncaught (in promise) TypeError: Object(...) is not a function

I'm getting the following exception when running the DynamoDB example (after publishing the worker with wrangler).

```
worker.js:16 Uncaught (in promise) TypeError: Object(...) is not a function
at worker.js:16
at Array.reduce ()
at u (worker.js:16)
at Object.resolve (worker.js:16)
at t.resolveMiddleware (worker.js:76)
at t.e.send (worker.js:16)
at worker.js:46
at worker.js:46
at worker.js:46
```

Start by reproducing the DynamoDB example after publishing the worker with wrangler and inspect the stack trace around worker.js:16, worker.js:46, and worker.js:76. Determine the cause of the uncaught TypeError and confirm that the published example runs without this exception.

Written by the indexing model from the issue text.