Causes javascript error

Was just trying the package on one of my apps and got this error showing in the browser console. Impact on the app is a ggplot not appearing.

```
Uncaught TypeError: event.binding is undefined
line 2 > injectedScript:160
jQuery 7
value shinyapp.ts:556
value shinyapp.ts:736
value shinyapp.ts:717
value shinyapp.ts:700
onmessage shinyapp.ts:350
value shinyapp.ts:349
value shinyapp.ts:277
vy init.ts:425
gy index.ts:56
setTimeout handler*gy/< index.ts:55
jQuery 13
e
t
setTimeout handler*l/<
c
fireWith
fire
c
fireWith
ready
B
EventListener.handleEvent*


```

Location of error:


Reproduce the browser-console error in a Shiny app and follow the stack through shinyapp.ts, init.ts, and index.ts, especially the listed event-handling locations. Determine why the ggplot does not appear when event.binding is undefined; done means the error no longer occurs and the plot renders.

Written by the indexing model from the issue text.