New App - Garden code example not working?

Hello all!  I am kinda new to React and want to try updating my existing custom app using the new scaffold.

I started a new app in ZCLI with the react scaffold and it works locally (I see the list of orgs).

However, if I copy the code from https://garden.zendesk.com/components/autocomplete Default layout and replace the contents of app.js with it, I get the following error:

/src/javascripts/modules/app.js: Unexpected token, expected "," (40:19)

  38 |    */
  39 |   const filterMatchingOptionsRef = useRef(
> 40 |     debounce((value: string) => {
     |                    ^
  41 |       const matchedOptions = options.filter(
  42 |         option => option.trim().toLowerCase().indexOf(value.trim().toLowerCase()) !== -1
  43 |       );

Any ideas what I am doing wrong?  I made no other modification to the scaffold created by zcli.

Also to note, I have tried this using npm and yarn - same issue.