Error deploying vite + react application to Heroku

I'm trying to deploy my app to Heroku. When I run npm build on my machine, it works. But when Heroku runs npm build, it cannot transform a module in my app.

The build log gives the following:

Build
       Running build
       
       > taleme@1.0.0 build
       > vite build
       
       vite v2.7.10 building for production...
       transforming...
       ✓ 32 modules transformed.
Could not resolve './taleme/LocalMultiplayer' from src/Game.tsx
error during build:
Error: Could not resolve './taleme/LocalMultiplayer' from src/Game.tsx
    at error (/tmp/build_fa45ef37/node_modules/vite/node_modules/rollup/dist/shared/rollup.js:158:30)
    at ModuleLoader.handleResolveId (/tmp/build_fa45ef37/node_modules/vite/node_modules/rollup/dist/shared/rollup.js:22384:24)
    at /tmp/build_fa45ef37/node_modules/vite/node_modules/rollup/dist/shared/rollup.js:22363:26
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
[!] Error: unfinished hook action(s) on exit:
(vite:css) transform "/tmp/build_fa45ef37/src/index.css"
(vite:load-fallback) load "/tmp/build_fa45ef37/src/taleme/LobbyView.tsx"

When I try to temporarily remove this import, a different module imported somewhere else pops in with this error.
I've got no clue as to why vite cannot perform the transform on Heroku.

Any help would be greatly appreciated!