Investigation

[kresnasatya]

Command tsc && vite build will throw error for Svelte TS.

[kresnasatya]

It's a Inertia package problem. Submitted in: inertiajs/inertia#2075

[edjw]

I think it was because of not checking for the existence of el in app.ts

[kresnasatya]

Hi Ed, sorry for late reply. You're right. But, if we add a checker into the app.ts file then the code program will be increased a bit. If we check in Laravel Breeze (Inertia Vue & React) it doesn't add any check of el.

Inertia + Vue TS: https://github.com/laravel/breeze/blob/a6d02b0ad5a03e7ab12546bf978be33e5c77f806/stubs/inertia-vue-ts/resources/js/app.ts#L19

Inertia + React TS: https://github.com/laravel/breeze/blob/a6d02b0ad5a03e7ab12546bf978be33e5c77f806/stubs/inertia-react-ts/resources/js/app.tsx#L18

My intuition towards on the Inertia Svelte package itself in this code: https://github.com/inertiajs/inertia/blob/9106d74495130a3d82d00daec43c4042b81bdb63/packages/svelte/src/createInertiaApp.ts#L14

The author do that because of PR inertiajs/inertia#2037

Anyway, let the el checker exist in the app.ts in this moment. I will close this issue. Thank you.