Vite build fails with svelte v5.35.1

[PratyushJayachandran]

Describe the bug

I am getting this error when I try to build my tauri app. The function it is complaining about is setInterval(() => {}, 50). I haven't touched this code at all. Just updated to Svelte v5.35.1 from v5.34.8

Console Output:

PS D:\foo> deno task tauri build
Task tauri tauri "build"
        Warn The bundle identifier "com.bar.app" set in `tauri.conf.json identifier` ends with `.app`. This is not recommended because it conflicts with the application bundle extension on macOS.
     Running beforeBuildCommand `deno task build`
Task build vite build
▲ [WARNING] Cannot find base config file "./.svelte-kit/tsconfig.json" [tsconfig.json]

    tsconfig.json:2:13:
      2 │   "extends": "./.svelte-kit/tsconfig.json",
        ╵              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vite v7.0.0 building SSR bundle for production...
✓ 187 modules transformed.
✗ Build failed in 916ms
error during build:
src/routes/+page.svelte (182:7): Expected ',', got 'numeric literal (50, 50)' (Note that you need plugins to import files that are not JavaScript)
file: D:/foo/bar/src/routes/+page.svelte:182:7

180:         ui("#enable-permanent-lock-dialog");
181:       }
182:     }, 50); // 50ms interval for 5 seconds total
            ^
183:   }

    at getRollupError (file:///D:/foo/node_modules/.deno/rollup@4.44.1/node_modules/rollup/dist/es/shared/parseAst.js:401:41)
    at ParseError.initialise (file:///D:/foo/node_modules/.deno/rollup@4.44.1/node_modules/rollup/dist/es/shared/node-entry.js:14309:28)
    at convertNode (file:///D:/foo/node_modules/.deno/rollup@4.44.1/node_modules/rollup/dist/es/shared/node-entry.js:16213:10)
    at convertProgram (file:///D:/foo/node_modules/.deno/rollup@4.44.1/node_modules/rollup/dist/es/shared/node-entry.js:15456:12)
    at Module.setSource (file:///D:/foo/node_modules/.deno/rollup@4.44.1/node_modules/rollup/dist/es/shared/node-entry.js:17205:24)
    at async ModuleLoader.addModuleSource (file:///D:/foo/node_modules/.deno/rollup@4.44.1/node_modules/rollup/dist/es/shared/node-entry.js:21218:13)
beforeBuildCommand `deno task build` failed with exit code 1
       Error beforeBuildCommand `deno task build` failed with exit code 1

Reproduction

I am unable to share the project but updating to svelte v5.35.1 from v5.34.8 introduced this issue

Logs

System Info

deno v2.4.0,
svelte v5.35.1,
vite v7.0.0,
@sveltejs/vite-plugin-svelte v5.1.0,
@sveltejs/kit v2.22.2,

Severity

blocking an upgrade

[Ocean-OS]

Without a reproduction we are missing some serious context here. Could you take a look at #16286 and see if this is your issue?

[PratyushJayachandran]

Without a reproduction we are missing some serious context here. Could you take a look at #16286 and see if this is your issue?

Looks like the same issue!

Thank you Svelte Team, I see the fix has been made in Svelte v5.35.2!