writeBundle error with vite.build function call

[Intexk]

Describe the bug

this call in writeBundle asumes vite.build returns a {import('vite').Rollup.RollupOutput}
but vite.build can return one array too...

build function in vite source code

async function build(
  inlineConfig?: InlineConfig,
): Promise<RollupOutput | RollupOutput[]>

writeBundle in svelteKit

const { output } = /** @type {import('vite').Rollup.RollupOutput} */ (
	await vite.build({
		configFile: vite_config.configFile,
		// CLI args
		mode: vite_config_env.mode,
		logLevel: vite_config.logLevel,
		clearScreen: vite_config.clearScreen,
		build: {
			minify: initial_config.build?.minify,
			assetsInlineLimit: vite_config.build.assetsInlineLimit,
			sourcemap: vite_config.build.sourcemap
		},
		optimizeDeps: {
			force: vite_config.optimizeDeps.force
		}
	})
);

after that the build crashes....so i have to manually patch the sveltekit each time i update it.

Reproduction

i created this project....it's vite legacy plugin the one that triggers the build error in sveltekit

https://github.com/Intexk/tontada

Logs

No response

System Info

System:
    OS: Windows 10 10.0.19045
    CPU: (16) x64 AMD Ryzen 9 5900HX with Radeon Graphics
    Memory: 47.33 GB / 63.42 GB
  Binaries:
    Node: 20.11.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.21 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 10.4.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Chromium (129.0.2792.65)
    Internet Explorer: 11.0.19041.4355
  npmPackages:
    @sveltejs/adapter-static: ^3 => 3.0.8
    @sveltejs/kit: ^2 => 2.15.2
    @sveltejs/vite-plugin-svelte: ^5.0.0 => 5.0.3
    svelte: ^5.0.0 => 5.17.3
    vite: ^6.0.7 => 6.0.7

Severity

serious, but I can work around it

Additional Information

No response

[eltigerchino]

Please provide a minimal reproduction where the build crashes.

[Intexk]

the crash happens in this line

kit/packages/kit/src/exports/vite/index.js

Line 859 in 5b667e4

uses_env_dynamic_public: output.some(

error during build:
[vite-plugin-sveltekit-compile] Cannot read properties of undefined (reading 'some')
at Object.handler (xxx/node_modules/@sveltejs/kit/src/exports/vite/index.js:859:39)

[Intexk]

i created this project....it's vite legacy plugin the one that triggers the build error in sveltekit

https://github.com/Intexk/tontada