Closed
Description
Describe the bug
This call here...
...isn't passing experimental.async through, meaning that if someone has a $derived(await ...) in a .svelte.js or .svelte.ts module, it will blow up. (The option should only be added if it's been provided, of course, otherwise it'll fail validation)
Reproduction URL
https://github.com/sveltejs/svelte
Reproduction
Add the following to any *.svelte.[js|ts] file:
async function foo() {
let x = $derived(await 1);
}Logs
System Info
System:
OS: macOS 15.5
CPU: (10) arm64 Apple M1 Pro
Memory: 89.95 MB / 32.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 22.15.1 - ~/.nvm/versions/node/v22.15.1/bin/node
npm: 10.9.2 - ~/.nvm/versions/node/v22.15.1/bin/npm
pnpm: 10.11.0 - ~/.nvm/versions/node/v22.15.1/bin/pnpm
bun: 1.0.10 - ~/.bun/bin/bun
Browsers:
Chrome: 138.0.7204.101
Chrome Canary: 124.0.6316.0
Safari: 18.5
Safari Technology Preview: 18.4
npmPackages:
@sveltejs/adapter-auto: ^6.0.0 => 6.0.1
@sveltejs/kit: ^2.22.0 => 2.22.5
@sveltejs/vite-plugin-svelte: ^6.0.0 => 6.0.0
svelte: https://pkg.pr.new/svelte@15844 => 5.28.2
vite: ^7.0.4 => 7.0.4