[Bug]: Fails to bundle .svelte.ts files with TypeScript syntax #5081
Description
Reproduction link or steps
https://github.com/ilokhov/rolldown-svelte-ts/
What is expected?
Should successfully bundle on npm run build.
What is actually happening?
Getting the following error:
[plugin svelte] src/index.svelte.ts:1:7
SyntaxError: Unexpected token (1:7)
at En.raise (node_modules/svelte/compiler/index.js:1:91615)
at ln.unexpected (node_modules/svelte/compiler/index.js:1:35479)
at un.parseVar (node_modules/svelte/compiler/index.js:1:47505)
at un.parseVarStatement (node_modules/svelte/compiler/index.js:1:44613)
at un.parseStatement (node_modules/svelte/compiler/index.js:1:38823)
at un.parseTopLevel (node_modules/svelte/compiler/index.js:1:36780)
at an.parse (node_modules/svelte/compiler/index.js:1:32460)
at an.parse (node_modules/svelte/compiler/index.js:1:33735)
at qs (node_modules/svelte/compiler/index.js:1:223728)
at e.compileModule (node_modules/svelte/compiler/index.js:1:781190)
at normalizeErrors (node_modules/rolldown/dist/shared/src-DHXNdTPA.mjs:2321:18)
at handleOutputErrors (node_modules/rolldown/dist/shared/src-DHXNdTPA.mjs:3256:34)
at transformToRollupOutput (node_modules/rolldown/dist/shared/src-DHXNdTPA.mjs:3250:2)
at RolldownBuild.write (node_modules/rolldown/dist/shared/src-DHXNdTPA.mjs:4459:10)
at async bundleInner (node_modules/rolldown/dist/cli.mjs:1583:16)
at async bundleWithConfig (node_modules/rolldown/dist/cli.mjs:1499:7)
at async main (node_modules/rolldown/dist/cli.mjs:1733:3)
System Info
System:
OS: macOS 15.5
CPU: (10) arm64 Apple M1 Max
Memory: 367.64 MB / 32.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 22.14.0 - ~/.nvm/versions/node/v22.14.0/bin/node
npm: 10.9.2 - ~/.nvm/versions/node/v22.14.0/bin/npm
pnpm: 10.12.1 - ~/.nvm/versions/node/v22.14.0/bin/pnpm
Browsers:
Chrome: 138.0.7204.49
Safari: 18.5
npmPackages:
rolldown: ^1.0.0-beta.20 => 1.0.0-beta.20Any additional comments?
I'm using rollup-plugin-svelte to bundle Svelte. In Svelte 5 it's possible to define reactive state inside .svelte.ts files. However using combination of rolldown and rollup-plugin-svelte results in an error when trying to bundle - it looks like TypeScript syntax is not recognised in .svelte.ts files.
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