Svelte build fails: Unexpected token `;`

[MSchmoecker]

I am getting the following error after updating from esrap 1.4.5 to 1.4.6:

$ npm run build

> thymis-frontend@0.5.0-dev build
> vite build

SvelteKit reloading version: dd2d792f89cbe19d6b25af3c4f3ed87af5018c30-dirty-1743934782760
vite v6.2.5 building SSR bundle for production...
✓ 91 modules transformed.
✗ Build failed in 1.22s
error during build:
src/lib/components/secrets/SecretEditModal.svelte (53:6): Unexpected token `;`. Expected ... , *,  (, [, :, , ?, = or an identifier (Note that you need plugins to import files that are not JavaScript)
file: /home/nixos/thymis/frontend/src/lib/components/secrets/SecretEditModal.svelte:53:6

51: 
52: const dispatch = createEventDispatcher<{
53:   close: void;
           ^
54:   saved: { id: string; display_name: string };
55:   download: void;

    at getRollupError (file:///home/nixos/thymis/frontend/node_modules/rollup/dist/es/shared/parseAst.js:397:41)
    at ParseError.initialise (file:///home/nixos/thymis/frontend/node_modules/rollup/dist/es/shared/node-entry.js:14219:28)
    at convertNode (file:///home/nixos/thymis/frontend/node_modules/rollup/dist/es/shared/node-entry.js:16113:10)
    at convertProgram (file:///home/nixos/thymis/frontend/node_modules/rollup/dist/es/shared/node-entry.js:15356:12)
    at Module.setSource (file:///home/nixos/thymis/frontend/node_modules/rollup/dist/es/shared/node-entry.js:17101:24)
    at async ModuleLoader.addModuleSource (file:///home/nixos/thymis/frontend/node_modules/rollup/dist/es/shared/node-entry.js:21045:13)

Here is the source code (https://github.com/Thymis-io/thymis/blob/master/frontend/src/lib/components/secrets/SecretEditModal.svelte#L52-L60)

const dispatch = createEventDispatcher<{
	close: void;
	saved: { id: string; display_name: string };
	download: void;
	fileChange: Event;
	addEnvVariable: void;
	removeEnvVariable: number;
	error: string;
}>();

[manuel3108]

Are you able to reproduce this error inside the REPL? I tried but did not have any luck.

Also, I tried putting the code mentioned in the esrap testsuite locally, but everything worked as expected.

[MSchmoecker]

Unfortunately, I wasn't able to create a minimal project where the error occurs. Likely some rollup plugin or similar is required to produce an incompatible AST.

That said, my current project builds without issues when using esrap version 1.4.5. However, updating to version 1.4.6 consistently triggers the error.

I'll let you know as soon as I can isolate the problem and provide more detailed steps, but I wanted to report this in case it's related to an obvious change.

[manuel3108]

Great, thank you. Nothing looks suspicious in my opinion here: #55

[elikoga]

This is an instance of sveltejs/svelte#15659 we encountered due to the svelte dep being pinned instead of correctly semver guarded. Renovate updated esrap independently from svelte and this is one of the resulting errors