If it helps anyone:

    {
        files: ["**/*.svelte", "**/*.svelte.ts"],
        languageOptions: {
            parserOptions: {
                projectService: true,
                extraFileExtensions: [".svelte", ".svelte.ts"],
                parser: ts.parser,
                svelteFeatures: {
                    experimentalGenerics: true,
                },
                svelteConfig,
            },
        },
    },

I'm still getting this with config from README (without svelteConfig).

It happens when I have on inline handlers that are multiline.

                onchange={async event => {
                  const input = event.target as HTMLInputElement
                  const file = input.files?.[0]

                  if (file) {
                    const img = document.querySelectorAll(`form img`)[
                      index
                    ] as HTMLImageElement
                    img.src = URL.createObjectURL(file)
                  }
                }}

It happens when I have on inline handlers that are multiline.

Scratch that, it happens with TS inside handlers.

...and it looks like also when you have async functions in handlers:

        onsubmit={async ()=> {}}

@Lippiece I can not reproduce this. Can you create a new issue with reproduction?

@Lippiece I can not reproduce this. Can you create a new issue with reproduction?

Thanks for checking this out. I couldn't do it. The same config works if eslint is installed locally, but not globally. Maybe someone else will have an idea.

...looks like the problem was in svelte package missing globally. Silly me.