Svelte 5: The $bindable rune is only available inside .svelte and .svelte.js/ts files

[rob-balfre]

Describe the bug

If you accidentally omit the function parentheses on $bindable you get the wrong error message. Led to a few minutes of confusion!

Reproduction

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAAE0WMwQoCIRRFf0UeLQoG2psz0KafyBbj-IYERx_6DEL897AJWp7DPbfC6jxmkPcKYd4QJFyJYAB-U4f8Qs8IA-RY0tKNyktyxJMOmj2yqMIU5hjEKA7GBTsbj6J1ohQpH08XHdT5HwX12_ex5KfLY91N-37eYuzBriYYYIvWrQ4tSE4F26N9APYKwD-0AAAA

Logs

No response

System Info

System:
    OS: macOS 14.4.1
    CPU: (8) arm64 Apple M1
    Memory: 93.30 MB / 8.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.11.1 - ~/.nvm/versions/node/v20.11.1/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 10.2.4 - ~/.nvm/versions/node/v20.11.1/bin/npm
    pnpm: 8.15.7 - ~/pnpm/pnpm
    bun: 1.0.0 - ~/.bun/bin/bun
  Browsers:
    Chrome: 123.0.6312.122
    Firefox Nightly: 124.0a1
    Safari: 17.4.1
    Safari Technology Preview: 17.4
  npmPackages:
    svelte: ^5.0.0-next.103 => 5.0.0-next.103

Severity

annoyance

[harrisi]

This happens for all runes (or should - one is missing). Minimal reproduction.