`anchorNorth`, `anchorSouth`, `anchorEast`, `anchorWest` work at runtime but not when type checking

[rudolfbyker]

Description

It seems that the <Node>s have snippets called anchorNorth, anchorSouth, anchorEast, and anchorWest. They work at runtime, and they are the most convenient way that I could find to put my custom anchors in the correct positions on the edges of the custom Node. However, they are not documented, and when running svelte-check, it tells me that I'm not allowed to use them:

Error: Object literal may only specify known properties, and 'anchorNorth' does not exist in type 'Properties<{ position?: { x: number; y: number; } | undefined; drop?: false | "center" | "cursor" | undefined; dimensions?: InitialDimensions | null | undefined; id?: string | number | undefined; ... 23 more ...; title?: string | undefined; }, { ...; }>'. (ts)

Reproduction

  <Node position={{ x: 100, y: 0 }} let:selected>
    <div
      class:selected
      class="border-surface-100-900 bg-primary-100-900 rounded-md border-1 p-4 text-lg font-bold"
    >
      The node
    </div>

    {#snippet anchorSouth()}
      <Anchor
        locked
        direction="south"
        output
        let:linked
      >
        <CircleChevronDown
          color={linked ? "green" : "gray"}
          class="rounded-full bg-white"
        />
      </Anchor>
    {/snippet}
  </Node>

Code sandbox coming soon ...

System information

  System:
    OS: Windows 10 10.0.19045
    CPU: (8) x64 11th Gen Intel(R) Core(TM) i7-1195G7 @ 2.90GHz
    Memory: 37.90 GB / 63.74 GB
  Binaries:
    Node: 22.14.0 - C:\Program Files\nodejs\node.EXE
    npm: 10.9.2 - C:\Program Files\nodejs\npm.CMD
    pnpm: 10.7.0 - C:\Program Files\nodejs\pnpm.CMD
  Browsers:
    Edge: Chromium (127.0.2651.86)
    Internet Explorer: 11.0.19041.4355
  npmPackages:
    @lucide/svelte: ^0.503.0 => 0.503.0
    svelte: ^5.28.2 => 5.28.2
    svelvet: ^11.0.5 => 11.0.5
    tailwindcss: ^4.1.4 => 4.1.4

Additional information

No response

👨‍👧‍👦 Contributing

• [ ] 🙋‍♂️ Yes, I'd love to make a PR to fix this bug!