[Bug] Story generator adds last char into story

[RSWilli]

Describe the bug

The story generator adds the last char into the story as markup. If the file ends with a newline then it isn't obvious but other chars are visible:

Steps to reproduce the behavior

Remove the last newline of any stories.svelte. The story will always contain the last char.

A story like:

<script module lang="ts">
    // ...
</script>

<script lang="ts">
    // ...
</script>

<Story name="primary" {args}>
    {#snippet template(args: Props)}
        <Button {...args}>Save</Button>
        <Button {...args}>Save</Button>
    {/snippet}
</Story>
foo

will produce the following (must remove the newline at the end!):

If the last char is the > of the </Story> then this is also added to the markup. Not sure if this can be used in any malicous way?

Expected behavior

Only story markup.

Environment

  System:
    OS: Linux 6.12 Arch Linux
    CPU: (8) x64 Intel(R) Core(TM) i5-8350U CPU @ 1.70GHz
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 24.0.1 - ~/.nvm/versions/node/v24.0.1/bin/node
    Yarn: 1.22.22 - /usr/bin/yarn
    npm: 11.6.0 - ~/.nvm/versions/node/v24.0.1/bin/npm <----- active
  npmPackages:
    @storybook/addon-essentials: ^8.6.7 => 8.6.14 
    @storybook/addon-interactions: ^8.6.7 => 8.6.14 
    @storybook/addon-links: ^8.6.7 => 8.6.14 
    @storybook/addon-svelte-csf: ^5.0.0-next.11 => 5.0.8
    @storybook/blocks: ^8.6.7 => 8.6.14 
    @storybook/svelte: ^8.6.7 => 8.6.14 
    @storybook/sveltekit: ^8.6.7 => 8.6.14 
    @storybook/test: ^8.6.7 => 8.6.14 
    @storybook/testing-library: ^0.2.2 => 0.2.2 
    storybook: ^8.6.7 => 8.6.14 

Not sure if also present in storybook v9