Start: SSR dehydrated script output contains unnecessary whitespace/newlines

Which project does this relate to?

Start

Describe the bug

The inline <script> blocks generated by TanStack Start for SSR dehydration contain unnecessary blank lines and whitespace. Since this output is machine-generated serialization (Seroval streams, router state, etc.) and not user content, it could be minified without any risk of breaking functionality.

Your Example Website or App

https://github.com/canmi21/taki

Steps to Reproduce the Bug or Issue

View the HTML source of any SSR-rendered TanStack Start page. The dehydrated <script> tags contain patterns like:

<script>($R=>{ ... })($R["tsr"]);    
 document.currentScript.remove()</script>

There are blank lines between statements and unnecessary newlines within the Seroval stream constructor output.

Expected behavior

Dehydrated script output should be compact, e.g：

 <script>($R=>{ ... })($R["tsr"]);document.currentScript.remove()</script>

Screenshots or Videos

Platform

• Router / Start Version: 1.166.11
• OS: any
• Browser: any
• Browser Version: any
• Bundler: vite
• Bundler Version: 8.0.0

Additional context

Why this matters

Slightly increases HTML payload size on every SSR response before compression Makes View Source unnecessarily noisy
This is framework-generated serialization, not user-authored content there is no "<pre.>" or whitespace-sensitive context to worry about, so it is safe to strip

Start by reproducing the issue in an SSR-rendered TanStack Start page and inspect the inline dehydrated <script> blocks in the HTML source. Trace the Seroval stream and router-state output responsible for the blank lines, then verify that the generated script is compact while SSR hydration still works.