HMR is injected into the code for non-production builds which totally breaks code coverage during tests.

It took me a long time to find that it can be disabled in vitest.config.ts using:

tanstackRouter({
  // Disable HMR injection in test builds. The code-splitter plugin injects
  // import.meta.hot accept blocks into route files for dev-time hot reloading.
  // These create untestable branches that inflate coverage gaps.
  codeSplittingOptions: { addHmr: false },
}),

I don't suppose there is any way to automatically disable this during tests? At the very least could this be added to the documentation?