diff --git a/packages/router-devtools-core/package.json b/packages/router-devtools-core/package.json
index e5c7eb03129..75c7995ec53 100644
--- a/packages/router-devtools-core/package.json
+++ b/packages/router-devtools-core/package.json
@@ -34,7 +34,7 @@
     "test:types:ts59": "node ../../node_modules/typescript59/lib/tsc.js",
     "test:types:ts60": "tsc",
     "test:build": "publint --strict && attw --ignore-rules no-resolution --pack .",
-    "build": "vite build"
+    "build": "vite build && BUILD_SSR=true vite build"
   },
   "type": "module",
   "types": "./dist/esm/index.d.ts",
@@ -44,6 +44,9 @@
     ".": {
       "import": {
         "types": "./dist/esm/index.d.ts",
+        "worker": "./dist/esm/index.js",
+        "browser": "./dist/esm/index.js",
+        "node": "./dist/esm/index.server.js",
         "default": "./dist/esm/index.js"
       },
       "require": {
diff --git a/packages/router-devtools-core/vite.config.ts b/packages/router-devtools-core/vite.config.ts
index 53da7f8839f..29098837e66 100644
--- a/packages/router-devtools-core/vite.config.ts
+++ b/packages/router-devtools-core/vite.config.ts
@@ -2,8 +2,26 @@ import { defineConfig, mergeConfig } from 'vitest/config'
 import { tanstackViteConfig } from '@tanstack/vite-config'
 import solid from 'vite-plugin-solid'
 
+// Produce two builds:
+//  - default (client/DOM): `dist/esm/index.js` + `dist/cjs/index.cjs`
+//  - SSR (BUILD_SSR=true):  `dist/esm/index.server.js`
+//
+// vite-plugin-solid's default DOM JSX transform emits module-scope
+// `delegateEvents([...])` and `template(...)` calls that touch `window` /
+// throw "client-only API" when the bundled Solid runtime is its DOM build.
+// See https://github.com/TanStack/router/issues/7205.
+//
+// Neither just externalizing `solid-js/web` nor just swapping conditions is
+// enough: Solid's SSR build exports those functions as stubs that throw on
+// call, and consumer bundlers (e.g. nitro) eagerly concatenate the lazy
+// chunks into the server entry, so the module-scope calls fire at import.
+// Shipping a second bundle compiled with `ssr: true` makes vite-plugin-solid
+// emit `ssr()` / `ssrElement()` calls instead, which are real SSR primitives.
+// The `node` export condition in package.json picks this build automatically.
+const ssr = process.env.BUILD_SSR === 'true'
+
 const config = defineConfig({
-  plugins: [solid()],
+  plugins: [solid({ ssr })],
 })
 
 const merged = mergeConfig(
@@ -13,10 +31,35 @@ const merged = mergeConfig(
     entry: './src/index.tsx',
     srcDir: './src',
     bundledDeps: ['solid-js', 'solid-js/web'],
+    // Only emit CJS and declaration files for the client build — the SSR
+    // build only needs ESM, and the types are identical.
+    cjs: !ssr,
   }),
 )
 
 merged.build.rolldownOptions.output.manualChunks = undefined
 merged.build.rolldownOptions.output.preserveModules = false
 
+if (ssr) {
+  // Don't wipe the client build produced in the previous step.
+  merged.build.emptyOutDir = false
+  merged.build.lib.formats = ['es']
+  // Build in SSR mode so Vite resolves `solid-js/web` via the `node` export
+  // condition and pulls in Solid's server build.
+  merged.build.ssr = true
+  merged.ssr = {
+    // Still bundle Solid so the server artifact is self-contained.
+    noExternal: ['solid-js', 'solid-js/web'],
+  }
+  // `lib.fileName` isn't honored when `build.ssr` is set, so drive the
+  // output names via rolldown directly.
+  merged.build.rolldownOptions.output.entryFileNames = 'esm/index.server.js'
+  merged.build.rolldownOptions.output.chunkFileNames = 'esm/[name].js'
+  // Skip declaration-file generation — the client build already produced
+  // `.d.ts`/`.d.cts` files that are valid for both.
+  merged.plugins = merged.plugins.filter(
+    (p: any) => !p || p.name !== 'vite:dts',
+  )
+}
+
 export default merged