diff --git a/apps/compliance-portal/vite.config.ts b/apps/compliance-portal/vite.config.ts
index eb0cb1897..1adc06e7f 100644
--- a/apps/compliance-portal/vite.config.ts
+++ b/apps/compliance-portal/vite.config.ts
@@ -23,13 +23,56 @@ import { fileURLToPath, URL } from "node:url";
import babel from "@rolldown/plugin-babel";
import tailwindcss from "@tailwindcss/vite";
import react from "@vitejs/plugin-react";
-import { defineConfig } from "vite";
+import { defineConfig, type Plugin } from "vite";
+
+// index.html is also a Go html/template for the production SPA shell. Vite's
+// dev server does not execute those actions, so bare {{if}}/{{range}} text is
+// moved into by the browser. Substitute safe defaults while serving.
+function goHtmlTemplateDevDefaults(): Plugin {
+ return {
+ name: "go-html-template-dev-defaults",
+ // Only register during `vite` / `vite serve` — production builds must keep
+ // the Go html/template actions for pkg/server/trust.
+ apply: "serve",
+ transformIndexHtml: {
+ order: "pre",
+ handler(html) {
+ return html
+ .replace(
+ /\{\{if \.HtmlLang\}\}\{\{\.HtmlLang\}\}\{\{else\}\}en\{\{end\}\}/g,
+ "en",
+ )
+ .replace(
+ /\{\{if \.FaviconURL\}\}\{\{\.FaviconURL\}\}\{\{else\}\}(\/favicons\/favicon\.ico)\{\{end\}\}/g,
+ "$1",
+ )
+ .replace(
+ /\{\{if \.CanonicalURL\}\}\{\{end\}\}\s*/g,
+ "",
+ )
+ .replace(
+ // eslint-disable-next-line @stylistic/max-len
+ /\{\{range \.Hreflang\}\}\s*\{\{end\}\}\s*/g,
+ "",
+ )
+ .replace(/\{\{\.Title\}\}/g, "Compliance")
+ .replace(/\{\{\.Description\}\}/g, "")
+ .replace(/\{\{\.OGURL\}\}/g, "");
+ },
+ },
+ };
+}
// https://vite.dev/config/
// @vitejs/plugin-react@6 (Vite 8) no longer runs Babel, so the Relay tagged
// template transform is applied via @rolldown/plugin-babel instead.
export default defineConfig({
- plugins: [react(), babel({ plugins: ["relay"] }), tailwindcss()],
+ plugins: [
+ goHtmlTemplateDevDefaults(),
+ react(),
+ babel({ plugins: ["relay"] }),
+ tailwindcss(),
+ ],
build: {
assetsDir: "assets",
rolldownOptions: {