Detect TanStack Start in CLI (#30779)

TanStack Start recently dropped Vite as a dependency, causing Convex not to know to use VITE_CONVEX_URL.

GitOrigin-RevId: ae515eeb56d6724a7af8e9f4fee5bc6df3718bc5

Author: thomasballinger

src/cli/lib/envvars.ts

@@ -14,6 +14,7 @@ const _FRAMEWORKS = [
   "Remix",
   "SvelteKit",
   "Expo",
+  "TanStackStart",
 ] as const;
 type Framework = (typeof _FRAMEWORKS)[number];
 
@@ -144,6 +145,16 @@ export async function suggestedEnvVarName(ctx: Context): Promise<{
     };
   }
 
+  // TanStackStart currently supports VITE_FOO for browser-side envvars.
+  const isTanStackStart = "@tanstack/start" in packages;
+
+  if (isTanStackStart) {
+    return {
+      detectedFramework: "TanStackStart",
+      envVar: "VITE_CONVEX_URL",
+    };
+  }
+
   return {
     envVar: "CONVEX_URL",
   };