fix: Search index not generating in certain Next.js versions (#1914)

* fix search

* add changeset

* prettier

.changeset/gorgeous-walls-brush.md

@@ -0,0 +1,7 @@
+---
+'nextra': patch
+'nextra-theme-blog': patch
+'nextra-theme-docs': patch
+---
+
+Fix search not working in certain Next.js versions

packages/nextra/src/search/plugin.ts

@@ -16,8 +16,22 @@ export class NextraSearchPlugin {
 
           for (const [, entry] of compilation.entries.entries()) {
             const entryDependency = entry.dependencies?.[0]
-            const entryModule =
+
+            // There're some Next.js refactors that might cause the MDX module
+            // to be a dependency of the entry module, instead of the entry
+            // itself. This is a workaround to find the MDX module loaded by
+            // Nextra.
+            let entryModule =
               compilation.moduleGraph.getResolvedModule(entryDependency)
+            if (!entryModule?.buildInfo?.nextraSearch) {
+              for (const dependency of entryModule.dependencies) {
+                const mod =
+                  compilation.moduleGraph.getResolvedModule(dependency)
+                if (mod?.buildInfo?.nextraSearch) {
+                  entryModule = mod
+                }
+              }
+            }
 
             if (entryModule?.buildInfo?.nextraSearch) {
               const { title, data, indexKey, route } =