Fix swc compiling of client components when directive appears later t…

…han exports (#54392)

When `"use client"` directive appears after other statements, it should
be ignored instead of treat as client components. There's a bug inside
swc transform that we should mark the directives detection is "finished"
after other non string literals directives AST nodes are detected before
the first directive

x-ref:
#54358 (comment)

packages/next-swc/crates/core/src/react_server_components.rs

@@ -222,6 +222,7 @@ impl<C: Comments> ReactServerComponents<C> {
                             },
                         })
                     }
+                    finished_directives = true;
                 }
                 ModuleItem::ModuleDecl(ModuleDecl::ExportDecl(ExportDecl { decl, .. })) => {
                     match decl {
@@ -240,18 +241,21 @@ impl<C: Comments> ReactServerComponents<C> {
                         }
                         _ => {}
                     }
+                    finished_directives = true;
                 }
                 ModuleItem::ModuleDecl(ModuleDecl::ExportDefaultDecl(ExportDefaultDecl {
                     decl: _,
                     ..
                 })) => {
                     self.export_names.push("default".to_string());
+                    finished_directives = true;
                 }
                 ModuleItem::ModuleDecl(ModuleDecl::ExportDefaultExpr(ExportDefaultExpr {
                     expr: _,
                     ..
                 })) => {
                     self.export_names.push("default".to_string());
+                    finished_directives = true;
                 }
                 ModuleItem::ModuleDecl(ModuleDecl::ExportAll(_)) => {
                     self.export_names.push("*".to_string());

packages/next-swc/crates/core/tests/errors/react-server-components/server-graph/fake-client-entry/input.js

@@ -0,0 +1,6 @@
+export default function () {
+  return null
+}
+
+// prettier-ignore
+'use client'

packages/next-swc/crates/core/tests/errors/react-server-components/server-graph/fake-client-entry/output.js

@@ -0,0 +1,3 @@
+export default function() {
+    return null;
+}

packages/next-swc/crates/core/tests/errors/react-server-components/server-graph/fake-client-entry/output.stderr

@@ -0,0 +1,7 @@
+
+  x NEXT_RSC_ERR_CLIENT_DIRECTIVE
+   ,-[input.js:5:1]
+ 5 | // prettier-ignore
+ 6 | 'use client'
+   : ^^^^^^^^^^^^
+   `----