fix(rsc): fix cjs module runner default import

Author: hi-ogawa

packages/plugin-rsc/src/plugins/cjs.ts

@@ -56,7 +56,10 @@ export function cjsModuleRunnerPlugin(): Plugin[] {
           // TODO: can we use cjs-module-lexer to properly define named exports?
           // for re-exports, we need to eagerly transform dependencies though.
           // https://github.com/nodejs/node/blob/f3adc11e37b8bfaaa026ea85c1cf22e3a0e29ae9/lib/internal/modules/esm/translators.js#L382-L409
-          output.append(`__vite_ssr_exportAll__(module.exports)`)
+          output.append(`
+;__vite_ssr_exportAll__(module.exports);
+export default module.exports;
+`)
           return {
             code: output.toString(),
             map: output.generateMap({ hires: 'boundary' }),