feat(plugin-vue): define __VUE_SSR__ flag

yyx990803 · yyx990803 · commit 6e1b7cb5b957 · 2021-09-23T12:40:30.000-04:00
diff --git a/packages/plugin-vue/src/index.ts b/packages/plugin-vue/src/index.ts
@@ -119,6 +119,7 @@ export default function vuePlugin(rawOptions: Options = {}): Plugin {
         define: {
           __VUE_OPTIONS_API__: true,
           __VUE_PROD_DEVTOOLS__: false,
+          __VUE_SSR__: !!config.build?.ssr,
           ...config.define
         },
         ssr: {
