wip: new cssVars SSR integration + fix cssVars SSR injection for suspense

packages/compiler-sfc/src/warn.ts

@@ -0,0 +1,12 @@
+const hasWarned: Record<string, boolean> = {}
+
+export function warnOnce(msg: string) {
+  if (!hasWarned[msg]) {
+    hasWarned[msg] = true
+    warn(msg)
+  }
+}
+
+export function warn(msg: string) {
+  console.warn(`\x1b[33m[@vue/compiler-sfc] ${msg}\x1b[0m\n`)
+}