fix(compiler-vapor): check global allowed for identifier (#189)

Co-authored-by: 三咲智子 Kevin Deng <sxzz@sxzz.moe>

packages/compiler-vapor/src/generators/expression.ts

@@ -1,3 +1,4 @@
+import { isGloballyAllowed } from '@vue/shared'
 import {
   BindingTypes,
   NewlineType,
@@ -167,7 +168,7 @@ function genIdentifier(
         raw = withAssignment(raw)
     }
   } else {
-    raw = withAssignment(`_ctx.${raw}`)
+    raw = withAssignment(canPrefix(raw) ? `_ctx.${raw}` : raw)
   }
   return [prefix, [raw, NewlineType.None, loc, name]]
 
@@ -178,3 +179,15 @@ function genIdentifier(
     return `${vaporHelper('unref')}(${raw})`
   }
 }
+
+function canPrefix(name: string) {
+  // skip whitelisted globals
+  if (isGloballyAllowed(name)) {
+    return false
+  }
+  // special case for webpack compilation
+  if (name === 'require') {
+    return false
+  }
+  return true
+}