wip: v-bind.sync compat

packages/compiler-core/src/transforms/vBind.ts

@@ -3,11 +3,15 @@ import { createObjectProperty, createSimpleExpression, NodeTypes } from '../ast'
 import { createCompilerError, ErrorCodes } from '../errors'
 import { camelize } from '@vue/shared'
 import { CAMELIZE } from '../runtimeHelpers'
+import {
+  checkCompatEnabled,
+  CompilerDeprecationTypes
+} from '../compat/compatConfig'
 
 // v-bind without arg is handled directly in ./transformElements.ts due to it affecting
 // codegen for the entire props object. This transform here is only for v-bind
 // *with* args.
-export const transformBind: DirectiveTransform = (dir, node, context) => {
+export const transformBind: DirectiveTransform = (dir, _node, context) => {
   const { exp, modifiers, loc } = dir
   const arg = dir.arg!
 
@@ -33,6 +37,18 @@ export const transformBind: DirectiveTransform = (dir, node, context) => {
     }
   }
 
+  if (__COMPAT__) {
+    if (modifiers.includes('prop')) {
+      checkCompatEnabled(
+        CompilerDeprecationTypes.COMPILER_V_BIND_PROP,
+        context,
+        loc
+      )
+    }
+    // .sync handling is performed directly in the parse phase to transform
+    // it into v-model:arg equivalent.
+  }
+
   if (
     !exp ||
     (exp.type === NodeTypes.SIMPLE_EXPRESSION && !exp.content.trim())