fix(compiler-core): allow multiline expression on v-model and v-on (#1234)

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

@@ -21,6 +21,7 @@ export const transformModel: DirectiveTransform = (dir, node, context) => {
 
   const expString =
     exp.type === NodeTypes.SIMPLE_EXPRESSION ? exp.content : exp.loc.source
+
   if (!isMemberExpression(expString)) {
     context.onError(
       createCompilerError(ErrorCodes.X_V_MODEL_MALFORMED_EXPRESSION, exp.loc)

packages/compiler-core/src/utils.ts

@@ -84,8 +84,10 @@ export const isSimpleIdentifier = (name: string): boolean =>
   !nonIdentifierRE.test(name)
 
 const memberExpRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\[[^\]]+\])*$/
-export const isMemberExpression = (path: string): boolean =>
-  memberExpRE.test(path)
+export const isMemberExpression = (path: string): boolean => {
+  if (!path) return false
+  return memberExpRE.test(path.trim())
+}
 
 export function getInnerRange(
   loc: SourceLocation,