From: Evan You <yyx990803@gmail.com>
Date: Sun, 18 Apr 2021 03:51:40 +0000 (-0400)
Subject: wip: warn against `<template functional>`
X-Git-Tag: v3.1.0-beta.1~59^2~22
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=467076361a730b7925c88c572793c78637e05ca7;p=thirdparty%2Fvuejs%2Fcore.git

wip: warn against `<template functional>`
---

diff --git a/packages/compiler-sfc/src/parse.ts b/packages/compiler-sfc/src/parse.ts
index df7059c1f6..dabd227fa0 100644
--- a/packages/compiler-sfc/src/parse.ts
+++ b/packages/compiler-sfc/src/parse.ts
@@ -155,6 +155,18 @@ export function parse(
             false
           ) as SFCTemplateBlock)
           templateBlock.ast = node
+
+          // warn against 2.x <template functional>
+          if (templateBlock.attrs.functional) {
+            const err = new SyntaxError(
+              `<template functional> is no longer supported in Vue 3, since ` +
+                `functional components no longer have significant performance ` +
+                `difference from stateful ones. Just use a normal <template> ` +
+                `instead.`
+            ) as CompilerError
+            err.loc = node.props.find(p => p.name === 'functional')!.loc
+            errors.push(err)
+          }
         } else {
           errors.push(createDuplicateBlockError(node))
         }