From: Evan You <yyx990803@gmail.com>
Date: Sun, 3 Nov 2019 01:33:37 +0000 (-0400)
Subject: feat: warn ref usage on functional components
X-Git-Tag: v3.0.0-alpha.0~254
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=7f054782ad0dde832e22e5cc1fb1186c1340d020;p=thirdparty%2Fvuejs%2Fcore.git

feat: warn ref usage on functional components
---

diff --git a/packages/runtime-core/src/renderer.ts b/packages/runtime-core/src/renderer.ts
index 8f67ce6b4f..3416cccd0e 100644
--- a/packages/runtime-core/src/renderer.ts
+++ b/packages/runtime-core/src/renderer.ts
@@ -804,6 +804,14 @@ export function createRenderer<
       }
     }
     if (n2.ref !== null && parentComponent !== null) {
+      if (__DEV__ && !(n2.shapeFlag & ShapeFlags.STATEFUL_COMPONENT)) {
+        pushWarningContext(n2)
+        warn(
+          `Functional components do not support "ref" because they do not ` +
+            `have instances.`
+        )
+        popWarningContext()
+      }
       setRef(n2.ref, n1 && n1.ref, parentComponent, n2.component!.renderProxy)
     }
   }