fix(compiler-core):Make sure update:modelValue and update:model-value behave the same on slot

packages/compiler-core/__tests__/transforms/vOn.spec.ts

@@ -68,6 +68,43 @@ describe('compiler: transform v-on', () => {
     })
   })
 
+  // # fix: #6900 Ensure consistent behavior of @update:modelValue and @update:model-value
+  test('consistent behavior of @update:modelValue and @update:model-value', () => {
+    const { node } = parseWithVOn(`<div v-on:update:modelValue="handler"/>`)
+    const { node: nodeV } = parseWithVOn(
+      `<div v-on:update:model-value="handler"/>`
+    )
+    expect((node.codegenNode as VNodeCall).props).toMatchObject({
+      properties: [
+        {
+          key: {
+            type: NodeTypes.SIMPLE_EXPRESSION,
+            content: 'onUpdate:modelValue'
+          },
+          value: {
+            type: NodeTypes.SIMPLE_EXPRESSION,
+            content: `handler`,
+            isStatic: false
+          }
+        }
+      ]
+    })
+    expect((nodeV.codegenNode as VNodeCall).props).toMatchObject({
+      properties: [
+        {
+          key: {
+            type: NodeTypes.SIMPLE_EXPRESSION,
+            content: 'onUpdate:modelValue'
+          },
+          value: {
+            type: NodeTypes.SIMPLE_EXPRESSION,
+            content: `handler`,
+            isStatic: false
+          }
+        }
+      ]
+    })
+  })
   test('dynamic arg', () => {
     const { node } = parseWithVOn(`<div v-on:[event]="handler"/>`)
     expect((node.codegenNode as VNodeCall).props).toMatchObject({

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

@@ -50,7 +50,10 @@ export const transformOn: DirectiveTransform = (
       const eventString =
         node.tagType === ElementTypes.COMPONENT ||
         rawName.startsWith('vnode') ||
-        !/[A-Z]/.test(rawName)
+        (!/[A-Z]/.test(rawName) ||
+          // See issue #6900,Ensure consistent behavior of
+          // @update:modelValue and @update:model-value
+        rawName === 'update:modelValue')
           ? // for component and vnode lifecycle event listeners, auto convert
             // it to camelCase. See issue #2249
             toHandlerKey(camelize(rawName))
@@ -162,7 +165,6 @@ export const transformOn: DirectiveTransform = (
       )
     ]
   }
-
   // apply extended compiler augmentor
   if (augmentor) {
     ret = augmentor(ret)