feat(sfc): add defineEmits and deprecate defineEmit (#3725)

test-dts/setupHelpers.test-d.ts

@@ -2,6 +2,7 @@ import {
   expectType,
   defineProps,
   defineEmit,
+  defineEmits,
   useContext,
   Slots,
   describe
@@ -49,8 +50,8 @@ describe('defineProps w/ runtime declaration', () => {
   props2.baz
 })
 
-describe('defineEmit w/ type declaration', () => {
-  const emit = defineEmit<(e: 'change') => void>()
+describe('defineEmits w/ type declaration', () => {
+  const emit = defineEmits<(e: 'change') => void>()
   emit('change')
   // @ts-expect-error
   emit()
@@ -58,7 +59,7 @@ describe('defineEmit w/ type declaration', () => {
   emit('bar')
 
   type Emits = { (e: 'foo' | 'bar'): void; (e: 'baz', id: number): void }
-  const emit2 = defineEmit<Emits>()
+  const emit2 = defineEmits<Emits>()
 
   emit2('foo')
   emit2('bar')
@@ -67,8 +68,8 @@ describe('defineEmit w/ type declaration', () => {
   emit2('baz')
 })
 
-describe('defineEmit w/ runtime declaration', () => {
-  const emit = defineEmit({
+describe('defineEmits w/ runtime declaration', () => {
+  const emit = defineEmits({
     foo: () => {},
     bar: null
   })
@@ -77,13 +78,24 @@ describe('defineEmit w/ runtime declaration', () => {
   // @ts-expect-error
   emit('baz')
 
-  const emit2 = defineEmit(['foo', 'bar'])
+  const emit2 = defineEmits(['foo', 'bar'])
   emit2('foo')
   emit2('bar', 123)
   // @ts-expect-error
   emit2('baz')
 })
 
+describe('deprecated defineEmit', () => {
+  const emit = defineEmit({
+    foo: () => {},
+    bar: null
+  })
+  emit('foo')
+  emit('bar', 123)
+  // @ts-expect-error
+  emit('baz')
+})
+
 describe('useContext', () => {
   const { attrs, emit, slots } = useContext()
   expectType<Record<string, unknown>>(attrs)