types: add type tests for nextTick

packages-private/dts-test/scheduler.test-d.ts

@@ -0,0 +1,31 @@
+import { nextTick } from 'vue'
+import { describe, expectType } from './utils'
+
+describe('nextTick', async () => {
+  expectType<Promise<void>>(nextTick())
+  expectType<Promise<string>>(nextTick(() => 'foo'))
+  expectType<Promise<string>>(nextTick(() => Promise.resolve('foo')))
+  expectType<Promise<string>>(
+    nextTick(() => Promise.resolve(Promise.resolve('foo'))),
+  )
+
+  expectType<void>(await nextTick())
+  expectType<string>(await nextTick(() => 'foo'))
+  expectType<string>(await nextTick(() => Promise.resolve('foo')))
+  expectType<string>(
+    await nextTick(() => Promise.resolve(Promise.resolve('foo'))),
+  )
+
+  nextTick().then(value => {
+    expectType<void>(value)
+  })
+  nextTick(() => 'foo').then(value => {
+    expectType<string>(value)
+  })
+  nextTick(() => Promise.resolve('foo')).then(value => {
+    expectType<string>(value)
+  })
+  nextTick(() => Promise.resolve(Promise.resolve('foo'))).then(value => {
+    expectType<string>(value)
+  })
+})