feat: slot type for defineComponent

packages/compiler-sfc/__tests__/__snapshots__/compileScript.spec.ts.snap

@@ -1769,6 +1769,51 @@ return { props, emit }
 })"
 `;
 
+exports[`SFC compile <script setup> > with TypeScript > defineSlots 1`] = `
+"import { useSlots as _useSlots, defineComponent as _defineComponent } from 'vue'
+
+export default /*#__PURE__*/_defineComponent({
+  setup(__props, { expose: __expose }) {
+  __expose();
+
+      const slots = _useSlots()
+
+return { slots }
+}
+
+})"
+`;
+
+exports[`SFC compile <script setup> > with TypeScript > defineSlots w/o generic params 1`] = `
+"import { useSlots as _useSlots } from 'vue'
+
+export default {
+  setup(__props, { expose: __expose }) {
+  __expose();
+
+      const slots = _useSlots()
+
+return { slots }
+}
+
+}"
+`;
+
+exports[`SFC compile <script setup> > with TypeScript > defineSlots w/o return value 1`] = `
+"import { defineComponent as _defineComponent } from 'vue'
+
+export default /*#__PURE__*/_defineComponent({
+  setup(__props, { expose: __expose }) {
+  __expose();
+
+
+
+return {  }
+}
+
+})"
+`;
+
 exports[`SFC compile <script setup> > with TypeScript > hoist type declarations 1`] = `
 "import { defineComponent as _defineComponent } from 'vue'
 export interface Foo {}

packages/compiler-sfc/__tests__/compileScript.spec.ts

@@ -1540,6 +1540,40 @@ const emit = defineEmits(['a', 'b'])
       expect(content).toMatch(`emits: ['foo']`)
     })
 
+    test('defineSlots', () => {
+      const { content } = compile(`
+      <script setup lang="ts">
+      const slots = defineSlots<{
+        default: [msg: string]
+      }>()
+      </script>
+      `)
+      assertCode(content)
+      expect(content).toMatch(`const slots = _useSlots()`)
+    })
+
+    test('defineSlots w/o return value', () => {
+      const { content } = compile(`
+      <script setup lang="ts">
+      defineSlots<{
+        default: [msg: string]
+      }>()
+      </script>
+      `)
+      assertCode(content)
+      expect(content).not.toMatch(`_useSlots`)
+    })
+
+    test('defineSlots w/o generic params', () => {
+      const { content } = compile(`
+      <script setup>
+      const slots = defineSlots()
+      </script>
+      `)
+      assertCode(content)
+      expect(content).toMatch(`const slots = _useSlots()`)
+    })
+
     test('runtime Enum', () => {
       const { content, bindings } = compile(
         `<script setup lang="ts">

packages/compiler-sfc/src/compileScript.ts

@@ -618,7 +618,7 @@ export function compileScript(
     }
     hasDefineSlotsCall = true
 
-    if (node.arguments) {
+    if (node.arguments.length > 0) {
       error(`${DEFINE_SLOTS}() cannot accept arguments`, node)
     }
 

packages/dts-test/defineComponent.test-d.tsx

@@ -8,7 +8,10 @@ import {
   ComponentPublicInstance,
   ComponentOptions,
   SetupContext,
-  h
+  h,
+  SlotsType,
+  useSlots,
+  Slots
 } from 'vue'
 import { describe, expectType, IsUnion } from './utils'
 
@@ -1406,6 +1409,32 @@ export default {
   })
 }
 
+describe('slots', () => {
+  defineComponent({
+    slots: Object as SlotsType<{
+      default: [foo: string, bar: number]
+      item: [number]
+    }>,
+    setup(props, { slots }) {
+      expectType<(foo: string, bar: number) => any>(slots.default)
+      expectType<(scope: number) => any>(slots.item)
+    }
+  })
+
+  defineComponent({
+    // @ts-expect-error `default` should be an array
+    slots: Object as SlotsType<{ default: string }>
+  })
+
+  defineComponent({
+    setup(props, { slots }) {
+      // unknown slots
+      expectType<Slots>(slots)
+      expectType<((...args: any[]) => any) | undefined>(slots.default)
+    }
+  })
+})
+
 import {
   DefineComponent,
   ComponentOptionsMixin,
@@ -1428,6 +1457,7 @@ declare const MyButton: DefineComponent<
   ComponentOptionsMixin,
   EmitsOptions,
   string,
+  {},
   VNodeProps & AllowedComponentProps & ComponentCustomProps,
   Readonly<ExtractPropTypes<{}>>,
   {}

packages/dts-test/setupHelpers.test-d.ts

@@ -4,7 +4,9 @@ import {
   useAttrs,
   useSlots,
   withDefaults,
-  Slots
+  Slots,
+  defineSlots,
+  VNode
 } from 'vue'
 import { describe, expectType } from './utils'
 
@@ -160,6 +162,19 @@ describe('defineEmits w/ runtime declaration', () => {
   emit2('baz')
 })
 
+describe('defineSlots', () => {
+  const slots = defineSlots<{
+    default: [foo: string, bar: number]
+  }>()
+  expectType<(foo: string, bar: number) => VNode[]>(slots.default)
+
+  const slotsUntype = defineSlots()
+  expectType<Slots>(slotsUntype)
+
+  // @ts-expect-error `default` should be an array
+  defineSlots<{ default: string }>()
+})
+
 describe('useAttrs', () => {
   const attrs = useAttrs()
   expectType<Record<string, unknown>>(attrs)

packages/runtime-core/src/apiDefineComponent.ts

@@ -28,6 +28,7 @@ import {
   CreateComponentPublicInstance,
   ComponentPublicInstanceConstructor
 } from './componentPublicInstance'
+import { SlotsType } from './componentSlots'
 
 export type PublicProps = VNodeProps &
   AllowedComponentProps &
@@ -43,6 +44,7 @@ export type DefineComponent<
   Extends extends ComponentOptionsMixin = ComponentOptionsMixin,
   E extends EmitsOptions = {},
   EE extends string = string,
+  S extends SlotsType = {},
   PP = PublicProps,
   Props = Readonly<
     PropsOrPropOptions extends ComponentPropsOptions
@@ -61,6 +63,7 @@ export type DefineComponent<
     Mixin,
     Extends,
     E,
+    S,
     PP & Props,
     Defaults,
     true
@@ -77,6 +80,7 @@ export type DefineComponent<
     Extends,
     E,
     EE,
+    S,
     Defaults
   > &
   PP
@@ -91,29 +95,33 @@ export type DefineComponent<
 export function defineComponent<
   Props extends Record<string, any>,
   E extends EmitsOptions = {},
-  EE extends string = string
+  EE extends string = string,
+  S extends SlotsType = {}
 >(
   setup: (
     props: Props,
-    ctx: SetupContext<E>
+    ctx: SetupContext<E, S>
   ) => RenderFunction | Promise<RenderFunction>,
   options?: Pick<ComponentOptions, 'name' | 'inheritAttrs'> & {
     props?: (keyof Props)[]
     emits?: E | EE[]
+    slots?: S
   }
 ): (props: Props & EmitsToProps<E>) => any
 export function defineComponent<
   Props extends Record<string, any>,
   E extends EmitsOptions = {},
-  EE extends string = string
+  EE extends string = string,
+  S extends SlotsType = {}
 >(
   setup: (
     props: Props,
-    ctx: SetupContext<E>
+    ctx: SetupContext<E, S>
   ) => RenderFunction | Promise<RenderFunction>,
   options?: Pick<ComponentOptions, 'name' | 'inheritAttrs'> & {
     props?: ComponentObjectPropsOptions<Props>
     emits?: E | EE[]
+    slots?: S
   }
 ): (props: Props & EmitsToProps<E>) => any
 
@@ -130,6 +138,7 @@ export function defineComponent<
   Extends extends ComponentOptionsMixin = ComponentOptionsMixin,
   E extends EmitsOptions = {},
   EE extends string = string,
+  S extends SlotsType = {},
   I extends ComponentInjectOptions = {},
   II extends string = string
 >(
@@ -143,10 +152,11 @@ export function defineComponent<
     Extends,
     E,
     EE,
+    S,
     I,
     II
   >
-): DefineComponent<Props, RawBindings, D, C, M, Mixin, Extends, E, EE>
+): DefineComponent<Props, RawBindings, D, C, M, Mixin, Extends, E, EE, S>
 
 // overload 3: object format with array props declaration
 // props inferred as { [key in PropNames]?: any }
@@ -161,6 +171,7 @@ export function defineComponent<
   Extends extends ComponentOptionsMixin = ComponentOptionsMixin,
   E extends EmitsOptions = {},
   EE extends string = string,
+  S extends SlotsType = {},
   I extends ComponentInjectOptions = {},
   II extends string = string
 >(
@@ -174,6 +185,7 @@ export function defineComponent<
     Extends,
     E,
     EE,
+    S,
     I,
     II
   >
@@ -186,7 +198,8 @@ export function defineComponent<
   Mixin,
   Extends,
   E,
-  EE
+  EE,
+  S
 >
 
 // overload 4: object format with object props declaration
@@ -203,6 +216,7 @@ export function defineComponent<
   Extends extends ComponentOptionsMixin = ComponentOptionsMixin,
   E extends EmitsOptions = {},
   EE extends string = string,
+  S extends SlotsType = {},
   I extends ComponentInjectOptions = {},
   II extends string = string
 >(
@@ -216,10 +230,11 @@ export function defineComponent<
     Extends,
     E,
     EE,
+    S,
     I,
     II
   >
-): DefineComponent<PropsOptions, RawBindings, D, C, M, Mixin, Extends, E, EE>
+): DefineComponent<PropsOptions, RawBindings, D, C, M, Mixin, Extends, E, EE, S>
 
 // implementation, close to no-op
 export function defineComponent(

packages/runtime-core/src/apiSetupHelpers.ts

@@ -19,7 +19,7 @@ import {
   ExtractPropTypes
 } from './componentProps'
 import { warn } from './warning'
-import { VNode } from './vnode'
+import { Slot } from './componentSlots'
 
 // dev only
 const warnRuntimeUsage = (method: string) =>
@@ -178,11 +178,11 @@ export function defineOptions<
 }
 
 export function defineSlots<
-  T extends Record<string, any>
+  T extends Record<string, any[]> = Record<string, any[]>
 >(): // @ts-expect-error
-{
-  [K in keyof T]: (scope: T[K]) => VNode[] | undefined
-} {
+Readonly<{
+  [K in keyof T]: Slot<T[K]>
+}> {
   if (__DEV__) {
     warnRuntimeUsage(`defineSlots`)
   }

packages/runtime-core/src/component.ts

@@ -27,7 +27,13 @@ import {
   initProps,
   normalizePropsOptions
 } from './componentProps'
-import { Slots, initSlots, InternalSlots } from './componentSlots'
+import {
+  Slots,
+  initSlots,
+  InternalSlots,
+  SlotsType,
+  TypedSlots
+} from './componentSlots'
 import { warn } from './warning'
 import { ErrorCodes, callWithErrorHandling, handleError } from './errorHandling'
 import { AppContext, createAppContext, AppConfig } from './apiCreateApp'
@@ -117,10 +123,13 @@ export interface ComponentInternalOptions {
   __name?: string
 }
 
-export interface FunctionalComponent<P = {}, E extends EmitsOptions = {}>
-  extends ComponentInternalOptions {
+export interface FunctionalComponent<
+  P = {},
+  E extends EmitsOptions = {},
+  S extends SlotsType = {}
+> extends ComponentInternalOptions {
   // use of any here is intentional so it can be a valid JSX Element constructor
-  (props: P, ctx: Omit<SetupContext<E>, 'expose'>): any
+  (props: P, ctx: Omit<SetupContext<E, S>, 'expose'>): any
   props?: ComponentPropsOptions<P>
   emits?: E | (keyof E)[]
   inheritAttrs?: boolean
@@ -168,10 +177,13 @@ export type { ComponentOptions }
 type LifecycleHook<TFn = Function> = TFn[] | null
 
 // use `E extends any` to force evaluating type to fix #2362
-export type SetupContext<E = EmitsOptions> = E extends any
+export type SetupContext<
+  E = EmitsOptions,
+  S extends SlotsType = {}
+> = E extends any
   ? {
       attrs: Data
-      slots: Slots
+      slots: [keyof S] extends [never] ? Slots : TypedSlots<S>
       emit: EmitFn<E>
       expose: (exposed?: Record<string, any>) => void
     }