feat: add defineSlots macro

Author: sxzz

packages/compiler-sfc/src/compileScript.ts

@@ -68,6 +68,7 @@ const DEFINE_EMITS = 'defineEmits'
 const DEFINE_EXPOSE = 'defineExpose'
 const WITH_DEFAULTS = 'withDefaults'
 const DEFINE_OPTIONS = 'defineOptions'
+const DEFINT_SLOTS = 'defineSlots'
 
 // constants
 const DEFAULT_VAR = `__default__`
@@ -299,6 +300,7 @@ export function compileScript(
   let hasDefaultExportName = false
   let hasDefaultExportRender = false
   let hasDefineOptionsCall = false
+  let hasDefineSlotsCall = false
   let propsRuntimeDecl: Node | undefined
   let propsRuntimeDefaults: ObjectExpression | undefined
   let propsDestructureDecl: Node | undefined
@@ -593,6 +595,26 @@ export function compileScript(
     return true
   }
 
+  function processDefineSlots(node: Node, declId?: LVal): boolean {
+    if (!isCallOf(node, DEFINT_SLOTS)) {
+      return false
+    }
+    if (hasDefineSlotsCall) {
+      error(`duplicate ${DEFINT_SLOTS}() call`, node)
+    }
+    hasDefineSlotsCall = true
+
+    if (declId) {
+      s.overwrite(
+        startOffset + node.start!,
+        startOffset + node.end!,
+        `${helper('useSlots')}()`
+      )
+    }
+
+    return true
+  }
+
   function getAstBody(): Statement[] {
     return scriptAst
       ? [...scriptSetupAst.body, ...scriptAst.body]
@@ -1288,7 +1310,8 @@ export function compileScript(
         processDefineProps(expr) ||
         processDefineEmits(expr) ||
         processDefineOptions(expr) ||
-        processWithDefaults(expr)
+        processWithDefaults(expr) ||
+        processDefineSlots(expr)
       ) {
         s.remove(node.start! + startOffset, node.end! + startOffset)
       } else if (processDefineExpose(expr)) {
@@ -1323,6 +1346,8 @@ export function compileScript(
             processDefineProps(init, decl.id) ||
             processWithDefaults(init, decl.id, node.kind)
           const isDefineEmits = processDefineEmits(init, decl.id)
+          processDefineSlots(init, decl.id)
+
           if (isDefineProps || isDefineEmits) {
             if (left === 1) {
               s.remove(node.start! + startOffset, node.end! + startOffset)

packages/runtime-core/src/apiSetupHelpers.ts

@@ -19,6 +19,7 @@ import {
   ExtractPropTypes
 } from './componentProps'
 import { warn } from './warning'
+import { VNode } from './vnode'
 
 // dev only
 const warnRuntimeUsage = (method: string) =>
@@ -176,6 +177,17 @@ export function defineOptions<
   }
 }
 
+export function defineSlots<
+  T extends Record<string, any>
+>(): // @ts-expect-error
+{
+  [K in keyof T]: (scope: T[K]) => VNode[] | undefined
+} {
+  if (__DEV__) {
+    warnRuntimeUsage(`defineSlots`)
+  }
+}
+
 type NotUndefined<T> = T extends undefined ? never : T
 
 type InferDefaults<T> = {

packages/runtime-core/types/scriptSetupHelpers.d.ts

@@ -4,12 +4,14 @@ type _defineProps = typeof defineProps
 type _defineEmits = typeof defineEmits
 type _defineExpose = typeof defineExpose
 type _defineOptions = typeof defineOptions
+type _defineSlots = typeof defineSlots
 type _withDefaults = typeof withDefaults
 
 declare global {
   const defineProps: _defineProps
   const defineEmits: _defineEmits
   const defineExpose: _defineExpose
   const defineOptions: _defineOptions
+  const defineSlots: _defineSlots
   const withDefaults: _withDefaults
 }