feat(types): support inferring attrs

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

@@ -0,0 +1,46 @@
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`defineAttrs() > basic usage 1`] = `
+"import { useAttrs as _useAttrs, defineComponent as _defineComponent } from 'vue'
+
+export default /*#__PURE__*/_defineComponent({
+  setup(__props, { expose: __expose }) {
+  __expose();
+
+      const attrs = _useAttrs()
+
+return { attrs }
+}
+
+})"
+`;
+
+exports[`defineAttrs() > w/o generic params 1`] = `
+"import { useAttrs as _useAttrs } from 'vue'
+
+export default {
+  setup(__props, { expose: __expose }) {
+  __expose();
+
+      const attrs = _useAttrs()
+
+return { attrs }
+}
+
+}"
+`;
+
+exports[`defineAttrs() > w/o return value 1`] = `
+"import { defineComponent as _defineComponent } from 'vue'
+
+export default /*#__PURE__*/_defineComponent({
+  setup(__props, { expose: __expose }) {
+  __expose();
+
+
+
+return {  }
+}
+
+})"
+`;

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

@@ -0,0 +1,40 @@
+import { compileSFCScript as compile, assertCode } from '../utils'
+
+describe('defineAttrs()', () => {
+  test('basic usage', () => {
+    const { content } = compile(`
+      <script setup lang="ts">
+      const attrs = defineAttrs<{
+        bar?: number
+      }>()
+      </script>
+    `)
+    assertCode(content)
+    expect(content).toMatch(`const attrs = _useAttrs()`)
+    expect(content).not.toMatch('defineAttrs')
+  })
+
+  test('w/o return value', () => {
+    const { content } = compile(`
+      <script setup lang="ts">
+      defineAttrs<{
+        bar?: number
+      }>()
+      </script>
+    `)
+    assertCode(content)
+    expect(content).not.toMatch('defineAttrs')
+    expect(content).not.toMatch(`_useAttrs`)
+  })
+
+  test('w/o generic params', () => {
+    const { content } = compile(`
+      <script setup>
+      const attrs = defineAttrs()
+      </script>
+    `)
+    assertCode(content)
+    expect(content).toMatch(`const attrs = _useAttrs()`)
+    expect(content).not.toMatch('defineAttrs')
+  })
+})

packages/compiler-sfc/src/compileScript.ts

@@ -53,6 +53,7 @@ import {
 import { analyzeScriptBindings } from './script/analyzeScriptBindings'
 import { isImportUsed } from './script/importUsageCheck'
 import { processAwait } from './script/topLevelAwait'
+import { processDefineAttrs } from './script/defineAttrs'
 
 export interface SFCScriptCompileOptions {
   /**
@@ -512,7 +513,8 @@ export function compileScript(
         processDefineProps(ctx, expr) ||
         processDefineEmits(ctx, expr) ||
         processDefineOptions(ctx, expr) ||
-        processDefineSlots(ctx, expr)
+        processDefineSlots(ctx, expr) ||
+        processDefineAttrs(ctx, expr)
       ) {
         ctx.s.remove(node.start! + startOffset, node.end! + startOffset)
       } else if (processDefineExpose(ctx, expr)) {
@@ -550,7 +552,8 @@ export function compileScript(
             !isDefineProps && processDefineEmits(ctx, init, decl.id)
           !isDefineEmits &&
             (processDefineSlots(ctx, init, decl.id) ||
-              processDefineModel(ctx, init, decl.id))
+              processDefineModel(ctx, init, decl.id) ||
+              processDefineAttrs(ctx, init, decl.id))
 
           if (
             isDefineProps &&

packages/compiler-sfc/src/script/context.ts

@@ -36,6 +36,7 @@ export class ScriptCompileContext {
   hasDefineOptionsCall = false
   hasDefineSlotsCall = false
   hasDefineModelCall = false
+  hasDefineAttrsCall = false
 
   // defineProps
   propsCall: CallExpression | undefined

packages/compiler-sfc/src/script/defineAttrs.ts

@@ -0,0 +1,33 @@
+import { LVal, Node } from '@babel/types'
+import { isCallOf } from './utils'
+import { ScriptCompileContext } from './context'
+
+export const DEFINE_ATTRS = 'defineAttrs'
+
+export function processDefineAttrs(
+  ctx: ScriptCompileContext,
+  node: Node,
+  declId?: LVal
+): boolean {
+  if (!isCallOf(node, DEFINE_ATTRS)) {
+    return false
+  }
+  if (ctx.hasDefineAttrsCall) {
+    ctx.error(`duplicate ${DEFINE_ATTRS}() call`, node)
+  }
+  ctx.hasDefineAttrsCall = true
+
+  if (node.arguments.length > 0) {
+    ctx.error(`${DEFINE_ATTRS}() cannot accept arguments`, node)
+  }
+
+  if (declId) {
+    ctx.s.overwrite(
+      ctx.startOffset! + node.start!,
+      ctx.startOffset! + node.end!,
+      `${ctx.helper('useAttrs')}()`
+    )
+  }
+
+  return true
+}