fix(compiler-sfc): fix treeshaking of namespace import when used in template

fix #5209

Author: yyx990803

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

@@ -777,6 +777,7 @@ exports[`SFC compile <script setup> inlineTemplate mode avoid unref() when neces
 import { ref } from 'vue'
         import Foo, { bar } from './Foo.vue'
         import other from './util'
+        import * as tree from './tree'
 
 export default {
   setup(__props) {
@@ -795,7 +796,8 @@ return (_ctx, _cache) => {
       ]),
       _: 1 /* STABLE */
     }),
-    _createElementVNode(\\"div\\", { onClick: fn }, _toDisplayString(count.value) + \\" \\" + _toDisplayString(constant) + \\" \\" + _toDisplayString(_unref(maybe)) + \\" \\" + _toDisplayString(_unref(lett)) + \\" \\" + _toDisplayString(_unref(other)), 1 /* TEXT */)
+    _createElementVNode(\\"div\\", { onClick: fn }, _toDisplayString(count.value) + \\" \\" + _toDisplayString(constant) + \\" \\" + _toDisplayString(_unref(maybe)) + \\" \\" + _toDisplayString(_unref(lett)) + \\" \\" + _toDisplayString(_unref(other)), 1 /* TEXT */),
+    _createTextVNode(\\" \\" + _toDisplayString(tree.foo()), 1 /* TEXT */)
   ], 64 /* STABLE_FRAGMENT */))
 }
 }

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

@@ -519,6 +519,7 @@ defineExpose({ foo: 123 })
         import { ref } from 'vue'
         import Foo, { bar } from './Foo.vue'
         import other from './util'
+        import * as tree from './tree'
         const count = ref(0)
         const constant = {}
         const maybe = foo()
@@ -528,6 +529,7 @@ defineExpose({ foo: 123 })
         <template>
           <Foo>{{ bar }}</Foo>
           <div @click="fn">{{ count }} {{ constant }} {{ maybe }} {{ lett }} {{ other }}</div>
+          {{ tree.foo() }}
         </template>
         `,
         { inlineTemplate: true }
@@ -546,6 +548,8 @@ defineExpose({ foo: 123 })
       expect(content).toMatch(`unref(maybe)`)
       // should unref() on let bindings
       expect(content).toMatch(`unref(lett)`)
+      // no need to unref namespace import (this also preserves tree-shaking)
+      expect(content).toMatch(`tree.foo()`)
       // no need to unref function declarations
       expect(content).toMatch(`{ onClick: fn }`)
       // no need to mark constant fns in patch flag

packages/compiler-sfc/src/compileScript.ts

@@ -1011,10 +1011,13 @@ export function compileScript(
       for (let i = 0; i < node.specifiers.length; i++) {
         const specifier = node.specifiers[i]
         const local = specifier.local.name
-        const imported =
+        let imported =
           specifier.type === 'ImportSpecifier' &&
           specifier.imported.type === 'Identifier' &&
           specifier.imported.name
+        if (specifier.type === 'ImportNamespaceSpecifier') {
+          imported = '*'
+        }
         const source = node.source.value
         const existing = userImports[local]
         if (
@@ -1257,7 +1260,9 @@ export function compileScript(
   )) {
     if (isType) continue
     bindingMetadata[key] =
-      (imported === 'default' && source.endsWith('.vue')) || source === 'vue'
+      imported === '*' ||
+      (imported === 'default' && source.endsWith('.vue')) ||
+      source === 'vue'
         ? BindingTypes.SETUP_CONST
         : BindingTypes.SETUP_MAYBE_REF
   }