fix: support optional call expression

src/core/identifiers.ts

@@ -67,13 +67,10 @@ export function getIdentifierUsages(node?: Expression | TSType | SpreadElement |
   else if (node.type === 'Identifier') {
     identifiers.add(node.name)
   }
-  else if (node.type === 'MemberExpression') {
+  else if (node.type === 'MemberExpression' || node.type === 'OptionalMemberExpression') {
     getIdentifierUsages(node.object, identifiers)
   }
-  else if (node.type === 'OptionalMemberExpression') {
-    getIdentifierUsages(node.object, identifiers)
-  }
-  else if (node.type === 'CallExpression') {
+  else if (node.type === 'CallExpression' || node.type === 'OptionalCallExpression') {
     getIdentifierUsages(node.callee as Expression, identifiers)
     node.arguments.forEach(arg => getIdentifierUsages(arg as Expression, identifiers))
   }

test/__snapshots__/transform.test.ts.snap

@@ -702,6 +702,35 @@ export default __sfc_main;
 "
 `;
 
+exports[`transform fixtures test/fixtures/TemplateOptionalChaining.vue 1`] = `
+"<template>
+  <div @click=\\"callback?.()\\">
+    {{ text?.length ?? textLengthDefault }}
+    {{ classes?.[0] }}
+  </div>
+</template>
+
+<script lang=\\"ts\\">
+const __sfc_main = {};
+
+__sfc_main.setup = (__props, __ctx) => {
+  const text = 'hello';
+  const textLengthDefault = 0;
+  const callback = (undefined as undefined | (() => void));
+  const classes = (undefined as undefined | string[]);
+  return {
+    text,
+    textLengthDefault,
+    callback,
+    classes
+  };
+};
+
+export default __sfc_main;
+</script>
+"
+`;
+
 exports[`transform fixtures test/fixtures/VFor.vue 1`] = `
 "<template>
   <div>

test/fixtures/TemplateOptionalChaining.vue

@@ -0,0 +1,14 @@
+<template>
+  <div @click="callback?.()">
+    {{ text?.length ?? textLengthDefault }}
+    {{ classes?.[0] }}
+  </div>
+</template>
+
+<script setup lang="ts">
+const text = 'hello'
+const textLengthDefault = 0
+
+const callback = undefined as undefined | (() => void)
+const classes = undefined as undefined | string[]
+</script>