From 0dc521b9e15ce4aa3d5229e90d2173644529e92b Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Mon, 20 Sep 2021 11:51:01 -0400
Subject: [PATCH] fix(compiler-core): support ts syntax in expressions when
 isTS is true

---
 packages/compiler-core/src/compile.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/packages/compiler-core/src/compile.ts b/packages/compiler-core/src/compile.ts
index a3442fc8a03..95e3718964a 100644
--- a/packages/compiler-core/src/compile.ts
+++ b/packages/compiler-core/src/compile.ts
@@ -85,6 +85,14 @@ export function baseCompile(
   const ast = isString(template) ? baseParse(template, options) : template
   const [nodeTransforms, directiveTransforms] =
     getBaseTransformPreset(prefixIdentifiers)
+
+  if (!__BROWSER__ && options.isTS) {
+    const { expressionPlugins } = options
+    if (!expressionPlugins || !expressionPlugins.includes('typescript')) {
+      options.expressionPlugins = [...(expressionPlugins || []), 'typescript']
+    }
+  }
+
   transform(
     ast,
     extend({}, options, {