fix(compiler-sfc): bail on import usage check when template has custom lang

fix #4312

diff --git a/packages/compiler-sfc/src/compileScript.ts b/packages/compiler-sfc/src/compileScript.ts
index 9e4a2ceb85a49a890ca60b924518a0dff407dcec..914cf28353110607b348e9e641bcd082a7f68516 100644 (file)
--- a/packages/compiler-sfc/src/compileScript.ts
+++ b/packages/compiler-sfc/src/compileScript.ts
@@ -332,7 +332,7 @@ export function compileScript(
     }
 
     let isUsedInTemplate = true
-    if (isTS && sfc.template && !sfc.template.src) {
+    if (isTS && sfc.template && !sfc.template.src && !sfc.template.lang) {
       isUsedInTemplate = new RegExp(
         // #4274 escape $ since it's a special char in regex
         // (and is the only regex special char that is valid in identifiers)