fix

Author: ota-meshi

lib/utils/ts-utils/typescript.js

@@ -33,8 +33,11 @@ module.exports = {
  * Get TypeScript instance
  */
 function getTypeScript() {
+  if (cacheTypeScript) {
+    return cacheTypeScript
+  }
   try {
-    return (cacheTypeScript ??= require('typescript'))
+    return (cacheTypeScript = require('typescript'))
   } catch (error) {
     if (/** @type {any} */ (error).code === 'MODULE_NOT_FOUND') {
       return undefined