fix

src/parser/espree.ts

@@ -19,7 +19,8 @@ const createRequire: (filename: string) => (modName: string) => any =
     return mod.exports;
   });
 
-let espreeCache: BasicParserObject | null = null;
+let espreeCache: (BasicParserObject & { latestEcmaVersion: number }) | null =
+  null;
 
 /** Checks if given path is linter path */
 function isLinterPath(p: string): boolean {
@@ -35,7 +36,7 @@ function isLinterPath(p: string): boolean {
  * Load `espree` from the loaded ESLint.
  * If the loaded ESLint was not found, just returns `require("espree")`.
  */
-export function getEspree(): BasicParserObject {
+export function getEspree(): BasicParserObject & { latestEcmaVersion: number } {
   if (!espreeCache) {
     // Lookup the loaded eslint
     const linterPath = Object.keys(require.cache || {}).find(isLinterPath);

src/parser/html.ts

@@ -241,9 +241,11 @@ function parseAttributeMustache(state: State):
     if (state.eat("}")) {
       const end = endCandidate;
       try {
+        const espree = getEspree();
+
         const expression = (
-          getEspree().parse(state.code.slice(start, end), {
-            ecmaVersion: "latest",
+          espree.parse(state.code.slice(start, end), {
+            ecmaVersion: espree.latestEcmaVersion,
           }).body[0] as ESTree.ExpressionStatement
         ).expression;
         delete expression.range;