chore: support optional chaining operator in vuepress

Amorites · Amorites · commit 055b5896814a · 2022-09-11T21:01:17.000+08:00
diff --git a/tsconfig.json b/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "ES2020",
+    "target": "ES2019",
     "module": "commonjs",
     "lib": ["es2020"],
     "allowJs": true,
