diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..6c7f640
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,5 @@
+{
+    "plugins": [
+        "@babel/plugin-proposal-optional-chaining"
+    ]
+}
diff --git a/package.json b/package.json
index ff710d7..0c6b35f 100644
--- a/package.json
+++ b/package.json
@@ -48,6 +48,7 @@
         "vite": "^4.1.3"
     },
     "devDependencies": {
+        "@babel/plugin-proposal-optional-chaining": "^7.21.0",
         "@types/node": "^18.14.1",
         "@vuepress/core": "^2.0.0-beta.60",
         "@vuepress/utils": "^2.0.0-beta.60",
diff --git a/src/node/plugins/replacer.ts b/src/node/plugins/replacer.ts
index 89bbdae..4e7670d 100644
--- a/src/node/plugins/replacer.ts
+++ b/src/node/plugins/replacer.ts
@@ -70,7 +70,7 @@ export class Replacer
 
             link = link.replace('$' + i, match[i])
 
-            value = replaces !== undefined && replaces[i] !== undefined
+            value = !! replaces?.[i]
                 ? value.replace('$' + i, replaces[i](match[i]))
                 : value.replace('$' + i, match[i])
         }