diff --git a/packages/@vuepress/core/lib/internal-plugins/importAsyncComponent.js b/packages/@vuepress/core/lib/internal-plugins/importAsyncComponent.js
index 33bfb42316005bcc746b6a7af8acc1df3425c061..acb1aec1d1b6ee0fb8cdc1f8468d69c51ab71c7d 100644
--- a/packages/@vuepress/core/lib/internal-plugins/importAsyncComponent.js
+++ b/packages/@vuepress/core/lib/internal-plugins/importAsyncComponent.js
@@ -1,7 +1,7 @@
 function genImportAsyncComponentFile (pages) {
   return `export function loadComponent (key) {
   switch (key) {
-${pages.map(({ key, _filePath }) => `    case "${key}": return import("${_filePath}");`).join('\n')}
+${pages.map(({ key, _filePath }) => `    case ${JSON.stringify(key)}: return import(${JSON.stringify(_filePath)});`).join('\n')}
   }
 }`
 }
diff --git a/packages/@vuepress/core/lib/plugin-api/option/EnhanceAppFilesOption.js b/packages/@vuepress/core/lib/plugin-api/option/EnhanceAppFilesOption.js
index 3444c7840b60562a10a28ca1ef2a75659b7b52b1..3fc8e218db7a9fd98674f94d743fcc044fd50af6 100644
--- a/packages/@vuepress/core/lib/plugin-api/option/EnhanceAppFilesOption.js
+++ b/packages/@vuepress/core/lib/plugin-api/option/EnhanceAppFilesOption.js
@@ -51,7 +51,7 @@ module.exports = class EnhanceAppFilesOption extends Option {
         if (fs.existsSync(filePath)) {
           destPath = await context.writeTemp(
             `app-enhancers/enhancer-${moduleId++}.js`,
-            `export { default } from '${(filePath)}'`
+            `export { default } from ${JSON.stringify(filePath)}`
           )
         } else {
           logger.debug(