docs: add internal types in apidoc (#734)

* docs: add internal types in apidoc

* chore: downgrade package-lock version for NodeJS 14

* test: test case when performance uses Date.now

docs/package.json

@@ -3,7 +3,7 @@
   "version": "0.0.0",
   "private": true,
   "hexo": {
-    "version": "5.4.0"
+    "version": "7.3.0"
   },
   "scripts": {
     "build": "hexo generate",
@@ -13,7 +13,7 @@
   },
   "dependencies": {
     "cheerio": "^0.22.0",
-    "hexo": "^5.4.0",
+    "hexo": "^7.3.0",
     "hexo-algolia": "^1.3.1",
     "hexo-clean-css": "^1.0.0",
     "hexo-filter-nofollow": "^2.0.2",
@@ -34,4 +34,4 @@
   "engines": {
     "node": ">=8.10.0"
   }
-}
+}