add ts check to ci

Author: Maxcastel

pwa/package.json

@@ -10,7 +10,8 @@
     "i18n": "ts-node ./update-i18n.ts; prettier ./i18n/dictionaries/*.json --write",
     "prebuild": "ts-node ./prebuild.ts",
     "postbuild": "ts-node ./postbuild.ts",
-    "contributors": "ts-node ./contributors.ts"
+    "contributors": "ts-node ./contributors.ts",
+    "typecheck": "tsc --noEmit"
   },
   "dependencies": {
     "@docsearch/css": "^3.9.0",