Fix FirebaseNamespace

Author: schmidt-sebastian

packages/firestore/package.json

@@ -8,7 +8,7 @@
   "author": "Firebase <[email protected]> (https://firebase.google.com/)",
   "scripts": {
     "bundle": "rollup -c",
-    "prebuild": "tsc --emitDeclarationOnly --declaration -p tsconfig.json; yarn api-report",
+    "prebuild": "yarn test:prepare && tsc --emitDeclarationOnly --declaration -p tsconfig.json; yarn api-report",
     "build": "run-p build:lite build:main",
     "build:release": "yarn build && yarn typings:public",
     "build:scripts": "tsc -moduleResolution node --module commonjs scripts/*.ts && ls scripts/*.js | xargs -I % sh -c 'terser %  -o %'",