Clears everything recursively in your Firestore database. Useful in the cleanUp routine of any tests.

cleanDB.js

const clearCollection = db => async collections => {
  await Promise.all(
    collections.map(async collection => {
      // get documents
      const documents = await collection.listDocuments();
      await Promise.all(
        documents.map(async doc => {
          const collections = await db.doc(`${doc.path}`).listCollections();
          //           If document has a sub collection delete that first
          if (collections.length > 0) {
            await clearCollection(db)(collections);
          }
          await doc.delete();
        })
      );
    })
  );
};

const clearDB = async db => {
  // get root collections
  const collections = await db.listCollections();

  // delete root collections
  return clearCollection(db)(collections);
};


module.exports = {clearDB, clearCollection};


// clearDB(admin.firestore()) will delete everything in your database
// clearCollection(admin.firestore())(collectionRef) will delete everything within a collection