An example shim for firebase-admin using REST calls under the hood.

example.js

module.exports = {
  ref(path) {
    return {
      async transaction(transform) {
        const token = await getToken();
        const res = await get({ path, token });
        return put({ path, token, data: transform(res) });
      },
      child(key) {
        return {
          async set(data) {
            const token = await getToken();
            return put({ path: `${path}/${key}`, data, token });
          },
        };
      },
    };
  },
};