jest.resolver.js

// jest.resolver.js
module.exports = (path, options) => {
  // Call the defaultResolver, so we leverage its cache, error handling, etc.
  return options.defaultResolver(path, {
    ...options,
    // Use packageFilter to process parsed `package.json` before the resolution (see https://www.npmjs.com/package/resolve#resolveid-opts-cb)
    packageFilter: (pkg) => {
      const pkgNamesToTarget = new Set([
        "@firebase/auth",
        "@firebase/analytics",
        "@firebase/storage",
        "@firebase/functions",
        "@firebase/database",
        "@firebase/auth-compat",
        "@firebase/database-compat",
        "@firebase/app-compat",
        "@firebase/firestore",
        "@firebase/firestore-compat",
        "@firebase/messaging",
        "@firebase/util",
        "firebase",
      ]);

      if (pkgNamesToTarget.has(pkg.name)) {
        delete pkg["exports"];
        delete pkg["module"];
      }

      return pkg;
    },
  });
};