function functionsSDKTooOld(loaded: any): boolean {
  const SDKRange = _.get(loaded, "dependencies.firebase-functions");
  try {
    if (!semver.intersects(SDKRange, ">=2")) {
      return true;
    }
  } catch (e) {
    // do nothing
  }
  return false;
}

    mergeMap(({version, depName, depVersion, npmPackageJson}) => {
      const updateVersion = _getVersionFromNpmPackage(npmPackageJson, version, loose);
      const npmPackageVersions = Object.keys(npmPackageJson['versions'] as JsonObject);
      const match = semver.maxSatisfying(npmPackageVersions, updateVersion);
      if (!match) {
        return EMPTY;
      }
      if (semver.lt(
        semverIntersect.parseRange(updateVersion).version,
        semverIntersect.parseRange(depVersion).version)
      ) {
        throw new SchematicsException(`Cannot downgrade package ${
          JSON.stringify(depName)} from version "${depVersion}" to "${updateVersion}".`,
        );
      }

      const innerNpmPackageJson = (npmPackageJson['versions'] as JsonObject)[match] as JsonObject;
      const dependencies: { [name: string]: string } = {};

      const deps = innerNpmPackageJson['peerDependencies'] as JsonObject;
      if (deps) {
        for (const depName of Object.keys(deps)) {
          dependencies[depName] = deps[depName] as string;
        }
      }

      logger.debug(`Recording update for ${JSON.stringify(depName)} to version ${updateVersion}.`);

      if (allVersions[depName]) {
        if (!semver.intersects(allVersions[depName], updateVersion)) {
          throw new SchematicsException(
            'Cannot update safely because packages have conflicting dependencies. Package '
            + `${depName} would need to match both versions "${updateVersion}" and `
            + `"${allVersions[depName]}, which are not compatible.`,
          );
        }

        allVersions[depName] = semverIntersect.intersect(allVersions[depName], updateVersion);
      } else {
        allVersions[depName] = updateVersion;
      }

      return _getRecursiveVersions(
        packageJson,
        dependencies,
        allVersions,
        logger,
        loose,
      );
    }),

comparatorResult = semver.rcompare(v1, v2, loose);
comparatorResult = semver.compareIdentifiers(str, str);
comparatorResult = semver.rcompareIdentifiers(str, str);
versionsArr = semver.sort(['', new semver.SemVer('')]);
versionsArr = semver.rsort(['', new semver.SemVer('')]);
diff = semver.diff(v1, v2, loose);

// Ranges
str = semver.validRange(str, loose);
bool = semver.satisfies(version, str, loose);
str = semver.maxSatisfying(versions, str, loose);
str = semver.minSatisfying(versions, str, loose);
bool = semver.gtr(version, str, loose);
bool = semver.ltr(version, str, loose);
bool = semver.outside(version, str, '<', loose);
bool = semver.intersects(str, str, loose);

let ver = new semver.SemVer(str, bool);
str = ver.raw;
bool = ver.loose;
str = ver.format();
str = ver.inspect();
str = ver.toString();

num = ver.major;
num = ver.minor;
num = ver.patch;
str = ver.version;
strArr = ver.build;
strArr = ver.prerelease;