문제
pod install 도중 firebase 관련 에러가 떴다.
The Swift podFirebaseCoreInternaldepends uponGoogleUtilities, which does not define modules. To opt into those targets generating module maps (which is necessary to import them from Swift when building as static libraries), you may setuse_modular_headers!globally in your Podfile, or specify:modular_headers => truefor particular dependencies.