A sad story of using flutterfire

[pedia]

Since two days ago, I add a firebase plugin into a flutter project.
But flutter build is not finished even now. Obviously, here is the mainland of China.

The most major reason is the very slow speed of accessing Github.

fatal: unable to access 'https://github.com/google/boringssl.git/': LibreSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443

PING github.com (13.250.177.223): 56 data bytes
64 bytes from 13.250.177.223: icmp_seq=0 ttl=46 time=98.101 ms
Request timeout for icmp_seq 1
64 bytes from 13.250.177.223: icmp_seq=2 ttl=46 time=94.155 ms
64 bytes from 13.250.177.223: icmp_seq=3 ttl=46 time=93.317 ms
Request timeout for icmp_seq 4
64 bytes from 13.250.177.223: icmp_seq=5 ttl=46 time=95.153 ms
64 bytes from 13.250.177.223: icmp_seq=6 ttl=46 time=93.416 ms
64 bytes from 13.250.177.223: icmp_seq=7 ttl=46 time=98.576 ms
64 bytes from 13.250.177.223: icmp_seq=8 ttl=46 time=93.273 ms
Request timeout for icmp_seq 9
Request timeout for icmp_seq 10
64 bytes from 13.250.177.223: icmp_seq=11 ttl=46 time=94.944 ms
^C
--- github.com ping statistics ---
12 packets transmitted, 8 packets received, 33.3% packet loss
round-trip min/avg/max/stddev = 93.273/95.117/98.576/1.980 ms

Second, Three are huge amount of dependencies that should be downloaded:

module	Size(bytes)
Pod Specs	2100M
boringssl	640M
grpc	367M
abseil	??M

I tried everything that I know:

• Add Pod spec mirror.
• Add CP_HOME_DIR to prevent cache unavaliable in pod update.
• Dead loop execute while true; do pod install; done.
• Add git proxy.
• Hack cocoapods to force shallow clone of new pod. Since 2016 shallow clones were disallow.
• Add cocoapods-binary-cache.
• Write a small tool to speedup Maven.

I love Flutter and Firebase very much. But the cost of using is very expensive.

So my question is:
Is that possible to accessing firebase in pure Dart?