| bytes | Package bytes implements functions for the manipulation of byte slices. |
| encoding/binary | Package binary implements simple translation between numbers and byte sequences and encoding and decoding of varints. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| google.golang.org/grpc/codes | Package codes defines the canonical error codes used by gRPC. |
| google.golang.org/grpc/credentials/alts/internal/conn | Package conn contains an implementation of a secure channel created by gRPC handshakers. |
| google.golang.org/grpc/credentials/alts/internal/proto/grpc_gcp | |
| io | Package io provides basic interfaces to I/O primitives. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |