| errors | Package errors implements functions to manipulate errors. |
| flag | Package flag implements command-line flag parsing. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| google.golang.org/protobuf/cmd/protoc-gen-go/internal_gengo | Package internal_gengo is internal to the protobuf module. |
| google.golang.org/protobuf/compiler/protogen | Package protogen provides support for writing protoc plugins. |
| google.golang.org/protobuf/internal/version | Package version records versioning information about this module. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| path/filepath | Package filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths. |