| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| google.golang.org/protobuf/encoding/protowire | Package protowire parses and formats the raw wire encoding. |
| google.golang.org/protobuf/internal/encoding/defval | Package defval marshals and unmarshals textual forms of default values. |
| google.golang.org/protobuf/internal/errors | Package errors implements functions to manipulate errors. |
| google.golang.org/protobuf/internal/filedesc | Package filedesc provides functionality for constructing descriptors. |
| google.golang.org/protobuf/internal/flags | Package flags provides a set of flags controlled by build tags. |
| google.golang.org/protobuf/internal/pragma | Package pragma provides types that can be embedded into a struct to statically enforce or prevent certain language properties. |
| google.golang.org/protobuf/internal/strs | Package strs provides string manipulation functionality specific to protobuf. |
| google.golang.org/protobuf/proto | Package proto provides functions operating on protocol buffer messages. |
| google.golang.org/protobuf/reflect/protoreflect | Package protoreflect provides interfaces to dynamically manipulate messages. |
| google.golang.org/protobuf/reflect/protoregistry | Package protoregistry provides data structures to register and lookup protobuf descriptor types. |
| google.golang.org/protobuf/types/descriptorpb | |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| unicode | Package unicode provides data and functions to test some properties of Unicode code points. |