| archive/zip | Package zip provides support for reading and writing ZIP archives. |
| bytes | Package bytes implements functions for the manipulation of byte slices. |
| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| flag | Package flag implements command-line flag parsing. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/rogpeppe/go-internal/module | Package module is a thin forwarding layer on top of golang.org/x/mod/module. |
| github.com/rogpeppe/go-internal/par | Package par implements parallel execution helpers. |
| github.com/rogpeppe/go-internal/semver | Package semver is a thin forwarding layer on top of golang.org/x/mod/semver. |
| github.com/rogpeppe/go-internal/txtar | Package txtar implements a trivial text-based file archive format. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| log | Package log implements a simple logging package. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| net/http | Package http provides HTTP client and server implementations. |
| 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. |
| regexp | Package regexp implements regular expression search. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| testing | Package testing provides support for automated testing of Go packages. |