| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/oauth2 | Package oauth2 provides support for making OAuth2 authorized and authenticated HTTP requests. |
| golang.org/x/oauth2/google | Package google provides support for making OAuth2 authorized and authenticated HTTP requests to Google APIs. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| 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. |
| runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. |