| bytes | Package bytes implements functions for the manipulation of byte slices. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/text/internal/format | Package format contains types for defining language-specific formatting of values. |
| golang.org/x/text/internal/number | Package number contains tools and data for formatting numbers. |
| golang.org/x/text/language | Package language implements BCP 47 language tags and related functionality. |
| golang.org/x/text/message/catalog | Package catalog defines collections of translated format strings. |
| io | Package io provides basic interfaces to I/O primitives. |
| math | Package math provides basic constants and mathematical functions. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| unicode/utf8 | Package utf8 implements functions and constants to support text encoded in UTF-8. |