| github.com/open-policy-agent/opa/v1/ast | Package ast declares Rego syntax tree types and also includes a parser and compiler for preparing policies for execution in the policy engine. |
| github.com/open-policy-agent/opa/v1/util | Package util provides generic utilities used throughout the policy engine. |
| github.com/open-policy-agent/opa/v1/version | Package version contains version information that is set at build time. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |