| bytes | Package bytes implements functions for the manipulation of byte slices. |
| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/open-policy-agent/opa/internal/file/url | Package url contains helpers for dealing with file paths and URLs. |
| 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/ast/location | Package location defines locations in Rego source code. |
| github.com/open-policy-agent/opa/v1/logging | |
| github.com/open-policy-agent/opa/v1/rego | Package rego exposes high level APIs for evaluating Rego policies. |
| github.com/open-policy-agent/opa/v1/storage | Package storage exposes the policy engine's storage layer. |
| github.com/open-policy-agent/opa/v1/storage/inmem | Package inmem implements an in-memory version of the policy engine's storage layer. |
| github.com/open-policy-agent/opa/v1/topdown | Package topdown provides low-level query evaluation support. |
| github.com/open-policy-agent/opa/v1/topdown/print | |
| github.com/open-policy-agent/opa/v1/util | Package util provides generic utilities used throughout the policy engine. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| slices | Package slices defines various functions useful with slices of any type. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |