| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| github.com/open-policy-agent/opa/internal/compiler/wasm | Package wasm contains an IR->WASM compiler backend. |
| 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/types | Package types declares data types for Rego values and helper functions to operate on these types. |
| log | Package log implements a simple logging package. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |