Package addrs contains types that represent "addresses", which are references to specific objects within a Terraform configuration or state.

Package configs contains types that represent Terraform configurations and the different elements thereof.

Package earlyconfig is a specialized alternative to the top-level "configs" package that does only shallow processing of configuration and is therefore able to be much more liberal than the full config loader in what it accepts.

Package initwd contains various helper functions used by the "terraform init" command to initialize a working directory.

Package lang deals with the runtime aspects of Terraform's configuration language, with concerns such as expression evaluation.

Package modsdir is an internal package containing the model types used to represent the manifest of modules in a local modules cache directory.

Package moduledeps contains types that can be used to describe the providers required for all of the modules in a module tree.

Package plans contains the types that are used to represent Terraform plans.

Package providers contains the interface and primary types required to implement a Terraform resource provider.

Package provisioners contains the interface and primary types to implement a Terraform resource provisioner.

Package states contains the types that are used to represent Terraform states.

Package tfdiags is a utility package for representing errors and warnings in a manner that allows us to produce good messages for the user.

The version package provides a location to set the release versions for all packages to consume, without creating import cycles.