| ext/customdecode | Package customdecode contains a HCL extension that allows, in certain contexts, expression evaluation to be overridden by custom static analysis. |
| ext/dynblock | Package dynblock provides an extension to HCL that allows dynamic declaration of nested blocks in certain contexts via a special block type named "dynamic". |
| ext/transform | Package transform is a helper package for writing extensions that work by applying transforms to bodies. |
| ext/tryfunc | Package tryfunc contains some optional functions that can be exposed in HCL-based languages to allow authors to test whether a particular expression can succeed and take dynamic action based on that result. |
| ext/typeexpr | Package typeexpr extends HCL with a convention for describing HCL types within configuration files. |
| ext/userfunc | Package userfunc implements a HCL extension that allows user-defined functions in HCL configuration. |