Upgrading to CDK for Terraform Version 0.12

0.12 includes improvements to the provider code bindings, allowing for shorter attribute names for recursive attributes.

Simplified interfaces of recursive attributes

The generated provider bindings are based on the Terraform schema which does not support recursion and hence uses a large, explicit structure instead. Previously this resulted in long names such as e.g. Wafv2WebAclRuleStatementAndStatementStatementOrStatementStatementLabelMatchStatement. In 0.12 we implemented a first rough detection for this underlying recursion which drastically reduced the amount of generated interfaces as they now are converted to recursive data structures themselves. If you are currently using those types e.g. in a language like Java, you will need to change them to the new shorter names.

cdktf get exits with 0 exit code when no provider / module specifications are found in the cdktf.json

Previously we would throw an error and exit with 1 if there were no provider or module specifications in the cdktf.json file. This can be inconvenient if cdktf get is part of a workflow.

Fn.merge is split into Fn.mergeLists and Fn.mergeMaps

The Terraform merge function can merge both lists and maps, but this can cause issues when using the result in a typed language. Therefore we split it into Fn.mergeLists and Fn.mergeMaps, this means you need to change your cdktf programs code.