Terraform 1 13

Terraform 1.13

This overview applies when the project's target Terraform version is at least 1.13.

Stacks and automation

• The terraform stacks command exposes stack operations through a separately installed Stacks plugin. Available subcommands depend on that plugin and are discoverable with terraform stacks -help.
• terraform rpcapi is generally available for internal integrations using the go-plugin-compatible RPC interface; it is not a stable public automation surface.

Testing

• Test files can declare definitions for external variables they reference, improving type checking and diagnostics for complex inputs.
• File-level variable values can refer to run outputs and other variables.
• Test teardown operations can execute in parallel where their dependencies permit it.

Validation and state

• Filesystem functions are checked for consistent results between evaluation phases, exposing configuration that would otherwise produce an inconsistent final plan.
• Static validation detects more invalid indexed references before provider operations.
• Nested module outputs preserve their sensitivity marks through state and evaluation.