Terraform 1 9

Terraform 1.9

This overview applies when the project's target Terraform version is at least 1.9.

Expressions and validation

• Input-variable validation conditions can refer to other input variables, data resources, and other objects in the same module. This permits cross-field and environment-aware validation.
• templatestring(template, vars) renders template text obtained dynamically, complementing templatefile for templates loaded from a data source or other expression.

variable "min_size" {
  type = number
}

variable "max_size" {
  type = number

  validation {
    condition     = var.max_size >= var.min_size
    error_message = "max_size must not be smaller than min_size."
  }
}

CLI and testing

• terraform init -json emits machine-readable UI output for automation.
• Interactive terraform console accepts multi-line expressions when delimiters remain open.
• Terraform tests can pass dynamically sensitive values to variables without requiring a static sensitive = true declaration on the receiving variable.
• A moved block can migrate null_resource instances to the built-in terraform_data resource type.