terraform_unused_required_providers does not support provider-defined functions

[bgpat]

Summary

The terraform_unused_required_providers rule does not support provider-defined functions, which were introduced in Terraform 1.8. As a result, valid configurations that utilize provider-defined functions are incorrectly flagged as unused providers.

https://www.hashicorp.com/blog/terraform-1-8-improves-extensibility-with-provider-defined-functions

Command

tflint

Terraform Configuration

terraform {
  required_providers {
    time = {
      source = "hashicorp/time"
    }
  }
  required_version = ">= 1.8"
}

output "example_output" {
  value = provider::time::rfc3339_parse("2023-07-25T23:43:16Z")
}

TFLint Configuration

rule "terraform_unused_required_providers" {
  enabled = true
}

Output

$ tflint
1 issue(s) found:

Warning: provider 'time' is declared in required_providers but not used by the module (terraform_unused_required_providers)

  on main.tf line 3:
   3:     time = {
   4:       source = "hashicorp/time"
   5:     }

Reference: https://github.com/terraform-linters/tflint-ruleset-terraform/blob/v0.9.1/docs/rules/terraform_unused_required_providers.md

TFLint Version

0.53.0

Terraform Version

1.9.5

Operating System

• Linux
• macOS
• Windows