How to fix There is no function named trimprefix in Terraform

Run the version command to see what version of Terraform you have installed:

terraform version

This will output your Terraform version, for example: Terraform v0.12.15 or Terraform v1.5.0. If your version is 0.12.15 or earlier, you need to upgrade.

Download and install a newer version of Terraform from the official HashiCorp releases. The trimprefix function is available in all versions from 0.12.16 onwards.

For most users, upgrading to Terraform 1.x is recommended:

# On macOS with Homebrew
brew upgrade terraform

# On Linux, download from https://www.terraform.io/downloads
# Extract to your PATH, typically /usr/local/bin

After upgrading, verify the new version:

terraform version

If you're using modules from the Terraform Registry or a Git repository, verify they don't require a newer Terraform version than what you have. Check the module's README or source for a required_version constraint.

If a module requires a newer version, either upgrade Terraform or switch to an older version of the module:

# Example: specify an older module version
module "example" {
  source = "terraform-aws-modules/vpc/aws"
  version = "~> 2.0"  # Use older version compatible with your Terraform
}

Once you've upgraded to Terraform 0.12.16 or later, verify your trimprefix usage is correct:

# Syntax: trimprefix(string, prefix)
locals {
  resource_name = "dev-my-database"
  without_prefix = trimprefix(local.resource_name, "dev-")  # Returns "my-database"
}

output "name" {
  value = local.without_prefix
}

Run terraform validate to check for syntax errors:

terraform validate