Dynamic file content in Terraform

I created a file dynamically in terraform. The creation goes into these steps:

• reading the content of some template files
• replacing the variables of the template with variables in terraform
• concatenating all the contents in one single file

The template files are read not following the order I set in the reference terraform map.. How can I keep the map order in the for loops?

Here the code:

locals {
  template_filenames_with_vars = {
    # key is template filename, value includes variables to replace in the template file
    bbb = {
      var = 1
    }

    aaa = {
      var = 1
    }
  }
}

resource "local_file" "myfile" {
  filename = "file.txt"

  content = <<EOT
${
  join("\n\n", [
    for filename, vars in local.template_filenames_with_vars :
        templatefile("${filename}.txt", vars)
  ])
}
  EOT
}

In the example the for loop in the local_file content loops in the order aaa,bbb instead of bbb,aaa.

Terraform uses lexical sorting in for loops, see Element Ordering, from the docs:

> For sets of strings, Terraform sorts the elements by their value, using lexical sorting.

So it's not possible to keep the map order in this case.

As previous post and comment said it is not possible to do that with maps, but it is possible to keep order if I use a list of objects:

locals {
  template_filenames_with_vars = [
    {
      name = "bbb"
      vars = {
        var = 1
      }
    },
    {
      name = "aaa"
      vars = {
        var = 1
      }
    },
  ]
}

resource "local_file" "myfile" {
  filename = "file.txt"

  content = <<EOT
${
  join("\n\n", [
    for filename in local.template_filenames_with_vars :
        templatefile("${filename.name}.txt", filename.vars)
  ])
}
  EOT
}

This keeps the order of the list (bbb then aaa).