Ignore backend.hcl and .tfilint.hcl

[ryboe]

backend.hcl is used to set up Terraform Cloud.
.tflint.hcl is used to configure tflint.

vscode-terraform currently flags false positive errors in both of these files. Both of these files should be ignored.

Below is a valid backend.hcl file that vscode-terraform is complaining about.

Here are similar errors from .tflint.hcl.

[tillig]

This seems somewhat related to #239 where again the issue seems to be that more general HCL files are being parsed as though they're specifically Terraform modules.

[radeksimko]

Hi folks,
There should no longer be errors or any other diagnostics for either of the two files produced by this extension as it only claims *.tf and *.tfvars files.

As for backend configuration, we track support of that in #636 but I would also point out that from v1.1.0 it is possible to configure Terraform Cloud via the new cloud block.

As for tflint support, we intend to integrate via code actions (tracked under #337 and more broadly under #635). As for highlighting .tflint.hcl files you can now use the HCL extension which we recently updated. We will eventually likely provide some additional basic functionality for HCL configs (which doesn't require schema and other metadata) via that HCL extension, such as hashicorp/vscode-hcl#98.

For any advanced IntelliSense features (completion, hover, etc.) within tflint config files, we do not intend to provide that as part of the Terraform extension nor Terraform LS, since tflint has its own schema (own keywords in its config files). However we'd be happy for anyone to create a dedicated tflint extension and/or language server, which claims .tflint.hcl. That allows all extensions to co-exist and each to keep only the necessary scope. A tflint extension can leverage the HCL extension for highlighting (i.e. let it be installed automatically with tflint extension).

As for building out the language server, we maintain https://github.com/hashicorp/hcl-lang which has still experimental (unstable) API, but is designed to be used to build any HCL2-based language server, such as tflint one.

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