Follow up of the terraform_map_duplicate_keys rule

docs/rules/README.md

@@ -13,6 +13,7 @@ All rules are enabled by default, but by setting `preset = "recommended"`, you c
 |[terraform_documented_outputs](terraform_documented_outputs.md)|Disallow `output` declarations without description||
 |[terraform_documented_variables](terraform_documented_variables.md)|Disallow `variable` declarations without description||
 |[terraform_empty_list_equality](terraform_empty_list_equality.md)|Disallow comparisons with `[]` when checking if a collection is empty|✔|
+|[terraform_map_duplicate_keys](terraform_map_duplicate_keys.md)|Disallow duplicate keys in a map object|✔|
 |[terraform_module_pinned_source](terraform_module_pinned_source.md)|Disallow specifying a git or mercurial repository as a module source without pinning to a version|✔|
 |[terraform_module_version](terraform_module_version.md)|Checks that Terraform modules sourced from a registry specify a version|✔|
 |[terraform_naming_convention](terraform_naming_convention.md)|Enforces naming conventions for resources, data sources, etc||

docs/rules/terraform_map_duplicate_keys.md

@@ -0,0 +1,39 @@
+# terraform_map_duplicate_keys
+
+Disallow duplicate keys in a map object.
+
+> This rule is enabled by "recommended" preset.
+
+## Example
+
+```hcl
+locals {
+  map = {
+    foo = 1
+    bar = 2
+    bar = 3 // duplicate key
+  }
+}
+```
+
+```
+$ tflint
+1 issue(s) found:
+
+Warning: Duplicate key: "bar", first defined at main.tf:4,5-8 (terraform_map_duplicate_keys)
+
+  on main.tf line 5:
+   5:     bar = 3 // duplicated key
+
+Reference: https://github.com/terraform-linters/tflint-ruleset-terraform/blob/v0.9.0/docs/rules/terraform_map_duplicate_keys.md
+```
+
+## Why
+
+In the Terraform language, duplicate map keys are overwritten rather than throwing an error. However, in most cases this behavior is not what you want and is often caused by a mistake. This rule will catch such mistakes early.
+
+See also https://github.com/hashicorp/terraform/issues/28727
+
+## How To Fix
+
+Remove the duplicate keys and leave the correct value.

go.mod

@@ -9,14 +9,13 @@ require (
 	github.com/hashicorp/go-version v1.7.0
 	github.com/hashicorp/hcl/v2 v2.21.0
 	github.com/hashicorp/terraform-registry-address v0.2.3
-	github.com/terraform-linters/tflint-plugin-sdk v0.20.0
+	github.com/terraform-linters/tflint-plugin-sdk v0.21.0
 	github.com/zclconf/go-cty v1.15.0
 )
 
 require (
 	cloud.google.com/go v0.112.0 // indirect
-	cloud.google.com/go/compute v1.24.0 // indirect
-	cloud.google.com/go/compute/metadata v0.2.3 // indirect
+	cloud.google.com/go/compute/metadata v0.3.0 // indirect
 	cloud.google.com/go/iam v1.1.6 // indirect
 	cloud.google.com/go/storage v1.36.0 // indirect
 	github.com/agext/levenshtein v1.2.1 // indirect
@@ -35,7 +34,7 @@ require (
 	github.com/googleapis/gax-go/v2 v2.12.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-hclog v1.6.3 // indirect
-	github.com/hashicorp/go-plugin v1.6.0 // indirect
+	github.com/hashicorp/go-plugin v1.6.1 // indirect
 	github.com/hashicorp/go-safetemp v1.0.0 // indirect
 	github.com/hashicorp/terraform-svchost v0.1.1 // indirect
 	github.com/hashicorp/yamux v0.1.1 // indirect
@@ -56,20 +55,19 @@ require (
 	go.opentelemetry.io/otel v1.22.0 // indirect
 	go.opentelemetry.io/otel/metric v1.22.0 // indirect
 	go.opentelemetry.io/otel/trace v1.22.0 // indirect
-	golang.org/x/crypto v0.22.0 // indirect
-	golang.org/x/mod v0.17.0 // indirect
-	golang.org/x/net v0.24.0 // indirect
-	golang.org/x/oauth2 v0.17.0 // indirect
+	golang.org/x/crypto v0.25.0 // indirect
+	golang.org/x/mod v0.19.0 // indirect
+	golang.org/x/net v0.27.0 // indirect
+	golang.org/x/oauth2 v0.20.0 // indirect
 	golang.org/x/sync v0.7.0 // indirect
-	golang.org/x/sys v0.19.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/sys v0.22.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
-	golang.org/x/tools v0.20.0 // indirect
+	golang.org/x/tools v0.23.0 // indirect
 	google.golang.org/api v0.162.0 // indirect
-	google.golang.org/appengine v1.6.8 // indirect
 	google.golang.org/genproto v0.0.0-20240227224415-6ceb2ff114de // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20240227224415-6ceb2ff114de // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de // indirect
-	google.golang.org/grpc v1.63.2 // indirect
-	google.golang.org/protobuf v1.34.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20240528184218-531527333157 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 // indirect
+	google.golang.org/grpc v1.65.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
 )