remove support of go 1.21

.golangci.yml

@@ -14,6 +14,10 @@ linters-settings:
       Use of this source code is governed by a MIT license found in the LICENSE file.
   goimports:
     local-prefixes: github.com/nil-go/konf
+  gosec:
+    excludes:
+      # Flags for potentially-unsafe casting of ints, similar problem to globally-disabled G103
+      - G115
   govet:
     enable:
       - shadow
@@ -41,7 +45,7 @@ linters:
     - canonicalheader
     - containedctx
     - contextcheck
-    # copyloopvar // go 1.22
+    - copyloopvar
     - cyclop
     - decorder
     # depguard
@@ -54,7 +58,6 @@ linters:
     - errchkjson
     - errname
     - errorlint
-    - exportloopref
     - exhaustive
     # exhaustruct
     - fatcontext

CHANGELOG.md

@@ -7,6 +7,10 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+### Removed
+
+- Remove support for Golang 1.21 (#457).
+
 ## [1.2.2] - 2024-07-08
 
 ### Fixed

README.md

@@ -16,7 +16,8 @@ becoming coupled to a particular configuration source.
 - [konf.OnChange](#usage) for registering callbacks while configuration changes.
 - [konf.Explain](#understand-the-configuration) for understanding where the configuration is loaded from.
 - [Various providers](#configuration-providers) for loading configuration from major clouds,
-  [AWS](examples/aws), [Azure](examples/azure), and [GCP](examples/gcp) with [Notifier](notifier) for notifying the changes of configuration.
+  [AWS](examples/aws), [Azure](examples/azure), and [GCP](examples/gcp) with [Notifier](notifier) for notifying the
+  changes of configuration.
 - [Zero dependencies](go.mod) in core module which supports loading configuration
   from environment variables,flags, and embed file system.
 
@@ -112,6 +113,7 @@ while the configuration source(s) is managed "up stack" (e.g. in or near `main()
 Application developers can then switch configuration sources(s) as necessary.
 
 ## Change Notification
+
 The providers for loading configuration from clouds periodically poll the configuration source.
 It also supports watching the changes of configuration using corresponding notifier.
 For example, the `sns` notifier notifies the changes of `appconfig`  and `s3` provider:
@@ -150,22 +152,24 @@ to monitor the status of configuration loading/watching, e.g. recording metrics.
 
 There are providers for the following configuration sources.
 
-| Loader                                    | Load From                                                                               | Watch Changes | Notifier                  |
-|:------------------------------------------|:----------------------------------------------------------------------------------------|:-------------:|:--------------------------|
-| [`env`](provider/env)                     | environment variables                                                                   |               |                           |
-| [`fs`](provider/fs)                       | [fs.FS](https://pkg.go.dev/io/fs)                                                       |               |                           |
-| [`file`](provider/file)                   | file                                                                                    |       ✓       |                           |
-| [`flag`](provider/flag)                   | [flag](https://pkg.go.dev/flag)                                                         |               |                           |
-| [`pflag`](provider/pflag)                 | [spf13/pflag](https://github.com/spf13/pflag)                                           |               |                           |
-| [`appconfig`](provider/appconfig)         | [AWS AppConfig](https://aws.amazon.com/systems-manager/features/appconfig/)             |       ✓       | [sns](notifier/sns)       |
-| [`s3`](provider/s3)                       | [AWS S3](https://aws.amazon.com/s3)                                                     |       ✓       | [sns](notifier/sns)       |
-| [`parameterstore`](provider/parameterstore)           | [AWS ParameterStore](https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-parameter-store.html)                                         |       ✓       | [sns](notifier/sns)       |
-| [`azappconfig`](provider/azappconfig)     | [Azure App Configuration](https://azure.microsoft.com/en-us/products/app-configuration) |       ✓       | [azservicebus](notifier/azservicebus) |
-| [`azblob`](provider/azblob)               | [Azure Blob Storage](https://azure.microsoft.com/en-us/products/storage/blobs)          |       ✓       | [azservicebus](notifier/azservicebus) |
-| [`secretmanager`](provider/secretmanager) | [GCP Secret Manager](https://cloud.google.com/security/products/secret-manager)         |       ✓       | [pubsub](notifier/pubsub) |
-| [`gcs`](provider/gcs)                     | [GCP Cloud Storage](https://cloud.google.com/storage)                                   |       ✓       | [pubsub](notifier/pubsub) |
-
-[cobra](https://github.com/spf13/cobra) is supported through the [`pflag`](provider/pflag) loader, with the [`pflag.WithFlagSet`](https://pkg.go.dev/github.com/nil-go/konf/provider/pflag#WithFlagSet) option:  
+| Loader                                      | Load From                                                                                                               | Watch Changes | Notifier                              |
+|:--------------------------------------------|:------------------------------------------------------------------------------------------------------------------------|:-------------:|:--------------------------------------|
+| [`env`](provider/env)                       | environment variables                                                                                                   |               |                                       |
+| [`fs`](provider/fs)                         | [fs.FS](https://pkg.go.dev/io/fs)                                                                                       |               |                                       |
+| [`file`](provider/file)                     | file                                                                                                                    |       ✓       |                                       |
+| [`flag`](provider/flag)                     | [flag](https://pkg.go.dev/flag)                                                                                         |               |                                       |
+| [`pflag`](provider/pflag)                   | [spf13/pflag](https://github.com/spf13/pflag)                                                                           |               |                                       |
+| [`appconfig`](provider/appconfig)           | [AWS AppConfig](https://aws.amazon.com/systems-manager/features/appconfig/)                                             |       ✓       | [sns](notifier/sns)                   |
+| [`s3`](provider/s3)                         | [AWS S3](https://aws.amazon.com/s3)                                                                                     |       ✓       | [sns](notifier/sns)                   |
+| [`parameterstore`](provider/parameterstore) | [AWS ParameterStore](https://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-parameter-store.html) |       ✓       | [sns](notifier/sns)                   |
+| [`azappconfig`](provider/azappconfig)       | [Azure App Configuration](https://azure.microsoft.com/en-us/products/app-configuration)                                 |       ✓       | [azservicebus](notifier/azservicebus) |
+| [`azblob`](provider/azblob)                 | [Azure Blob Storage](https://azure.microsoft.com/en-us/products/storage/blobs)                                          |       ✓       | [azservicebus](notifier/azservicebus) |
+| [`secretmanager`](provider/secretmanager)   | [GCP Secret Manager](https://cloud.google.com/security/products/secret-manager)                                         |       ✓       | [pubsub](notifier/pubsub)             |
+| [`gcs`](provider/gcs)                       | [GCP Cloud Storage](https://cloud.google.com/storage)                                                                   |       ✓       | [pubsub](notifier/pubsub)             |
+
+[cobra](https://github.com/spf13/cobra) is supported through the [`pflag`](provider/pflag) loader, with the [
+`pflag.WithFlagSet`](https://pkg.go.dev/github.com/nil-go/konf/provider/pflag#WithFlagSet) option:
+
 ```go
 config.Load(kflag.New(&config, kflag.WithFlagSet(yourCobraCmd.Flags())))
 ```

benchmark/go.mod

@@ -1,6 +1,6 @@
 module github.com/nil-go/konf/benchmark
 
-go 1.21
+go 1.22
 
 require (
 	github.com/knadh/koanf/providers/env v0.1.0

config_test.go

@@ -49,8 +49,6 @@ func TestConfig_Load(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 
@@ -260,8 +258,6 @@ func TestConfig_Unmarshal(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 
@@ -355,8 +351,6 @@ Here are other value(loader)s:
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

go.mod

@@ -1,5 +1,5 @@
 module github.com/nil-go/konf
 
-go 1.21
+go 1.22
 
 retract v0.6.1 // It does not work while file is not exist

internal/convert/converter_test.go

@@ -924,8 +924,6 @@ func TestConverter(t *testing.T) { //nolint:maintidx
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

internal/convert/option.go

@@ -46,8 +46,8 @@ func withHookFunc[F, T any](hookFunc func(F, T) error) Option {
 		}
 
 		options.hooks = append(options.hooks, hook{
-			fromType: reflect.TypeOf((*F)(nil)).Elem(),
-			toType:   reflect.TypeOf((*T)(nil)).Elem(),
+			fromType: reflect.TypeFor[F](),
+			toType:   reflect.TypeFor[T](),
 			hook: func(f, t any) error {
 				from, ok := f.(F)
 				if !ok {

internal/maps/insert_test.go

@@ -62,8 +62,6 @@ func TestInsert(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

internal/maps/merge_test.go

@@ -76,8 +76,6 @@ func TestMerge(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

internal/maps/sub_test.go

@@ -81,13 +81,12 @@ func TestSub(t *testing.T) {
 		},
 	}
 
-	for _, tc := range testcases {
-		tc := tc
-		t.Run(tc.description, func(t *testing.T) {
+	for _, testcase := range testcases {
+		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 
-			actual := maps.Sub(tc.values, tc.path, ".")
-			assert.Equal(t, tc.expected, actual)
+			actual := maps.Sub(testcase.values, testcase.path, ".")
+			assert.Equal(t, testcase.expected, actual)
 		})
 	}
 }

internal/maps/transform_test.go

@@ -45,13 +45,12 @@ func TestTransformKeys(t *testing.T) {
 		},
 	}
 
-	for _, tc := range testcases {
-		tc := tc
-		t.Run(tc.description, func(t *testing.T) {
+	for _, testcase := range testcases {
+		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 
-			maps.TransformKeys(tc.src, tc.keyMap, tc.mapKeyCaseSensitive)
-			assert.Equal(t, tc.expected, tc.src)
+			maps.TransformKeys(testcase.src, testcase.keyMap, testcase.mapKeyCaseSensitive)
+			assert.Equal(t, testcase.expected, testcase.src)
 		})
 	}
 }

internal/nocopy.go

@@ -17,6 +17,6 @@ func (c *NoCopy[T]) Check() {
 	}
 
 	if c.addr != c {
-		panic("illegal use of non-zero " + reflect.TypeOf((*T)(nil)).Elem().Name() + " copied by value")
+		panic("illegal use of non-zero " + reflect.TypeFor[T]().Name() + " copied by value")
 	}
 }

notifier/azservicebus/go.mod

@@ -1,6 +1,6 @@
 module github.com/nil-go/konf/notifier/azservicebus
 
-go 1.21
+go 1.22
 
 require (
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.14.0

notifier/pubsub/go.mod

@@ -1,6 +1,6 @@
 module github.com/nil-go/konf/notifier/pubsub
 
-go 1.21
+go 1.22
 
 require (
 	cloud.google.com/go/compute/metadata v0.5.0

notifier/pubsub/notifier_test.go

@@ -91,7 +91,6 @@ level=WARN msg="Fail to delete pubsub subscription." topic=topic subscription=pr
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

notifier/sns/go.mod

@@ -1,6 +1,6 @@
 module github.com/nil-go/konf/notifier/sns
 
-go 1.21
+go 1.22
 
 require (
 	github.com/aws/aws-sdk-go-v2 v1.30.4

notifier/sns/notifier_test.go

@@ -767,7 +767,6 @@ level=WARN msg="Fail to delete sqs message." queue=https://sqs.us-west-2.amazona
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

provider/appconfig/appconfig_test.go

@@ -158,8 +158,6 @@ func TestAppConfig_Load(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 
@@ -676,8 +674,6 @@ func TestAppConfig_Watch(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

provider/appconfig/go.mod

@@ -1,6 +1,6 @@
 module github.com/nil-go/konf/provider/appconfig
 
-go 1.21
+go 1.22
 
 require (
 	github.com/aws/aws-sdk-go-v2 v1.30.4

provider/azappconfig/appconfig_test.go

@@ -113,8 +113,6 @@ func TestAppConfig_Load(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 
@@ -216,8 +214,6 @@ list settings error
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

provider/azappconfig/go.mod

@@ -1,6 +1,6 @@
 module github.com/nil-go/konf/provider/azappconfig
 
-go 1.21
+go 1.22
 
 require (
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.14.0

provider/azappconfig/internal/maps/insert_test.go

@@ -62,8 +62,6 @@ func TestInsert(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

provider/azblob/blob_test.go

@@ -45,8 +45,6 @@ func TestBlob_Load(t *testing.T) {
 	t.Parallel()
 
 	for _, testcase := range testcases() {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 
@@ -77,8 +75,6 @@ func TestBlob_Watch(t *testing.T) {
 	t.Parallel()
 
 	for _, testcase := range append(testcases(), watchcases()...) {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

provider/azblob/go.mod

@@ -1,6 +1,6 @@
 module github.com/nil-go/konf/provider/azblob
 
-go 1.21
+go 1.22
 
 require (
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.14.0

provider/env/env_test.go

@@ -75,8 +75,6 @@ func TestEnv_Load(t *testing.T) {
 	t.Setenv("P.N", "")
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			values, err := env.New(testcase.opts...).Load()
 			assert.NoError(t, err)
@@ -105,8 +103,6 @@ func TestEnv_String(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

provider/file/file_test.go

@@ -61,8 +61,6 @@ func TestFile_Load(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			t.Parallel()
 

provider/file/go.mod

@@ -1,6 +1,6 @@
 module github.com/nil-go/konf/provider/file
 
-go 1.21
+go 1.22
 
 require github.com/fsnotify/fsnotify v1.7.0
 

provider/file/watch_test.go

@@ -44,8 +44,6 @@ func TestFile_Watch(t *testing.T) {
 	}
 
 	for _, testcase := range testcases {
-		testcase := testcase
-
 		t.Run(testcase.description, func(t *testing.T) {
 			tmpFile := path.Join(t.TempDir(), "watch.json")
 			assert.NoError(t, os.WriteFile(tmpFile, []byte(`{"p": {"k": "v"}}`), 0o600))