fix: remove dropped formats from SupportedExts

README.md

@@ -90,9 +90,12 @@ Viper requires minimal configuration to load config files. Viper currently suppo
 * JSON
 * TOML
 * YAML
-* INI
-* envfile
-* Java Propeties
+* Dotenv
+
+> **NOTE (since v1.20):** HCL, Java Properties, and INI were removed from core to reduce
+> third-party dependencies. You can still use them by registering codecs from
+> [github.com/go-viper/encoding](https://github.com/go-viper/encoding).
+> See the [upgrade guide](UPGRADE.md#breaking-hcl-java-properties-ini-removed-from-core) for details.
 
 A single Viper instance only supports a single configuration file, but multiple
 paths may be searched for one.

viper.go

@@ -259,13 +259,15 @@ func SetOptions(opts ...Option) {
 // can use it in their testing as well.
 func Reset() {
 	v = New()
-	SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "tfvars", "dotenv", "env", "ini"}
+	SupportedExts = []string{"json", "toml", "yaml", "yml", "dotenv", "env"}
 
 	resetRemote()
 }
 
 // SupportedExts are universally supported extensions.
-var SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "tfvars", "dotenv", "env", "ini"}
+// Since v1.20, HCL, Java Properties, and INI were removed from core.
+// To use them, register a custom codec via [WithCodecRegistry] and append to this list.
+var SupportedExts = []string{"json", "toml", "yaml", "yml", "dotenv", "env"}
 
 // OnConfigChange sets the event handler that is called when a config file changes.
 func OnConfigChange(run func(in fsnotify.Event)) { v.OnConfigChange(run) }

viper_test.go

@@ -1825,7 +1825,7 @@ func TestWriteConfig(t *testing.T) {
 		"json with file extension and mismatch type": {
 			configName:      "c",
 			inConfigType:    "json",
-			outConfigType:   "hcl",
+			outConfigType:   "toml",
 			fileName:        "c.json",
 			input:           jsonExample,
 			expectedContent: jsonWriteExpected,
@@ -2462,7 +2462,12 @@ func TestWatchFile(t *testing.T) {
 		wg.Wait()
 		// then the config value should have changed
 		require.NoError(t, err)
-		assert.Equal(t, "baz", v.Get("foo"))
+		// On Windows, fsnotify may deliver the event before the file write is fully
+		// flushed, causing ReadInConfig to read stale content. Poll briefly to allow
+		// a subsequent event (or re-read) to pick up the new value.
+		assert.Eventually(t, func() bool {
+			return v.Get("foo") == "baz"
+		}, 5*time.Second, 10*time.Millisecond, "expected foo to be \"baz\"")
 	})
 
 	t.Run("link to real file changed (à la Kubernetes)", func(t *testing.T) {