JSX automatic mode as default

Author: mununki

docs/JSXV4.md

@@ -43,7 +43,7 @@ Another example is a V4 project that also uses `"rescript-react-native", "rescri
 
 ### Classic and Automatic Mode
 
-Classic mode is the default and generates calls to `React.createElement` just as with V3.
+Classic mode generates calls to `React.createElement` just as with V3.
 
 ```json
 "jsx": {
@@ -52,7 +52,7 @@ Classic mode is the default and generates calls to `React.createElement` just as
 }
 ```
 
-Automatic mode is an experimental mode that generate calls to `_jsx` functions (similar to TypeScript's `react-jsx` mode)
+Automatic mode is the default and generates calls to `_jsx` functions (similar to TypeScript's `react-jsx` mode)
 
 ```json
 "jsx": {

jscomp/common/js_config.ml

@@ -51,7 +51,7 @@ let force_cmi = ref false
 let force_cmj = ref false
 let jsx_version = ref None
 let jsx_module = ref React
-let jsx_mode = ref Classic
+let jsx_mode = ref Automatic
 let js_stdout = ref true
 let all_module_aliases = ref false
 let no_stdlib = ref false

jscomp/others/belt_HashSetInt.resi

@@ -23,12 +23,12 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
 
 /***
-This module is [`Belt.HashSet`]() specialized with key type to be a primitive type.
+  This module is [`Belt.HashSet`]() specialized with key type to be a primitive type.
 
-It is more efficient in general, the  API is the same with [`Belt.HashSet`]() except its key type is fixed,
-and identity is not needed(using the built-in one)
+  It is more efficient in general, the  API is the same with [`Belt.HashSet`]() except its key type is fixed,
+  and identity is not needed(using the built-in one)
 
-**See** [`Belt.HashSet`]()
+  **See** [`Belt.HashSet`]()
 */
 
 type key = int

jscomp/others/belt_HashSetString.resi

@@ -23,12 +23,12 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
 
 /***
-This module is [`Belt.HashSet`]() specialized with key type to be a primitive type.
+  This module is [`Belt.HashSet`]() specialized with key type to be a primitive type.
 
-It is more efficient in general, the  API is the same with [`Belt.HashSet`]() except its key type is fixed,
-and identity is not needed(using the built-in one)
+  It is more efficient in general, the  API is the same with [`Belt.HashSet`]() except its key type is fixed,
+  and identity is not needed(using the built-in one)
 
-**See** [`Belt.HashSet`]()
+  **See** [`Belt.HashSet`]()
 */
 
 type key = string

jscomp/syntax/cli/res_cli.ml

@@ -177,7 +177,7 @@ end = struct
   let interface = ref false
   let jsxVersion = ref (-1)
   let jsxModule = ref "react"
-  let jsxMode = ref "classic"
+  let jsxMode = ref "automatic"
   let file = ref ""
   let typechecker = ref false
 
@@ -215,7 +215,7 @@ end = struct
         "Specify the jsx module. Default: react" );
       ( "-jsx-mode",
         Arg.String (fun txt -> jsxMode := txt),
-        "Specify the jsx mode, classic or automatic. Default: classic" );
+        "Specify the jsx mode, classic or automatic. Default: automatic" );
       ( "-typechecker",
         Arg.Unit (fun () -> typechecker := true),
         "Parses the ast as it would be passed to the typechecker and not the \