JSX automatic mode as default (#6552)

* JSX automatic mode as default

* changelog

* fix dead value

* revert unnecessary diff

Author: mununki

CHANGELOG.md

@@ -25,6 +25,7 @@
 #### :nail_care: Polish
 
 - Format docstrings. https://github.com/rescript-lang/rescript-compiler/pull/6417
+- JSX v4 automatic mode as the default mode https://github.com/rescript-lang/rescript-compiler/pull/6552
 
 # 11.0.0-rc.8
 

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/gentype/ImportPath.mli

@@ -3,7 +3,7 @@ open GenTypeCommon
 type t
 
 val bsCurryPath : config:Config.t -> t
-val chopExtensionSafe : t -> t
+val chopExtensionSafe : t -> t [@@live]
 val dump : t -> string
 val emit : t -> string
 val fromModule : dir:string -> importExtension:string -> ModuleName.t -> t

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 \