Make .jsx file extension not required by default

README.md

@@ -1,40 +1,39 @@
-vim-jsx
-=======
+# vim-jsx
 
-Syntax highlighting and indenting for JSX.  JSX is a JavaScript syntax
+Syntax highlighting and indenting for JSX. JSX is a JavaScript syntax
 transformer which translates inline XML document fragments into JavaScript
-objects.  It was developed by Facebook alongside [React][1].
+objects. It was developed by Facebook alongside [React][1].
 
 vim-jsx is _not_ a JavaScript syntax package, so in order to use it, you will
-also need to choose a base JS highlighter.  [pangloss/vim-javascript][2] is the
+also need to choose a base JS highlighter. [pangloss/vim-javascript][2] is the
 recommended package---it is vim-jsx's "official" dependency, and the only
-package against which it is regularly tested.  However, vim-jsx makes a best
+package against which it is regularly tested. However, vim-jsx makes a best
 effort to support other JavaScript syntax packages, including:
-- pangloss/vim-javascript
-- jelera/vim-javascript-syntax
-- othree/yajs
+
+* pangloss/vim-javascript
+* jelera/vim-javascript-syntax
+* othree/yajs
 
 Notably, the system vim JavaScript syntax is _not_ supported, due to its
-over-simplicity.  However, the system XML syntax package is an implicit
+over-simplicity. However, the system XML syntax package is an implicit
 dependency.
 
 Vim support for inline XML in JS is remarkably similar to the same for PHP,
 which you can find [here][3].
 
-Troubleshooting
----------------
+## Troubleshooting
 
 If you're experiencing incorrect highlighting or indenting in your JSX code,
 please file a GitHub issue which includes the following:
 
-- A brief affirmation that you've read the README and have installed one of the
+* A brief affirmation that you've read the README and have installed one of the
   supported dependencies (and the name of the one you're using).
 
-- A minimal ~/.vimrc which repros the issue you're having, as well as both a
+* A minimal ~/.vimrc which repros the issue you're having, as well as both a
   paste and a screenshot of the issue (a paste alone is insufficient, since it
-  doesn't illustrate the specific highlighting or indenting problem).  To
+  doesn't illustrate the specific highlighting or indenting problem). To
   obtain a minimal ~/.vimrc, simply bisect your ~/.vimrc by adding `finish` at
-  various points in the file.  (You can likewise bisect your included plugins
+  various points in the file. (You can likewise bisect your included plugins
   by selectively including only half of them, then a quarter, etc.).
 
 Most of the issues filed result from failures to install vim-javascript or
@@ -44,17 +43,17 @@ minimal comment.
 
 (Please feel free to disregard all this for feature requests.)
 
-Usage
------
+## Usage
 
-By default, JSX syntax highlighting and indenting will be enabled only for
-files with the `.jsx` extension.  If you would like JSX in `.js` files, add
+By default, JSX syntax highlighting and indenting will be enabled for all
+files with the `.js` or the `.jsx` extension.
+If you would like JSX only in `.jsx` files, add
 
 ```viml
-let g:jsx_ext_required = 0
+let g:jsx_ext_required = 1
 ```
 
-to your .vimrc or somewhere in your include path.  If you wish to restrict JSX
+to your .vimrc or somewhere in your include path. If you wish to restrict JSX
 to files with the pre-v0.12 `@jsx React.DOM` pragma, add
 
 ```viml
@@ -63,35 +62,33 @@ let g:jsx_pragma_required = 1
 
 to your .vimrc or somewhere in your include path.
 
-Frequently Asked Questions
---------------------------
+## Frequently Asked Questions
 
-- _How come syntax highlighting doesn't work at all?_
+* _How come syntax highlighting doesn't work at all?_
 
 This is the only question I'll answer with another question---Which do you
 think is more likely: (a) this package fails completely and utterly in serving
 its most fundamental purpose, or (b) user error?
 
-- _Why are my end tags colored differently than my start tags?_
+* _Why are my end tags colored differently than my start tags?_
 
 vim-jsx is basically the glue that holds JavaScript and XML syntax packages
-together in blissful harmony.  This means that any XML syntax defaults carry
+together in blissful harmony. This means that any XML syntax defaults carry
 over to the XML portions of vim, and it's common for many colorschemes to
 highlight start and end tags differently due to the system XML syntax defaults.
 
-- _Syntax highlighting seems to work, but breaks highlighting and indenting
-  further down in the file.  What's wrong?_
+* _Syntax highlighting seems to work, but breaks highlighting and indenting
+  further down in the file. What's wrong?_
 
 This often results from trying to enable XML folding in one's `~/.vimrc` (i.e.,
-via `let g:xml_syntax_folding = 1`).  vim-jsx does not support syntax folding,
+via `let g:xml_syntax_folding = 1`). vim-jsx does not support syntax folding,
 and is not tested with either JavaScript or XML folding enabled.
 
-Installation
-------------
+## Installation
 
 ### Pathogen
 
-The recommended installation method is via [Pathogen][4].  Then simply execute
+The recommended installation method is via [Pathogen][4]. Then simply execute
 
     git clone https://github.com/mxw/vim-jsx.git ~/.vim/bundle/vim-jsx
 
@@ -121,17 +118,16 @@ If you have no `~/.vim/after` directory, you can download the tarball or zip
 and copy the contents to `~/.vim`.
 
 If you have existing `~/.vim/after` files, copy the syntax and indent files
-directly into their respective destinations.  If you have existing after syntax
+directly into their respective destinations. If you have existing after syntax
 or indent files for Javascript, you'll probably want to do something like
 
     mkdir -p ~/.vim/after/syntax/javascript
     cp path/to/vim-jsx/after/syntax/jsx.vim ~/.vim/after/syntax/javascript/jsx.vim
     mkdir -p ~/.vim/after/indent/javascript
     cp path/to/vim-jsx/after/indent/jsx.vim ~/.vim/after/indent/javascript/jsx.vim
 
-
-[1]: http://facebook.github.io/react/           "React"
+[1]: http://facebook.github.io/react/ "React"
 [2]: https://github.com/pangloss/vim-javascript "pangloss: vim-javascript"
-[3]: https://github.com/mxw/vim-xhp             "mxw: vim-xhp"
-[4]: https://github.com/tpope/vim-pathogen      "tpope: vim-pathogen"
-[5]: https://github.com/VundleVim/Vundle.vim    "VundleVim: Vundle.vim"
+[3]: https://github.com/mxw/vim-xhp "mxw: vim-xhp"
+[4]: https://github.com/tpope/vim-pathogen "tpope: vim-pathogen"
+[5]: https://github.com/VundleVim/Vundle.vim "VundleVim: Vundle.vim"

ftdetect/javascript.vim

@@ -8,7 +8,7 @@
 
 " Whether the .jsx extension is required.
 if !exists('g:jsx_ext_required')
-  let g:jsx_ext_required = 1
+  let g:jsx_ext_required = 0
 endif
 
 " Whether the @jsx pragma is required.