--output produces incorrect file name with --input files with .jsx suffix

Bublé version 0.14.2

$ cat abc.jsx 
var x = <Foo><Bar /></Foo>;

$ buble abc.jsx -o abc.js

Notice that the file ab.js was produced instead of the expected abc.js

$ cat abc.js
cat: abc.js: No such file or directory

$ cat ab.js 
var x = React.createElement( Foo, null, React.createElement( Bar, null ) );