support for --jsx flags

[prabirshrestha]

It would be great to have support for --jsx flags. microsoft/TypeScript#3564

{ test: /\.ts$/, loader: 'ts-loader?jsx=KIND' }

where KIND is preserve or react

[jbrantly]

Support for specifying the jsx option in the tsconfig.json file is already included in that PR. Using tsconfig.json is the preferred (and only) way to specify TypeScript-related options with this loader. Basically you'll be able to specify the jsx option without any changes to ts-loader once that lands.

[jbrantly]

Just for reference, I've created a JSX test that shows how to set the option in the tsconfig.json file.