use typescript and styled-jsx-plugin-postcss error.

[tungh]

Using styled-jsx-plugin-postcss error in typescript

warning.js?f60f4f0:33 Warning: Received `true` for non-boolean attribute `jsx`. If this is expected, cast the value to a string.
    in style (created by Unknown)
    in div (created by Unknown)
    in Unknown (created by Container)
    in AppContainer (created by Container)
    in Container (created by App)
    in div (created by App)
    in App

Your Environment

Tech	Version
next	latest
node	8.4
OS	mac
browser	chome
etc

[lukemorton]

Related to #2209

[jeffscottward]

@timneutkens / @lukemorton
How is this actually solved without depending on Universal Webpack?
Have this issue on our own build setup.