Module:If preview/configuration

 --[[
 We perform the actual check for whether this is a preview here since
 preprocessing is relatively expensive.
 ]]
 localframe=mw.getCurrentFrame()

 localfunctionis_preview()
 localrevision_id=frame:preprocess('{{REVISIONID}}')
 -- {{REVISIONID}} is usually the empty string when previewed.
 -- I don't know why we're checking for nil but hey, maybe someday things
 -- would have broken
 returnrevision_id==nilorrevision_id==''
 end

 localfunctiontemplatestyles()
 returnframe:extensionTag{
 name='templatestyles',args={src='Module:If preview/styles.css'}
 }
 end

 return{
 preview=is_preview(),
 templatestyles=templatestyles(),
 warning_infrastructure='%s<div class="preview-warning"><strong>Preview warning:</strong> %s</div>',
 missing_warning='The template has no warning text. Please add a warning.'
 }