old_contents: const {createVariableRule} = require('./lib/variable-rules')
  
  module.exports = createVariableRule('primer/box-shadow', {
    'box shadow': {
      expects: 'a box-shadow variable',
      props: 'box-shadow',
      values: ['$box-shadow*', 'none']
    }
  })
  
new_contents: const {createVariableRule} = require('./lib/variable-rules')
  
  module.exports = createVariableRule('primer/box-shadow', {
    'box shadow': {
      expects: 'a box-shadow variable',
      props: 'box-shadow',
      values: ['$box-shadow*', '$*-shadow', 'none'],
      singular: true
    }
  })
  
subject: allow $*-shadow variables in primer/box-shadow