code: function buildClassNamePropFunction(t, cssObject, keyAliases) {
      var objectProperties =
          Object.keys(cssObject).map(key => {
              var value = cssObject[key]
  
              if (!isNaN(key)) {
                  key = `@media screen and (min-width: ${key}px)`
              }
              else if (key in keyAliases) {
                  key = keyAliases[key]
              }
  
              return t.objectProperty(
                      t.identifier(key),
                      value,
                  )
              }
          )
  
      return t.jSXAttribute(
          t.jSXIdentifier('className'),
          t.jSXExpressionContainer(
              t.callExpression(
                  t.identifier('css'),
                  [
                      t.objectExpression(objectProperties)
                  ]
              )
          )
      )
  }
docs: /*
  export function buildClassNamePropFunction(t, cssObject) {
  return t.jSXAttribute(
  t.jSXIdentifier('className'),
  t.jSXExpressionContainer(
  t.callExpression(
  t.identifier('css'),
  [
  cssObject
  ]
  )
  )
  )
  }