global.installComponents = function (component, components) {
  var options = typeof component.exports === 'function'
    ? component.exports.extendOptions
    : component.options

  if (typeof component.exports === 'function') {
    options.components = component.exports.options.components
  }

  options.components = options.components || {}

  for (var i in components) {
    options.components[i] = options.components[i] || components[i]
  }


  if (options.functional) {
    provideFunctionalComponents(component, options.components)
  }
}

var functionalPatchKey = '_functionalComponents'

function provideFunctionalComponents(component, components) {
  if (component.exports[functionalPatchKey]) {
    return
  }
  component.exports[functionalPatchKey] = true

  var render = component.exports.render
  component.exports.render = function (h, vm) {
    return render(h, Object.assign({}, vm, {
      _c: function (n, a, b) {
        return vm._c(components[n] || n, a, b)
      }
    }))
  }
}