function performance(performanceBudget) {
  return (context, util) =>
    util.merge({
      performance: performanceBudget
    })
}
@param {object} performanceBudget
@param {number} performanceBudget.maxAssetSize
@param {number} performanceBudget.maxEntrypointSize
@param {string} performanceBudget.hints              'warning' or 'error'