const { init } = require('@wisersolutions/launchdarkly-node')

async function startApp() {
  await init('YOUR_LAUNCH_DARKLY_APP_KEY', options)
  // … launch the rest of your app
}

const { variation } = require('@wisersolutions/launchdarkly-node')

async function handleSomeRequest(context) {
  const user = getUserFrom(context)
  const isFeature1Enabled = await variation('some-boolean-flag-key', user)
  const feature2Variation = await variation('some-multi-variant-flag-key', user, 'default-variant')
  
  if (!isFeature1Enabled) return /* … */

  switch (feature2Variation) {
    case 'variant-one': return /* … */
    case 'variant-two': return /* … */
    case 'default-variant':
    default: return /* … */
  }
}