launchdarkly-node

LaunchDarkly server-side SDK wrapper for Node intended to provide a modern API and enforce best practices.

Use

Init connection to LaunchDarkly when launching your app with

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

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

Then request a feature variation anywhere in your app with

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 /* … */
  }
}

See SDK docs for argument details.

Development

Install

Install dependencies using:

npm install

Develop

After you modify sources, run the following (or set up your IDE to do it for you):

• format the code using npm run format
• lint it using npm run lint
• test it using npm test

and fix the errors, if there are any.

Publish

Publishing is done in two steps:

1. Create a new version tag and push it to the repository:

   npm version <patch|minor|major>
   git push --follow-tags

2. Build and publish the new version as a npm package:

   npm publish --access public