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This package is designed to help automate migration of feature flags from LaunchDarkly to Statsig. It fetches feature flags from LaunchDarkly, translates them into Statsig’s format, and creates corresponding feature gates in Statsig.

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Considerations

This script should work out of the box. It’s recommended you start with a test environment of 5-10 flags. However, before running the script on a large scale, consider the following:
  • IMPORTANT: If you don’t need to customize this import script, you can just use Statsig’s in-console tool
  • The script uses a tag Imported from LaunchDarkly to identify migrated flags in Statsig. Ensure this tag is unique and recognizable.
  • The script includes a function to delete all Statsig feature gates with a specific tag. Use this with caution to clean up after a test or failed migration.
  • The script requires API keys for both LaunchDarkly and Statsig, which should be kept secure.

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Installation

To run the script, you need Node.js and npm installed on your system. You can execute directly: 
npx @statsig/migrations --from launchdarkly --launchdarkly-project-id default <more-arguments>

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Configuration

  • Provide your LaunchDarkly API key and Statsig Console API key in the script
  • Map LaunchDarkly environments to Statsig environments that aren’t already the same by using --environment-name-mapping to the script.
  • Map LaunchDarkly context kind to Statsig’s custom unit ids and custom fields.
You can find the detailed instructions for these steps on the Github repo.

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Running the Script

To execute the migration script, run the following command in your terminal: 
node index.js
The script will perform the following actions:
  1. Fetch all feature flags from LaunchDarkly.
  2. Translate each flag into Statsig’s format.
  3. Create feature gates in Statsig.
  4. Write the migration status and details to a CSV file named flag_migration_tracker.csv

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Example Translations

The following examples show how LaunchDarkly feature flags are translated into Statsig feature gates: Example 1: LaunchDarkly flag with email and name targeting conditions
Example 1 - LaunchDarkly to Statsig translation
Example 2: LaunchDarkly flag with country-based targeting (off flag)
Example 2 - LaunchDarkly to Statsig translation

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Troubleshooting

If you encounter issues during the migration, check the following:
  • Ensure that the API keys are correct and have the necessary permissions.
  • Review the error messages in the console for clues on what might have gone wrong.
Pull requests and feedback welcome!
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