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Library Module Format

A library module is a piece of reusable code provided by an extension that is emitted inside the Launch runtime library (the library that runs on the edge node). For example, a sendBeacon action type will have a library module that will run on the edge node and send a beacon.

The library module is structured as a CommonJS module. Within a CommonJS module, the following variables are available for usage:


A require function is available for you to access other modules within your extension. Any module in your extension can be accessed via a relative path. The relative path must begin with ./ or ../.

Example usage:

var transformHelper = require('../helpers/transform');
transformHelper.execute({a: 'b'});


A free variable named module is available which allows you to export the module’s API.

Example usage:

module.exports = () => {  }


A free variable named exports is available which allows you to export the module’s API.

Example usage:

exports.sayHello = () => {  }

This is an alternative to module.exports but is more limited in its usage. Please read Understanding module.exports and exports in node.js for a better understanding of the differences between module.exports and exports and the related caveats with using exports. When in doubt, make your life easier and use module.exports rather than exports.

Launch Server Side modules signature

All the modules types (data elements, conditions or actions) provided by the extensions will be called with the same parameters: context.

exports.sayHello = (context) => {  }