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We do not have any plans on supporting arbitrary Node.js modules on the Gateway due to any number of security vulnerability that could expose in addition to perofrmance and supportability concerns.
With that DataPower firmware implements GatewayScript with a modular approach. These modules or libraries can be loaded on demand by the application. This implementation supports an extendable system with a high degree of isolation between modules. GatewayScript supports the CommonJS 1.0 Module format. CommonJS 1.0 is the CommonJS specifications define programming interfaces that address how modules are written to be interoperable among systems. You can create custom modules by following the CommonJS specifications and can access custom modules based on precedence rules for require modules. If the module complies with the module specification, it loads and runs. Modules must also comply with the APIs and restrictions in the DataPower appliance. For example, a module cannot arbitrarily access the file system. Also IBM will not “support” any 3rd party libs if the issue is not related to DataPower.
So in summary the option here is to find a module that is CommonJS 1.0 compliant and import it with something like require('local:///path/to/file.js') and use it that way.
https://www.ibm.com/docs/en/datapower-gateway/10.5?topic=gateway-programming-model-gatewayscript