A while back, a client asked me “how can I share business logic between services in a Node.js monorepo?”. So here it is!

Encapsulate the shared business logic into modules, and put them in a separate folder.

In the Lambda handler functions, reference the shared modules using relative paths.

Use webpack to resolve and bundle them into the deployment package. If you use the Serverless framework, then check out the serverless-webpackplugin. For example:

Deploy every service on every commit.You can do this with a simple script like the following.

To see how everything fits together, check out this demo repo. It has CI/CD set up already through drone.io and you can see a recent deployment of all the services in the monorepo here.

But wait! How do I choose between having a monorepo vs a repo per service?

Don’t worry, I’ve got you covered for that too ;-) You can read about my thoughts on the two approaches here.

Hi, my name is Yan Cui. I’m an AWS Serverless Hero and the author of Production-Ready Serverless. I have run production workload at scale in AWS for nearly 10 years and I have been an architect or principal engineer with a variety of industries ranging from banking, e-commerce, sports streaming to mobile gaming. I currently work as an independent consultant focused on AWS and serverless.

You can contact me via Email, Twitter and LinkedIn.

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Originally published at https://theburningmonk.com on June 29, 2019.

Hackernoon Archive June 30th, 2019

AWS Lambda: how to share code in a monorepo

@theburningmonkYan Cui

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