Create a new folder in functions directory with the actual lambda function name.
This new folder should contain two file:
index.js (the actual lambda function code that contains the handler function)
run.js (the lambda function will be executed in this file with valid mock data. Mock data for custom services can be generated from the lambda custom test configuration page)
Adding a new package dependency
Add the new package in layers/nodejs/package.json file
Run npm install
Zip the nodejs folder
Create a new version of the layer and then activate the new version for lambdas
Good to know
Use commonjs patterns
If a package has native binary dependencies then deploy the code in a aws linux docker container.