faastjs.commonoptions.usedependencycaching.md

id	title	hide_title
faastjs.commonoptions.usedependencycaching	CommonOptions.useDependencyCaching property	true

faastjs > CommonOptions > useDependencyCaching

CommonOptions.useDependencyCaching property

Cache installed dependencies from CommonOptions.packageJson. Only applies to AWS. Default: true.

Signature:

useDependencyCaching?: boolean;

Remarks

If useDependencyCaching is true, The resulting node_modules folder is cached in a Lambda Layer with the name faast-${key}, where key is the SHA1 hash of the packageJson contents. These cache entries are removed by garbage collection, by default after 24h. Using caching reduces the need to install and upload dependencies every time a function is created. This is important for AWS because it creates an entirely separate lambda function to install dependencies remotely, which can substantially increase function deployment time.

If useDependencyCaching is false, the lambda layer is created with the same name as the lambda function, and then is deleted when cleanup is run.