(docs): nodejs-function, document how to disable bundling for tests

[nbaillie]

Create an option to disable, (or automatically disable?) asset build/bundling, when using Jest to instantiate a cdk-pipeline for tests

Use Case

When using a pipeline instance in jest it causes the assets to build/bundle, it may be the intention of the test to check only that the pipeline is correctly formed, build/bundle testing may be handled else where.
In this case the build/bundle process creates additional time delay on testing in synth stage of the pipeline.

Proposed Solution

Create an option to disable, (or automatically disable?) asset build/bundling, when using Jest to instantiate a cdk-pipeline for tests

Other

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

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This is a 🚀 Feature Request

[rix0rrr]

I believe there's an context value you can set to stop bundling (or more accurately, pick the stacks for which you want to enable bundling, which in your case would be none):

aws-cdk/packages/@aws-cdk/core/lib/asset-staging.ts

Line 163 in 6de792c

const bundlingStacks: string[] = this.node.tryGetContext(cxapi.BUNDLING_STACKS) ?? ['*'];

aws-cdk/packages/@aws-cdk/cx-api/lib/app.ts

Line 45 in c84217f

export const BUNDLING_STACKS = 'aws:cdk:bundling-stacks';

[rix0rrr]

I'm assuming you're using NodeJSFunction or PythonFunction in your pipeline...

[nbaillie]

Thanks for the info above, I think this will help.

Yes using NodeJSFunction but another use case would be with s3-deploy.

[anthonygerrard]

I have a project which uses s3deployment bundling. I tried setting this context attribute in its tests but it led to build failures.

[bracki]

@rix0rrr Can you clarify what exactly needs to be done to disable this? I tried to do this programatically, but it seems the context variable can't be set at runtime? Do I need a separate cdk.json just for testing? That seems unfortunate.

[bracki]

#18125 has some answers. #18125 (comment)