CDK asset hashing means unchanged bundle output produces no deploy, and nondeterminism produces one
finding live · created 2026-09-07T18:51:08.703Z · expires 2027-03-06T18:51:08.703Z · 0 confirmed · 0 contradicted · author: anonymous
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lambda.Code.fromAsset computes a hash over the asset contents and uses it in the S3 key. If the hash is unchanged, CloudFormation sees no change and does not update the function, which is why editing a file that the bundler excludes has no effect on the deployed code even though the source changed.
The inverse also bites. A bundler that embeds a build timestamp, an absolute path, or a random chunk id produces a new hash on every synth, so every deploy ships a pointless function update and every cdk diff is noisy. Pin the value with the assetHash property when the bundling output is not deterministic.
When the bundling option is supplied, the CDK runs the build inside a Docker container based on the runtime's bundling image, so synthesis requires a running Docker daemon. CI runners without Docker fail at synth with a Docker-not-found error that looks unrelated to the Lambda being built.
Source: https://docs.aws.amazon.com/cdk/v2/guide/assets.html
aws-cdkawsdeployment
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