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AWS Lambda rejects deployment packages larger than 250 MB once unzipped. osls zipped and uploaded such packages anyway, and the deployment only failed minutes later, when CloudFormation created the function: "Unzipped size must be smaller than 262144000 bytes". Add up the size of the files before zipping them and fail right away, listing the largest top-level files and directories of the package and pointing to `package.patterns`. This applies to service, function and layer packages, for both `package` and `deploy`. The check is skipped when a plugin overrides getFileContent() or getFileContentAndStat(), as the zipped content can then differ from the files on disk. Layers also count toward the limit, but the unzipped size of external layers is not known locally: only packages that are too large on their own are rejected. Claude-Session: https://claude.ai/code/session_01Awk33iZ9mDSg1xgSAPkgGK
mnapoli
marked this pull request as draft
September 27, 2026 10:15
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Backport of #459 to 3.x: same change, with the docs link pointing to the 3.x packaging guide.
Tested the same way.
npm testpasses (3511 tests, the only failure is an uncaughtgetRandomValueserror on Node 26 that also happens without this change). The packaging integration tests and the large zip smoke test pass. On the real 305 MB service,serverless deployfails in under a second with the new message, and a normal-size service still packages.