Simple example to show an issue when building a TS project with a local module being used as layer.
Build without using a container and it will error when attempting to copy the layer module from the scratch directory into .aws-sam/deps. Since the layer module was not copied into the scratch directory and the layer module is relative path within the theLambda.package.json the cp operation fails because the file doesn't exist.
sam build --beta-features --debug
2022-07-28 16:12:36,886 | Copying source file (/var/folders/ld/xqtng3g166n4w0vbv0g2y3q80000gp/T/tmpkj5q7uv7/node_modules/theLayer) to destination (.aws-sam/deps/3e01d3a7-fcb6-4a99-acd5-343427405b35/node_modules/theLayer)
2022-07-28 16:12:36,886 | NodejsNpmEsbuildBuilder:CopyDependencies raised unhandled exception
Traceback (most recent call last):
File "/opt/homebrew/Cellar/aws-sam-cli/1.53.0/libexec/lib/python3.8/site-packages/aws_lambda_builders/workflow.py", line 301, in run
action.execute()
File "/opt/homebrew/Cellar/aws-sam-cli/1.53.0/libexec/lib/python3.8/site-packages/aws_lambda_builders/actions.py", line 132, in execute
copytree(dependencies_source, new_destination)
File "/opt/homebrew/Cellar/aws-sam-cli/1.53.0/libexec/lib/python3.8/site-packages/aws_lambda_builders/utils.py", line 79, in copytree
shutil.copy2(new_source, new_destination)
File "/opt/homebrew/Cellar/[email protected]/3.8.13_1/Frameworks/Python.framework/Versions/3.8/lib/python3.8/shutil.py", line 435, in copy2
copyfile(src, dst, follow_symlinks=follow_symlinks)
File "/opt/homebrew/Cellar/[email protected]/3.8.13_1/Frameworks/Python.framework/Versions/3.8/lib/python3.8/shutil.py", line 264, in copyfile
with open(src, 'rb') as fsrc, open(dst, 'wb') as fdst:
FileNotFoundError: [Errno 2] No such file or directory: '/var/folders/ld/xqtng3g166n4w0vbv0g2y3q80000gp/T/tmpkj5q7uv7/node_modules/theLayer
The following will deploy the lambda and demonstrating it working correctly. Note that is using the --use-container flad within the sam build command.
sam build --use-container --beta-features
sam deploy
aws lambda invoke --function-name <funciton-name-from-output-of-stack> >(jq '.message') --invocation-type RequestResponse
'hello'