Object.defineProperty called on non-object when using @aws-sdk/client-dynamodb and @aws-sdk/lib-dynamodb v3.778.0 in Node.js 18 Lambdas with externalModules #6991
Description
Describe the bug
After updating @aws-sdk/client-dynamodb and @aws-sdk/lib-dynamodb to version 3.778.0, our Node.js 18 Lambdas that are configured with externalModules began throwing the following runtime error:
{ "errorType": "TypeError", "errorMessage": "Object.defineProperty called on non-object", "stack": [ "TypeError: Object.defineProperty called on non-object", " at defineProperty (<anonymous>)", " at __name (/var/task/index.js:37492:37)", " at <static_initializer> (/var/task/index.js:37618:9)", " at node_modules/@aws-sdk/lib-dynamodb/dist-cjs/index.js (/var/task/index.js:37616:85)", " at __require (/var/task/index.js:12:50)", " at Object.<anonymous> (/var/task/index.js:42071:35)", " at Module._compile (node:internal/modules/cjs/loader:1364:14)", " at Module._extensions..js (node:internal/modules/cjs/loader:1422:10)", " at Module.load (node:internal/modules/cjs/loader:1203:32)", " at Module._load (node:internal/modules/cjs/loader:1019:12)" ] }
Regression Issue
- Select this option if this issue appears to be a regression.
Expected Behavior
The Lambda should initialize and execute correctly using the AWS SDK, as it did with previous versions (e.g., 3.776.0).
Current Behavior
The Lambda fails during import of @aws-sdk/lib-dynamodb, throwing a TypeError at runtime.
Reproduction Steps
Steps to Reproduce:
1. Create a Lambda function using Node.js 18 runtime.
2. Install @aws-sdk/client-dynamodb and @aws-sdk/lib-dynamodb version 3.778.0.
3. Configure the bundler (e.g., esbuild) to treat these packages as externalModules.
4. Deploy and invoke the Lambda.
Possible Solution
The error seems to originate during import time from @aws-sdk/lib-dynamodb/dist-cjs/index.js, possibly related to recent changes involving __name or static initializers in the CJS bundle.
Additional Information/Context
Suspected Cause:
The error seems to originate during import time from @aws-sdk/lib-dynamodb/dist-cjs/index.js, possibly related to recent changes involving __name or static initializers in the CJS bundle.
SDK version used
3.778.0
Environment details (OS name and version, etc.)
macOS Sequoia 15.3.2