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JavaScript Lambda Functions Using a Bun Custom Runtime
- The Bun custom Lambda runtime offers an alternative to Node.js and Deno for Lambda functions, with features like ease of use and speed.
- Custom Lambda runtimes, like Bun, are distributed as Lambda Layers, built on Amazon Linux OS runtimes, and require specific APIs to work with Lambda service.
- Building and deploying the Bun Layer to AWS involves commands provided in the bun-lambda package's readme.
- When creating Lambda functions with Bun, adding the bun or bun-arm64 Lambda layer and returning a Response object from the handler is needed.
- Bun simplifies Lambda function creation with its built-in high-performance web server features, supporting WebSocket and Amazon API Gateway requests.
- Bun's custom runtime focuses on supporting integrations with API Gateway but also works with other event sources like SQS, SNS, S3, EventBridge, etc.
- Local testing with Bun can be done using the Bun server format, enabling running of the handler function locally.
- In testing speed, Bun Lambdas show competitive performance, with average execution times and cold starts compared to Node.js Lambdas.
- While there are significant speed differences between Node.js and Bun Lambdas, Bun offers good performance, ease of use, and compatibility with Node.js.
- Overall, Bun custom Lambda runtime provides a faster and developer-friendly alternative for building Lambda functions, suitable for production use.
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