NextJS Image Optimizer Handler

This is a wrapper for next/server/image-optimizer allowing to use S3.

It is intended to be used with nextjs deployments to Lambda.

Usage

Create new lambda function with NODE_16 runtime in AWS. Use

const sharpLayer: LayerVersion
const assetsBucket: Bucket

const code = require.resolve('@sladg/nextjs-image-optimizer-handler/zip')

const imageOptimizerFn = new Function(this, 'LambdaFunction', {
      code: Code.fromAsset(code),
      runtime: Runtime.NODEJS_16_X,
      handler: 'index.handler',
      layers: [sharpLayer],
      memorySize: 1024,
      timeout: Duration.seconds(15),
      environment: {
        S3_BUCKET_SOURCE: assetsBucket.bucketName
      }
    })

Lambda consumes Api Gateway requests, so we need to create ApiGw proxy (v2) that will trigger Lambda.

Lambda is designed to serve _next/image* route in NextJS stack and replaces the default handler so we can optimize caching and memory limits for page renders and image optimization.

Sharp

Besides handler (wrapper) itself, underlying NextJS also requires sharp binaries. To build those, we use npm install with some extra parametes. Then we zip all sharp dependencies and compress it to easily importable zip file.

const code = require.resolve('@sladg/nextjs-image-optimizer-handler/sharp-layer')

const sharpLayer = new LayerVersion(this, 'SharpLayer', {
  code: Code.fromAsset(code)
})

Notes

This is part of NextJS to Lambda deployment process. More info to follow.