README.md

Sveltekit SSR (Server Side Rendering)

This example shows how to use Lambda Web Adapter to run a server side rendered Sveltekit application on the managed nodejs runtime.

Add the Lambda Web Adapter layer to the function and configure the wrapper script.

attach Lambda Adapter layer to your function. This layer containers Lambda Adapter binary and a wrapper script.
1. x86_64: arn:aws:lambda:${AWS::Region}:753240598075:layer:LambdaAdapterLayerX86:24
2. arm64: arn:aws:lambda:${AWS::Region}:753240598075:layer:LambdaAdapterLayerArm64:24
configure Lambda environment variable AWS_LAMBDA_EXEC_WRAPPER to /opt/bootstrap. This is a wrapper script included in the layer.
set function handler to a startup command: run.sh. The wrapper script will execute this command to boot up your application.

To get more information of Wrapper script, please read Lambda documentation here.

* this example was created from the steps in this section. repeating them is not required

npx sv create app
1. select SvelteKit minimal option
2. select Yes, using Typescript syntax option
3. repeatedly select enter to complete sveltekit install with default options
cd app to switch current working directory to newly created app directory:
1. npm install --save-dev @sveltejs/adapter-node to install sveltekit node adapter
2. npm uninstall @sveltejs/adapter-auto to remove unused auto adapter
3. replace import adapter from '@sveltejs/adapter-auto'; with import adapter from '@sveltejs/adapter-node'; in svelte.config.js
4. add a run.sh wrapper script:
```
cat << EOF > ./run.sh
#!/bin/bash

node index.js
EOF
```

Run the following commands to build and deploy the application to lambda.

sam build --use-container
sam deploy --guided

When the deployment completes, take note of the SvelteKitSsrFunctionUrlEndpoint output value. This is the function URL.

Open function's URL in a browser to display the "Welcome to SvelteKit" page.