make lambda work with API using bun layer

cdk.context.json

@@ -0,0 +1,5 @@
+{
+  "acknowledged-issue-numbers": [
+    29420
+  ]
+}

lambda/date.ts

@@ -0,0 +1,13 @@
+export default {
+    async handler(request: Request): Promise<Response | undefined> {
+        console.log(JSON.stringify(request));
+        const localeTime = new Date().toLocaleTimeString();
+        const response = JSON.stringify({ time: localeTime });
+        return new Response(response, {
+            status: 200,
+            headers: {
+                "content-type": "application/json; charset=UTF-8",
+            }
+        })
+    },
+  }

lib/bun-cdk-stack.ts

@@ -1,9 +1,8 @@
 import * as cdk from "aws-cdk-lib";
 import { LambdaIntegration, RestApi } from "aws-cdk-lib/aws-apigateway";
-import { LayerVersion, Runtime } from "aws-cdk-lib/aws-lambda";
-import { NodejsFunction } from "aws-cdk-lib/aws-lambda-nodejs";
+import { Code, LayerVersion, Runtime, Function, Architecture } from "aws-cdk-lib/aws-lambda";
 import { Construct } from "constructs";
-// import * as sqs from 'aws-cdk-lib/aws-sqs';
+import path = require("node:path");
 
 export class BunCdkStack extends cdk.Stack {
   constructor(scope: Construct, id: string, props?: cdk.StackProps) {
@@ -12,19 +11,35 @@ export class BunCdkStack extends cdk.Stack {
     const layer = LayerVersion.fromLayerVersionArn(
       this,
       "BunLayer",
+      // Follow https://github.com/oven-sh/bun/tree/main/packages/bun-lambda#setup
+      // and deploy the layer to your account
+      // then get the ARN from the AWS Console under Lambda -> Layers
       "arn:aws:lambda:us-east-1:648568751601:layer:bun:2"
     );
 
-    const nodejsFunction = new NodejsFunction(this, "BunCdkFunction", {
-      entry: "lambda/index.ts",
-      handler: "handler",
-      runtime: Runtime.NODEJS_20_X,
+    const helloHandler = new Function(this, "HelloFn", {
+      runtime: Runtime.PROVIDED_AL2,
+      handler: "hello.handler",
+      code: Code.fromAsset(path.join(__dirname, "../", "lambda")),
+      architecture: Architecture.ARM_64,
+      layers: [layer],
+    });
+
+    const dateHandler = new Function(this, "DateFn", {
+      runtime: Runtime.PROVIDED_AL2,
+      handler: "date.handler",
+      code: Code.fromAsset(path.join(__dirname, "../", "lambda")),
+      architecture: Architecture.ARM_64,
       layers: [layer],
     });
 
 
     const api = new RestApi(this, "bun-api");
-    api.root.addMethod("GET", new LambdaIntegration(nodejsFunction));
+    api.root.addMethod("GET", new LambdaIntegration(helloHandler));
+
+    const date = api.root.addResource("date");
+    date.addMethod("GET", new LambdaIntegration(dateHandler));
+
     new cdk.CfnOutput(this, "BunApiUrl", {
       value: api.url ?? "Something went wrong with the deployment",
     });

package.json

@@ -20,8 +20,10 @@
     "typescript": "~5.3.3"
   },
   "dependencies": {
+    "@types/aws-lambda": "^8.10.136",
     "@types/bun": "^1.0.8",
     "aws-cdk-lib": "2.132.0",
+    "aws-lambda": "^1.0.7",
     "bun": "^1.0.30",
     "bun-types": "^1.0.30",
     "constructs": "^10.0.0",