Update default runtime to Nodejs 24

.changeset/default-nodejs24.md

@@ -0,0 +1,5 @@
+---
+"sst": patch
+---
+
+Change the default Lambda runtime to `nodejs24.x` for all function-based constructs.

packages/sst/src/constructs/EdgeFunction.ts

@@ -108,7 +108,7 @@ export class EdgeFunction extends Construct {
     this.scope = props.scopeOverride || this;
 
     this.props = {
-      runtime: "nodejs18.x",
+      runtime: "nodejs24.x",
       timeout: 10,
       memorySize: 1024,
       ...props,

packages/sst/src/constructs/Function.ts

@@ -228,7 +228,7 @@ export interface FunctionProps
   handler?: string;
   /**
    * The runtime environment for the function.
-   * @default "nodejs22.x"
+   * @default "nodejs24.x"
    * @example
    * ```js
    * new Function(stack, "Function", {
@@ -880,7 +880,7 @@ export class Function extends CDKFunction implements SSTConstruct {
       .forEach((per) => {
         props = Function.mergeProps(per, props);
       });
-    props.runtime = props.runtime || "nodejs22.x";
+    props.runtime = props.runtime || "nodejs24.x";
     if (props.runtime === "go1.x") useWarning().add("go.deprecated");
 
     // Set defaults

packages/sst/src/constructs/Job.ts

@@ -141,7 +141,7 @@ export interface JobProps {
   architecture?: "x86_64" | "arm_64";
   /**
    * The runtime environment for the job.
-   * @default "nodejs18.x"
+   * @default "nodejs24.x"
    * @example
    * ```js
    * new Job(stack, "MyJob", {
@@ -665,7 +665,7 @@ export class Job extends Construct implements SSTConstruct {
       };
       const image = LinuxBuildImage.fromDockerRegistry(
         // ARM images can be found here https://hub.docker.com/r/amazon/aws-lambda-nodejs
-        dockerImageMap[architecture ?? "x86_64"][runtime ?? "nodejs18.x"]
+        dockerImageMap[architecture ?? "x86_64"][runtime ?? "nodejs24.x"]
       );
       project.environment = {
         ...project.environment,
@@ -804,6 +804,6 @@ export class Job extends Construct implements SSTConstruct {
 
   private convertJobRuntimeToFunctionRuntime() {
     const { runtime } = this.props;
-    return runtime === "container" ? "container" : "nodejs18.x";
+    return runtime === "container" ? "container" : "nodejs24.x";
   }
 }

packages/sst/src/constructs/NextjsSite.ts

@@ -272,7 +272,7 @@ export class NextjsSite extends SsrSite {
         ...baseServerConfig,
         handler: fn.handler,
         bundle: path.join(sitePath, fn.bundle),
-        runtime: this.props.runtime ?? ("nodejs18.x" as const),
+        runtime: this.props.runtime ?? ("nodejs24.x" as const),
         architecture: Architecture.ARM_64,
         memorySize: this.props.memorySize ?? 1536,
         environment: {
@@ -311,7 +311,7 @@ export class NextjsSite extends SsrSite {
       function: {
         handler: fn.handler,
         bundle: path.join(sitePath, fn.bundle),
-        runtime: "nodejs18.x" as const,
+        runtime: "nodejs24.x" as const,
         memorySize: 1024,
         environment: {
           ...environment,

packages/sst/src/constructs/SsrSite.ts

@@ -1253,7 +1253,7 @@ function handler(event) {
         singletonUrlSigner ??
         new EdgeFunction(self, "ServerUrlSigningFunction", {
           bundle: path.join(__dirname, "../support/signing-function"),
-          runtime: "nodejs18.x",
+          runtime: "nodejs24.x",
           handler: "index.handler",
           timeout: 10,
           memorySize: 128,

packages/sst/src/constructs/Stack.ts

@@ -95,7 +95,7 @@ export class Stack extends CDKStack {
    * ```js
    * stack.setDefaultFunctionProps({
    *   srcPath: "backend",
-   *   runtime: "nodejs18.x",
+   *   runtime: "nodejs24.x",
    * });
    * ```
    */

packages/sst/src/constructs/deprecated/NextjsSite.ts

@@ -118,12 +118,12 @@ export interface NextjsSiteProps {
       permissions?: Permissions;
       /**
        * The runtime environment.
-       * @default "nodejs18.x"
+       * @default "nodejs24.x"
        * @example
        * ```js
        * new Function(stack, "Function", {
        *   path: "path/to/site",
-       *   runtime: "nodejs18.x",
+       *   runtime: "nodejs24.x",
        * })
        *```
        */
@@ -1504,7 +1504,7 @@ export class NextjsSite extends Construct implements SSTConstruct {
     if (runtime === "nodejs20.x") {
       return lambda.Runtime.NODEJS_20_X;
     }
-    return lambda.Runtime.NODEJS_18_X;
+    return lambda.Runtime.NODEJS_24_X;
   }
 }
 

packages/sst/test/constructs/Function.test.ts

@@ -70,6 +70,18 @@ test("constructor: props with minimum config", async () => {
   countResources(stack, "AWS::Lambda::EventInvokeConfig", 0);
 });
 
+test("constructor: default runtime", async () => {
+  const app = await createApp();
+  const stack = new Stack(app, "stack");
+  new Function(stack, "Function", {
+    handler: "test/constructs/lambda.handler",
+  });
+  await app.finish();
+  hasResource(stack, "AWS::Lambda::Function", {
+    Runtime: "nodejs24.x",
+  });
+});
+
 test("constructor: props with full config", async () => {
   const stack = new Stack(await createApp(), "stack");
   new Function(stack, "Function", {

packages/sst/test/constructs/Job.test.ts

@@ -52,7 +52,7 @@ test("constructor: default", async () => {
           Value: "/test/test/",
         }),
       ],
-      Image: "amazon/aws-lambda-nodejs:18",
+      Image: "amazon/aws-lambda-nodejs:24",
       Type: "LINUX_CONTAINER",
     },
     TimeoutInMinutes: 480,