Conditional forceExclude of aws-sdk based on runtime version

.github/workflows/ci.yml

@@ -4,6 +4,7 @@
 name: CI
 
 on:
+  workflow_dispatch: {}
   push:
     branches: [ master ]
   pull_request:

README.md

@@ -449,7 +449,7 @@ The three options (`externals`, `forceExclude`, and `excludeFiles`) look similar
 
 - `forceExclude`
 
-  These packages are available in the Lambda runtime. Either by default (in the case of `aws-sdk`) or through a Lambda layer that you might be using. So these are not included in the Lambda package. And they are also marked as `externals`. Meaning that packages that are in `forceExclude` are automatically added to the `externals` list as well. By default, `aws-sdk` is listed in the `forceExclude`.
+  These packages are available in the Lambda runtime. Either by default (in the case of `aws-sdk`) or through a Lambda layer that you might be using. So these are not included in the Lambda package. And they are also marked as `externals`. Meaning that packages that are in `forceExclude` are automatically added to the `externals` list as well. By default, `aws-sdk` is listed in the `forceExclude` when `runtime` is lower than `nodejs18.x`.
 
 - `excludeFiles`
 

index.js

@@ -43,6 +43,15 @@ function applyWebpackOptions(custom, config) {
 function applyUserConfig(config, userConfig, servicePath, runtime) {
   config.servicePath = servicePath;
 
+  // Default to Node 12 if no runtime found
+  const runtimeVersion =
+    Number.parseInt((runtime || "").replace("nodejs", ""), 10) || 12;
+
+  // Force exclude aws-sdk for versions below Node 18
+  if (runtimeVersion < 18) {
+    config.options.forceExclude.push("aws-sdk");
+  }
+
   // Concat forceExclude if provided
   if (userConfig.forceExclude) {
     userConfig.forceExclude = config.options.forceExclude.concat(
@@ -66,9 +75,7 @@ function applyUserConfig(config, userConfig, servicePath, runtime) {
 
   Object.assign(config.options, userConfig);
 
-  // Default to Node 12 if no runtime found
-  config.nodeVersion =
-    Number.parseInt((runtime || "").replace("nodejs", ""), 10) || 12;
+  config.nodeVersion = runtimeVersion;
 }
 
 class ServerlessPlugin extends ServerlessWebpack {

src/config.js

@@ -20,8 +20,7 @@ module.exports = {
     packagerOptions: {},
     generateStatsFiles: false,
     tsConfig: "tsconfig.json",
-    // Exclude aws-sdk since it's available in the Lambda runtime
-    forceExclude: ["aws-sdk"],
+    forceExclude: [],
     disableForkTsChecker: false,
     // Set non Webpack compatible packages as externals
     // Or if we want to exclude all packages in the node_modules:

tests/force-exclude/force-exclude.test.js

@@ -13,3 +13,30 @@ test("force-exclude", async () => {
 
   expect(result).not.toMatch(errorRegex);
 });
+
+test("force-exclude package", async () => {
+  const result = await runSlsCommand(__dirname, "package -c serverless.yml");
+
+  expect(result).not.toMatch(errorRegex);
+
+  /*
+    Ensure that is-sorted and aws-sdk is excluded
+  */
+  expect(result).toMatch(
+    /Excluding external modules: is-sorted@\^[\d\\.]+, aws-sdk@\^[\d\\.]+\n/
+  );
+});
+
+test("force-exclude package (node18)", async () => {
+  const result = await runSlsCommand(
+    __dirname,
+    "package -c serverless.node18.yml"
+  );
+
+  expect(result).not.toMatch(errorRegex);
+
+  /*
+    Ensure that is-sorted is excluded
+  */
+  expect(result).toMatch(/Excluding external modules: is-sorted@\^[\d\\.]+\n/);
+});

tests/force-exclude/handler.js

@@ -1,6 +1,11 @@
 import sorted from "is-sorted";
+import AWS from "aws-sdk";
 
-export const hello = async (event, context) => {
+export const hello = async (event) => {
+  // Include a dummy AWS SDK call to ensure webpack attempts to bundle it
+  AWS.config.update({
+    region: "us-east-1",
+  });
   sorted([1, 2, 3]);
   return {
     statusCode: 200,

tests/force-exclude/package.json

@@ -10,6 +10,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "aws-sdk": "^2.1502.0",
     "is-sorted": "^1.0.5"
   }
 }

tests/force-exclude/serverless.node18.yml

@@ -0,0 +1,17 @@
+service: my-service
+
+plugins:
+  - '../../index'
+
+custom:
+  bundle:
+    forceExclude:
+      - "is-sorted"
+
+provider:
+  name: aws
+  runtime: nodejs18.x
+
+functions:
+  hello:
+    handler: handler.hello