feat(config): exclude option

add extra option excluding external module from the deployment package

closes #23

README.md

@@ -39,8 +39,8 @@ custom:
     minify: false
 ```
 
-The `aws-sdk` module is exluded from bundle by default, and you can exclude additional dependencies using `external` option. 
 Check [esbuild](https://github.com/evanw/esbuild#command-line-usage) documentation for the full list of available options. Note that some options like `entryPoints` or `outdir` cannot be overwritten.
+The package specified in the `exclude` option is passed to esbuild as `external`, but it is not included in the function bundle either. The default value for this option is `['aws-sdk']`.
 
 See [example folder](example) for a minimal example.
 

src/index.ts

@@ -18,14 +18,16 @@ interface ServiceExtended extends Service {
   functions?: Record<string, Serverless.FunctionDefinition>;
 }
 
-interface Configuration extends BuildOptions {
+export interface Configuration extends BuildOptions {
   packager: 'npm' | 'yarn';
+  exclude: string[];
 }
 
 const DEFAULT_BUILD_OPTIONS: Partial<Configuration> = {
   bundle: true,
   target: 'es2017',
-  external: ['aws-sdk'],
+  external: [],
+  exclude: ['aws-sdk'],
   packager: 'npm',
 };
 
@@ -132,6 +134,10 @@ export class EsbuildPlugin implements Plugin {
     await Promise.all(this.rootFileNames.map(entry => {
       const config: BuildOptions = {
         ...this.buildOptions,
+        external: [
+          ...this.buildOptions.external,
+          ...this.buildOptions.exclude,
+        ],
         entryPoints: [entry],
         outdir: path.join(this.originalServicePath, BUILD_FOLDER, path.dirname(entry)),
         platform: 'node',

src/packExternalModules.ts

@@ -142,7 +142,7 @@ function getProdModules(externalModules: { external: string }[], packagePath: st
  * and performance.
  */
 export async function packExternalModules() {
-  const externals = without(['aws-sdk'], this.buildOptions.external);
+  const externals = without(this.buildOptions.exclude, this.buildOptions.external);
 
   if (!externals) {
     return;