feat: adds noInstall option for Yarn packager

README.md

@@ -108,6 +108,7 @@ The following `esbuild` options are automatically set.
 | Option    | Description                                                                                           | Default     |
 | --------- | ----------------------------------------------------------------------------------------------------- | ----------- |
 | `scripts` | A string or array of scripts to be executed, currently only supports 'scripts' for npm, pnpm and yarn | `undefined` |
+| `noInstall` | [Yarn only] A boolean that deactivates the install step | `false` |
 
 #### Watch Options
 

package.json

@@ -107,4 +107,4 @@
   "engines": {
     "node": ">=14.18.0"
   }
-}
+}

src/index.ts

@@ -250,13 +250,15 @@ class EsbuildServerlessPlugin implements ServerlessPlugin {
       exclude: ['aws-sdk'],
       nativeZip: false,
       packager: 'npm',
+      packagerOptions: {
+        noInstall: false,
+      },
       installExtraArgs: [],
       watch: {
         pattern: './**/*.(js|ts)',
         ignore: [WORK_FOLDER, 'dist', 'node_modules', BUILD_FOLDER],
       },
       keepOutputDirectory: false,
-      packagerOptions: {},
       platform: 'node',
       outputFileExtension: '.js',
     };

src/pack-externals.ts

@@ -265,7 +265,7 @@ export async function packExternalModules(this: EsbuildServerlessPlugin) {
   assert(packageJsonPath, 'packageJsonPath is not defined');
 
   // Determine and create packager
-  const packager = await getPackager.call(this, this.buildOptions.packager);
+  const packager = await getPackager.call(this, this.buildOptions.packager, this.buildOptions.packagerOptions);
 
   // Fetch needed original package.json sections
   const sectionNames = packager.copyPackageSectionNames;

src/pack.ts

@@ -145,7 +145,7 @@ export async function pack(this: EsbuildServerlessPlugin) {
   assertIsString(this.buildOptions?.packager, 'packager is not a string');
 
   // 2) If individually is set, we'll optimize files and zip per-function
-  const packager = await getPackager.call(this, this.buildOptions.packager);
+  const packager = await getPackager.call(this, this.buildOptions.packager, this.buildOptions.packagerOptions);
 
   // get a list of every function bundle
   const { buildResults } = this;

src/packagers/index.ts

@@ -10,10 +10,10 @@ import { memoizeWith } from 'ramda';
 import { isPackagerId } from '../type-predicate';
 
 import type EsbuildServerlessPlugin from '../index';
-import type { PackagerId } from '../types';
+import type { PackagerId, PackagerOptions } from '../types';
 import type { Packager } from './packager';
 
-const packagerFactories: Record<PackagerId, () => Promise<Packager>> = {
+const packagerFactories: Record<PackagerId, (packgerOptions: PackagerOptions) => Promise<Packager>> = {
   async npm() {
     const { NPM } = await import('./npm');
 
@@ -24,10 +24,10 @@ const packagerFactories: Record<PackagerId, () => Promise<Packager>> = {
 
     return new Pnpm();
   },
-  async yarn() {
+  async yarn(packgerOptions) {
     const { Yarn } = await import('./yarn');
 
-    return new Yarn();
+    return new Yarn(packgerOptions);
   },
 };
 
@@ -40,7 +40,11 @@ const packagerFactories: Record<PackagerId, () => Promise<Packager>> = {
  */
 export const getPackager = memoizeWith(
   (packagerId) => packagerId,
-  async function (this: EsbuildServerlessPlugin, packagerId: PackagerId): Promise<Packager> {
+  async function (
+    this: EsbuildServerlessPlugin,
+    packagerId: PackagerId,
+    packgerOptions: PackagerOptions
+  ): Promise<Packager> {
     this.log.debug(`Trying to create packager: ${packagerId}`);
 
     if (!isPackagerId(packagerId)) {
@@ -49,7 +53,7 @@ export const getPackager = memoizeWith(
       throw new this.serverless.classes.Error(`Could not find packager '${packagerId}'`);
     }
 
-    const packager = await packagerFactories[packagerId]();
+    const packager = await packagerFactories[packagerId](packgerOptions);
 
     this.log.debug(`Packager created: ${packagerId}`);
 

src/packagers/yarn.ts

@@ -1,7 +1,7 @@
 import { any, isEmpty, reduce, replace, split, startsWith } from 'ramda';
 import { satisfies } from 'semver';
 
-import type { DependenciesResult, DependencyMap } from '../types';
+import type { DependenciesResult, DependencyMap, PackagerOptions } from '../types';
 import { SpawnError, spawnProcess } from '../utils';
 import type { Packager } from './packager';
 import { isString } from '../helper';
@@ -39,6 +39,12 @@ const getNameAndVersion = (name: string): { name: string; version: string } => {
  *   ignoreScripts (false) - Do not execute scripts during install
  */
 export class Yarn implements Packager {
+  private packagerOptions: PackagerOptions;
+
+  constructor(packagerOptions: PackagerOptions) {
+    this.packagerOptions = packagerOptions;
+  }
+
   get lockfileName() {
     return 'yarn.lock';
   }
@@ -220,6 +226,10 @@ export class Yarn implements Packager {
   }
 
   async install(cwd: string, extraArgs: Array<string>, useLockfile = true) {
+    if (this.packagerOptions.noInstall) {
+      return;
+    }
+
     const command = /^win/.test(process.platform) ? 'yarn.cmd' : 'yarn';
 
     const args = useLockfile

src/tests/packagers/index.test.ts

@@ -10,7 +10,7 @@ describe('getPackager()', () => {
   } as unknown as EsbuildServerlessPlugin;
 
   it('Returns a Packager instance', async () => {
-    const npm = await getPackager.call(mockPlugin, 'npm');
+    const npm = await getPackager.call(mockPlugin, 'npm', {});
 
     expect(npm).toEqual(expect.any(Object));
   });

src/tests/packagers/yarn.test.ts

@@ -6,7 +6,7 @@ import * as utils from '../../utils';
 
 jest.mock('process');
 describe('Yarn Packager', () => {
-  const yarn = new Yarn();
+  const yarn = new Yarn({});
   const path = './';
 
   let spawnSpy: jest.SpyInstance;
@@ -231,4 +231,13 @@ describe('Yarn Packager', () => {
 
     expect(result).toStrictEqual(expectedResult);
   });
+
+  it('should skip install if the noInstall option is true', async () => {
+    const yarnWithoutInstall = new Yarn({
+      noInstall: true,
+    });
+
+    await expect(yarnWithoutInstall.install(path, [], false)).resolves.toBeUndefined();
+    expect(spawnSpy).toBeCalledTimes(0);
+  });
 });

src/types.ts

@@ -13,6 +13,7 @@ export interface WatchConfiguration {
 
 export interface PackagerOptions {
   scripts?: string[] | string;
+  noInstall?: boolean;
 }
 
 interface NodeExternalsOptions {
@@ -24,14 +25,14 @@ export type EsbuildOptions = Omit<BuildOptions, 'watch' | 'plugins'>;
 export interface Configuration extends EsbuildOptions {
   concurrency?: number;
   packager: PackagerId;
+  packagerOptions: PackagerOptions;
   packagePath: string;
   exclude: '*' | string[];
   nativeZip: boolean;
   watch: WatchConfiguration;
   installExtraArgs: string[];
   plugins?: string | Plugin[];
   keepOutputDirectory?: boolean;
-  packagerOptions?: PackagerOptions;
   disableIncremental?: boolean;
   outputWorkFolder?: string;
   outputBuildFolder?: string;