fix(rollup-plugin): add default modules back (#5234)

* fix(rollup-plugin): resolve default modules

* test(rollup-plugin): fix lwc-modules test

* test(rollup-plugin): add test for overriding defaultModules

* chore: improve test descriptions

* Update packages/@lwc/rollup-plugin/src/index.ts

Co-authored-by: Will Harney <[email protected]>

---------

Co-authored-by: Will Harney <[email protected]>

Author: cardoso

packages/@lwc/rollup-plugin/src/__tests__/resolver/resolver.spec.ts

@@ -10,20 +10,24 @@ import { describe, it, expect } from 'vitest';
 import { rollup, type RollupLog, type Plugin, type RollupBuild } from 'rollup';
 import nodeResolve from '@rollup/plugin-node-resolve';
 
-import lwc from '../../index';
+import lwc, { type RollupLwcOptions } from '../../index';
 
 const fixturesdir = path.resolve(__dirname, 'fixtures');
 
 async function runRollup(
     pathname: string,
-    { plugins = [] as Plugin[] } = {}
+    {
+        plugins = [] as Plugin[],
+        external = ['lwc', '@lwc/synthetic-shadow', '@lwc/wire-service'],
+        options = undefined as RollupLwcOptions | undefined,
+    } = {}
 ): Promise<{ bundle: RollupBuild; warnings: RollupLog[] }> {
     const warnings: RollupLog[] = [];
 
     const bundle = await rollup({
         input: path.resolve(fixturesdir, pathname),
-        plugins: [lwc(), ...plugins],
-        external: ['lwc', '@lwc/synthetic-shadow', '@lwc/wire-service'],
+        plugins: [lwc(options), ...plugins],
+        external,
         onwarn(warning) {
             warnings.push(warning);
         },
@@ -36,9 +40,19 @@ async function runRollup(
 }
 
 describe('resolver', () => {
-    it('should be capable to resolve all the base LWC module imports', async () => {
-        const { warnings } = await runRollup('lwc-modules/lwc-modules.js');
+    it('should be capable to resolve all the base LWC module imports without @rollup/plugin-node-resolve', async () => {
+        const { warnings } = await runRollup('lwc-modules/lwc-modules.js', { external: [] });
+        expect(warnings).toHaveLength(0);
+    });
 
+    it('should be capable to resolve all the base LWC modules using @rollup/plugin-node-resolve', async () => {
+        const { warnings } = await runRollup('lwc-modules/lwc-modules.js', {
+            external: [],
+            plugins: [nodeResolve()],
+            options: {
+                defaultModules: [],
+            },
+        });
         expect(warnings).toHaveLength(0);
     });
 
@@ -75,7 +89,7 @@ describe('resolver', () => {
         });
     });
 
-    it('should properly resolve modules with @rollup/rollup-node-resolve and third-party package', async () => {
+    it('should properly resolve modules with @rollup/plugin-node-resolve and third-party package', async () => {
         const { warnings } = await runRollup('third-party-import/src/main.js', {
             plugins: [nodeResolve()],
         });

packages/@lwc/rollup-plugin/src/index.ts

@@ -34,6 +34,11 @@ export interface RollupLwcOptions {
     sourcemap?: boolean | 'inline';
     /** The [module resolution](https://lwc.dev/guide/es_modules#module-resolution) overrides passed to the `@lwc/module-resolver`. */
     modules?: ModuleRecord[];
+    /**
+     * Default modules passed to the `@lwc/module-resolver`.
+     * If unspecified, defaults to `["@lwc/engine-dom", "@lwc/synthetic-shadow", "@lwc/wire-service"]`.
+     */
+    defaultModules?: ModuleRecord[];
     /** The stylesheet compiler configuration to pass to the `@lwc/style-compiler` */
     stylesheetConfig?: StylesheetConfig;
     /** The configuration to pass to the `@lwc/template-compiler`. */
@@ -69,6 +74,12 @@ const IMPLICIT_DEFAULT_CSS_PATH = '@lwc/resources/empty_css.css';
 const EMPTY_IMPLICIT_CSS_CONTENT = '';
 const SCRIPT_FILE_EXTENSIONS = ['.js', '.mjs', '.jsx', '.ts', '.mts', '.tsx'];
 
+const DEFAULT_MODULES = [
+    { npm: '@lwc/engine-dom' },
+    { npm: '@lwc/synthetic-shadow' },
+    { npm: '@lwc/wire-service' },
+];
+
 function isImplicitHTMLImport(importee: string, importer: string, importerExt: string): boolean {
     return (
         SCRIPT_FILE_EXTENSIONS.includes(importerExt) &&
@@ -158,6 +169,7 @@ export default function lwc(pluginOptions: RollupLwcOptions = {}): Plugin {
     const filter = pluginUtils.createFilter(pluginOptions.include, pluginOptions.exclude);
 
     let { rootDir, modules = [] } = pluginOptions;
+
     const {
         targetSSR,
         ssrMode,
@@ -172,6 +184,7 @@ export default function lwc(pluginOptions: RollupLwcOptions = {}): Plugin {
         experimentalComplexExpressions,
         disableSyntheticShadowSupport,
         apiVersion,
+        defaultModules = DEFAULT_MODULES,
     } = pluginOptions;
 
     return {
@@ -199,7 +212,7 @@ export default function lwc(pluginOptions: RollupLwcOptions = {}): Plugin {
                 rootDir = path.resolve(rootDir);
             }
 
-            modules = [...modules, { dir: rootDir }];
+            modules = [...modules, ...defaultModules, { dir: rootDir }];
         },
 
         resolveId(importee, importer) {