Backport #1642 to stable: Allow for more flexible addon-dev appReexports

packages/addon-dev/src/rollup-app-reexports.ts

@@ -8,6 +8,7 @@ export default function appReexports(opts: {
   to: string;
   include: string[];
   mapFilename?: (filename: string) => string;
+  exports?: (filename: string) => string[] | string | undefined;
 }): Plugin {
   return {
     name: 'app-reexports',
@@ -16,6 +17,12 @@ export default function appReexports(opts: {
       let appJS: Record<string, string> = {};
       for (let addonFilename of Object.keys(bundle)) {
         let appFilename = opts.mapFilename?.(addonFilename) ?? addonFilename;
+        let appExports = opts.exports?.(addonFilename) || ['default'];
+
+        let computedExports =
+          typeof appExports === 'string'
+            ? appExports
+            : `{ ${appExports.join(', ')} }`;
 
         if (
           opts.include.some((glob) => minimatch(addonFilename, glob)) &&
@@ -25,10 +32,9 @@ export default function appReexports(opts: {
           this.emitFile({
             type: 'asset',
             fileName: `_app_/${appFilename}`,
-            source: `export { default } from "${pkg.name}/${addonFilename.slice(
-              0,
-              -extname(addonFilename).length
-            )}";\n`,
+            source: `export ${computedExports} from "${
+              pkg.name
+            }/${addonFilename.slice(0, -extname(addonFilename).length)}";\n`,
           });
         }
       }

packages/addon-dev/src/rollup.ts

@@ -23,13 +23,17 @@ export class Addon {
   // package.json metadata to list them all.
   appReexports(
     patterns: string[],
-    opts: { mapFilename?: (fileName: string) => string } = {}
+    opts: {
+      mapFilename?: (fileName: string) => string;
+      exports?: (filename: string) => string[] | string | undefined;
+    } = {}
   ): Plugin {
     return appReexports({
       from: this.#srcDir,
       to: this.#destDir,
       include: patterns,
       mapFilename: opts.mapFilename,
+      exports: opts.exports,
     });
   }
 

tests/scenarios/v2-addon-dev-typescript-test.ts

@@ -21,6 +21,9 @@ appScenarios
     addon.pkg.scripts = {
       build: 'node ./node_modules/rollup/dist/bin/rollup -c ./rollup.config.mjs',
     };
+    addon.pkg['ember-addon']['app-js'] = {
+      './components/previously-added.js': './dist/_app_/components/previously-added.js',
+    };
 
     merge(addon.files, {
       'babel.config.json': `
@@ -91,14 +94,25 @@ appScenarios
         plugins: [
           addon.publicEntrypoints([
             'components/**/*.js',
+            'initializers/**/*.js',
+            'utils/**/*.js',
           ]),
 
           addon.appReexports([
             'components/demo/index.js',
             'components/demo/out.js',
             'components/demo/namespace-me.js',
+            'initializers/**/*.js',
+            'utils/**/*.js',
           ], {
             mapFilename: (name) => reexportMappings[name] || name,
+            exports: (name) => {
+              if (name.startsWith('initializers/')) {
+                return ['default', 'initialize'];
+              } else if (name.startsWith('utils/')) {
+                return '*';
+              }
+            }
           }),
 
           addon.dependencies(),
@@ -167,6 +181,25 @@ appScenarios
             `,
           },
         },
+        initializers: {
+          'demo.js': `
+            export function initialize() {
+              // Wow, we're doing the init in the app
+            }
+
+            export default {
+              name: 'demo',
+              initialize,
+            };
+          `,
+        },
+        utils: {
+          'demo-util.js': `
+            export function demoUtil() {
+              return 42;
+            }
+          `,
+        },
       },
     });
 
@@ -250,6 +283,8 @@ appScenarios
             './components/demo/index.js': './dist/_app_/components/demo/index.js',
             './components/demo/out.js': './dist/_app_/components/demo/out.js',
             './components/demo/namespace/namespace-me.js': './dist/_app_/components/demo/namespace/namespace-me.js',
+            './initializers/demo.js': './dist/_app_/initializers/demo.js',
+            './utils/demo-util.js': './dist/_app_/utils/demo-util.js',
           });
         });
 
@@ -260,6 +295,8 @@ appScenarios
             './dist/_app_/components/demo/out.js': 'export { default } from "v2-addon/components/demo/out";\n',
             './dist/_app_/components/demo/namespace/namespace-me.js':
               'export { default } from "v2-addon/components/demo/namespace-me";\n',
+            './dist/_app_/initializers/demo.js': 'export { default, initialize } from "v2-addon/initializers/demo";\n',
+            './dist/_app_/utils/demo-util.js': 'export * from "v2-addon/utils/demo-util";\n',
           };
 
           assert.strictEqual(