add v2 addon metadata

This adds v2-addon-style metadata to the package.json at publication. Our build already produces everything needed to be a valid v2 addon, other than this metadata.

This PR doesn't actually flip the final switch though (by adding `version: 2` to the metdata). So it's safe and nonbreaking. This just gets us one step closer.

And it's helpful because embroider users will be able to opt in to treating ember-source as v2 even before we force it to be v2 for everyone.

package.json

@@ -5,6 +5,11 @@
   "keywords": [
     "ember-addon"
   ],
+  "exports": {
+    "./*": "./dist/packages/*",
+    "./dist/ember-template-compiler.js": "./dist/ember-template-compiler.js",
+    "./package.json": "./package.json"
+  },
   "homepage": "https://emberjs.com/",
   "bugs": {
     "url": "https://github.com/emberjs/ember.js/issues"
@@ -174,7 +179,8 @@
     "node": ">= 18.*"
   },
   "ember-addon": {
-    "after": "ember-cli-legacy-blueprints"
+    "after": "ember-cli-legacy-blueprints",
+    "type": "addon"
   },
   "typesVersions": {
     "*": {

rollup.config.mjs

@@ -1,5 +1,5 @@
 import { dirname, parse, resolve, join } from 'node:path';
-import { existsSync, readFileSync, statSync } from 'node:fs';
+import { existsSync, readFileSync, statSync, writeFileSync } from 'node:fs';
 import { createRequire } from 'node:module';
 import { fileURLToPath } from 'node:url';
 import glob from 'glob';
@@ -71,6 +71,7 @@ function esmConfig() {
       version(),
       resolvePackages({ ...exposedDependencies(), ...hiddenDependencies() }),
       pruneEmptyBundles(),
+      packageMeta(),
     ],
   };
 }
@@ -498,6 +499,30 @@ function pruneEmptyBundles() {
   };
 }
 
+function packageMeta() {
+  let renamedModules = Object.fromEntries(
+    glob
+      .sync('**/*.js', { cwd: 'dist/packages', ignore: ['shared-chunks/**'], nodir: true })
+      .map((name) => {
+        return [name, 'ember-source/' + name];
+      })
+  );
+  return {
+    name: 'package-meta',
+    buildEnd(error) {
+      if (error) {
+        return;
+      }
+      let pkg = JSON.parse(readFileSync('package.json'));
+      if (!pkg['ember-addon']) {
+        pkg['ember-adodn'] = {};
+      }
+      pkg['ember-addon']['renamed-modules'] = renamedModules;
+      writeFileSync('package.json', JSON.stringify(pkg, null, 2));
+    },
+  };
+}
+
 function handleRollupWarnings(level, log, handler) {
   switch (log.code) {
     case 'CIRCULAR_DEPENDENCY':