Add support for copying the public assets all at once.

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

@@ -0,0 +1,32 @@
+import { readJsonSync, writeJsonSync } from 'fs-extra';
+import walkSync from 'walk-sync';
+import type { Plugin } from 'rollup';
+
+export default function publicAssets(opts: { exclude: string[] }): Plugin {
+  return {
+    name: 'public-assets-bundler',
+    generateBundle() {
+      let pkg = readJsonSync('package.json');
+      let filenames;
+
+      filenames = walkSync('public', {
+        directories: false,
+        ignore: opts.exclude || [],
+      });
+
+      const publicAssets: Record<string, string> = filenames.reduce(
+        (acc: Record<string, string>, v): Record<string, string> => {
+          acc['./public/' + v] = ['/', pkg.name, '/', v].join('');
+          return acc;
+        },
+        {}
+      );
+
+      pkg['ember-addon'] = Object.assign({}, pkg['ember-addon'], {
+        'public-assets': publicAssets,
+      });
+
+      writeJsonSync('package.json', pkg, { spaces: 2 });
+    },
+  };
+}

packages/addon-dev/src/rollup.ts

@@ -4,6 +4,7 @@ import { default as appReexports } from './rollup-app-reexports';
 import { default as clean } from 'rollup-plugin-delete';
 import { default as keepAssets } from './rollup-keep-assets';
 import { default as dependencies } from './rollup-addon-dependencies';
+import { default as publicReexports } from './rollup-public-reexports';
 import type { Plugin } from 'rollup';
 
 export class Addon {
@@ -83,4 +84,8 @@ export class Addon {
   dependencies() {
     return dependencies();
   }
+
+  publicAssets(opts: { exclude: string[] }) {
+    return publicReexports(opts);
+  }
 }