Generate addons/backgrounds with ts-up

Ref: #18732

addons/backgrounds/manager.js

@@ -1 +1 @@
-import './dist/esm/manager';
+import './dist/manager';

addons/backgrounds/package.json

@@ -25,9 +25,32 @@
   },
   "license": "MIT",
   "author": "jbaxleyiii",
-  "main": "dist/cjs/index.js",
-  "module": "dist/esm/index.js",
-  "types": "dist/types/index.d.ts",
+  "exports": {
+    ".": {
+      "require": "./dist/index.js",
+      "import": "./dist/index.mjs",
+      "types": "./dist/index.d.ts"
+    },
+    "./manager": {
+      "require": "./dist/manager.js",
+      "import": "./dist/manager.mjs",
+      "types": "./dist/manager.d.ts"
+    },
+    "./preview": {
+      "require": "./dist/preview.js",
+      "import": "./dist/preview.mjs",
+      "types": "./dist/preview.d.ts"
+    },
+    "./register.js": {
+      "require": "./dist/manager.js",
+      "import": "./dist/manager.mjs",
+      "types": "./dist/manager.d.ts"
+    },
+    "./package.json": "./package.json"
+  },
+  "main": "dist/index.js",
+  "module": "dist/index.mjs",
+  "types": "dist/index.d.ts",
   "files": [
     "dist/**/*",
     "README.md",
@@ -36,9 +59,10 @@
   ],
   "scripts": {
     "check": "tsc --noEmit",
-    "prepare": "node ../../scripts/prepare.js"
+    "prepare": "esrun ../../scripts/prepare/bundle.ts"
   },
   "dependencies": {
+    "@digitak/esrun": "^3.2.2",
     "@storybook/addons": "7.0.0-alpha.16",
     "@storybook/api": "7.0.0-alpha.16",
     "@storybook/client-logger": "7.0.0-alpha.16",
@@ -70,6 +94,13 @@
   "publishConfig": {
     "access": "public"
   },
+  "bundler": {
+    "entries": [
+      "./src/index.ts",
+      "./src/manager.tsx",
+      "./src/preview.tsx"
+    ]
+  },
   "gitHead": "df30e7db2b251418af106345e5722477f057ec36",
   "storybook": {
     "displayName": "Backgrounds",

addons/backgrounds/preview.js

@@ -1 +1 @@
-export * from './dist/esm/preview';
+import './dist/preview';

yarn.lock

@@ -6910,6 +6910,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@storybook/addon-backgrounds@workspace:addons/backgrounds"
   dependencies:
+    "@digitak/esrun": ^3.2.2
     "@storybook/addons": 7.0.0-alpha.16
     "@storybook/api": 7.0.0-alpha.16
     "@storybook/client-logger": 7.0.0-alpha.16