Addon A11y: Run the a11y automigration on postInstall

code/addons/a11y/package.json

@@ -38,7 +38,8 @@
     },
     "./manager": "./dist/manager.js",
     "./register": "./dist/manager.js",
-    "./package.json": "./package.json"
+    "./package.json": "./package.json",
+    "./postinstall": "./dist/postinstall.js"
   },
   "main": "dist/index.js",
   "module": "dist/index.mjs",
@@ -87,6 +88,9 @@
     ],
     "previewEntries": [
       "./src/preview.tsx"
+    ],
+    "nodeEntries": [
+      "./src/postinstall.ts"
     ]
   },
   "gitHead": "e6a7fd8a655c69780bc20b9749c2699e44beae16",

code/addons/a11y/src/postinstall.ts

@@ -0,0 +1,12 @@
+import { spawn } from 'child_process';
+
+export default async function postInstall() {
+  await new Promise<void>((resolve) => {
+    const child = spawn('npx', ['storybook', 'automigrate', 'addonA11yAddonTest'], {
+      stdio: 'inherit',
+    });
+    child.on('close', (code) => {
+      resolve();
+    });
+  });
+}