Emit publish-order.json with per-package npm dist-tag (#3977)

Author: jakebailey

Herebyfile.mjs

@@ -1766,8 +1766,13 @@ async function runPackNativePreviewPackages() {
         mainNativePreviewPackage.npmTarball,
     ].map(p => path.basename(p));
 
-    const publishOrderPath = path.join(builtNpm, "publish-order.txt");
-    await fs.promises.writeFile(publishOrderPath, publishOrder.join("\n") + "\n");
+    const publishManifest = publishOrder.map(pkg => ({
+        filename: pkg,
+        tag: "latest",
+    }));
+
+    const publishOrderPath = path.join(builtNpm, "publish-order.json");
+    await fs.promises.writeFile(publishOrderPath, JSON.stringify(publishManifest, undefined, 4) + "\n");
 }
 
 export const packNativePreviewExtensions = task({