Push HMR updates before the SSR rebuild in dev

Client-only edits are sent to the browser right after the hydration build, without re-running server functions; SSR rebuilds afterwards and props are re-fetched only when a .server.ts output changed or after fullRebuild. Page requests wait for an in-flight SSR rebuild. The SSR build no longer runs Tailwind, the PostCSS processor is reused across rebuilds, and the watcher debounce drops from 200ms to 50ms. Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-11-05 07:32:33 +01:00
parent ed788dff97
commit 4d4a79a6dd
23 changed files with 460 additions and 98 deletions
@@ -1,5 +1,39 @@
 import _ from "lodash";
 import grabPageComponent from "./web-pages/grab-page-component";
+/**
+ * # Push a client-only HMR update
+ * Sends the new client bundle to every controller whose page is in
+ * `changed_pages`, without re-running server functions. The payload carries
+ * no `page_props`, so the browser keeps its current props and only swaps the
+ * hydration script/CSS. Used right after the hydration build so the browser
+ * doesn't wait for the SSR rebuild.
+ */
+export function pushClientUpdate(changed_pages) {
+    if (!global.BUNEXT_HMR_CONTROLLERS?.[0] || !global.BUNEXT_BUNDLER_CTX_MAP) {
+        return;
+    }
+    const changed_set = new Set(changed_pages);
+    for (let i = global.BUNEXT_HMR_CONTROLLERS.length - 1; i >= 0; i--) {
+        const controller = global.BUNEXT_HMR_CONTROLLERS[i];
+        const local_path = controller?.target_map?.local_path;
+        if (!controller || !local_path || !changed_set.has(local_path)) {
+            continue;
+        }
+        const target_artifact = global.BUNEXT_BUNDLER_CTX_MAP[local_path];
+        const payload = target_artifact?.path
+            ? { target_map: target_artifact }
+            : { reload: true };
+        try {
+            controller.controller.enqueue(`event: update\ndata: ${JSON.stringify(payload)}\n\n`);
+            if (target_artifact?.path) {
+                controller.target_map = target_artifact;
+            }
+        }
+        catch {
+            global.BUNEXT_HMR_CONTROLLERS.splice(i, 1);
+        }
+    }
+}
 export default async function serverPostBuildFn(params) {
    if (!global.BUNEXT_HMR_CONTROLLERS?.[0] || !global.BUNEXT_BUNDLER_CTX_MAP) {
        return;