1 files changed, 52 insertions, 0 deletions
diff --git a/packages/web-util/src/live-reload.ts b/packages/web-util/src/live-reload.ts
new file mode 100644
index 000000000..bae0a5b84
--- /dev/null
+++ b/packages/web-util/src/live-reload.ts
@@ -0,0 +1,52 @@
+/* eslint-disable no-undef */
+
+function setupLiveReload(): void {
+  const ws = new WebSocket("wss://localhost:8080/ws");
+
+  ws.addEventListener("message", (message) => {
+    try {
+      const event = JSON.parse(message.data);
+      if (event.type === "file-updated-start") {
+        showReloadOverlay();
+        return;
+      }
+      if (event.type === "file-updated-done") {
+        window.location.reload();
+        return;
+      }
+    } catch (e) {
+      return
+    }
+    console.log("unsupported", event);
+  });
+
+  ws.addEventListener("error", (error) => {
+    console.error(error);
+  });
+  ws.addEventListener("close", (message) => {
+    setTimeout(setupLiveReload, 1500);
+  });
+}
+setupLiveReload();
+
+
+function showReloadOverlay(): void {
+  const d = document.createElement("div");
+  d.style.position = "absolute";
+  d.style.width = "100%";
+  d.style.height = "100%";
+  d.style.color = "white";
+  d.style.backgroundColor = "rgba(0,0,0,0.5)";
+  d.style.display = "flex";
+  d.style.justifyContent = "center";
+  const h = document.createElement("h1");
+  h.style.margin = "auto";
+  h.innerHTML = "reloading...";
+  d.appendChild(h);
+  if (document.body.firstChild) {
+    document.body.insertBefore(d, document.body.firstChild);
+  } else {
+    document.body.appendChild(d);
+  }
+}
+