From f82095b94cddd68c63d11e6e69419bbb93b112c8 Mon Sep 17 00:00:00 2001
From: Muspi Merol <me@promplate.dev>
Date: Thu, 29 Oct 2026 16:00:37 +0800
Subject: [PATCH 1/3] fix: stop console initialization after unmount

---
 .../components/console/HeadlessConsole.svelte   | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/lib/components/console/HeadlessConsole.svelte b/src/lib/components/console/HeadlessConsole.svelte
index 93c6109..bb654a3 100644
--- a/src/lib/components/console/HeadlessConsole.svelte
+++ b/src/lib/components/console/HeadlessConsole.svelte
@@ -13,7 +13,7 @@
 
 <script lang="ts">
   import { getPy, initConsole } from "$lib/pyodide";
-  import { afterUpdate, beforeUpdate, onMount } from "svelte";
+  import { afterUpdate, beforeUpdate, onDestroy, onMount } from "svelte";
 
   export let ready = false;
   export let status: Status = "complete";
@@ -23,12 +23,25 @@
   export let autoScroll: false | "instant" | "smooth" = "smooth";
 
   let loading = 0;
+  let disposed = false;
 
   let getWrapped: (future: PyAwaitable) => Promise<[unknown, string]>;
 
+  onDestroy(() => {
+    disposed = true;
+    if (ready) {
+      pyConsole.stdout_callback = undefined;
+      pyConsole.stderr_callback = undefined;
+    }
+  });
+
   onMount(async () => {
     const py = await getPy();
+    if (disposed)
+      return;
     await initConsole();
+    if (disposed)
+      return;
     pyConsole = py.globals.get("console");
     complete = py.globals.get("complete");
     getWrapped = py.globals.get("get_wrapped");
@@ -40,6 +53,8 @@
   });
 
   export function pushLog(item: Item, behind?: Item) {
+    if (disposed)
+      return;
     if (!log.length)
       return void (log = [item]);
 

From 8901957806bfce55e25d02150e42a89256ec729e Mon Sep 17 00:00:00 2001
From: Muspi Merol <me@promplate.dev>
Date: Thu, 29 Oct 2026 16:28:15 +0800
Subject: [PATCH 2/3] fix: cancel console setup before changing Python globals

---
 src/lib/components/console/HeadlessConsole.svelte | 13 +++++++------
 src/lib/pyodide/init.ts                           |  5 +++--
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/src/lib/components/console/HeadlessConsole.svelte b/src/lib/components/console/HeadlessConsole.svelte
index bb654a3..613d3ed 100644
--- a/src/lib/components/console/HeadlessConsole.svelte
+++ b/src/lib/components/console/HeadlessConsole.svelte
@@ -23,12 +23,13 @@
   export let autoScroll: false | "instant" | "smooth" = "smooth";
 
   let loading = 0;
-  let disposed = false;
+  const controller = new AbortController();
+  const { signal } = controller;
 
   let getWrapped: (future: PyAwaitable) => Promise<[unknown, string]>;
 
   onDestroy(() => {
-    disposed = true;
+    controller.abort();
     if (ready) {
       pyConsole.stdout_callback = undefined;
       pyConsole.stderr_callback = undefined;
@@ -37,10 +38,10 @@
 
   onMount(async () => {
     const py = await getPy();
-    if (disposed)
+    if (signal.aborted)
       return;
-    await initConsole();
-    if (disposed)
+    await initConsole(signal);
+    if (signal.aborted)
       return;
     pyConsole = py.globals.get("console");
     complete = py.globals.get("complete");
@@ -53,7 +54,7 @@
   });
 
   export function pushLog(item: Item, behind?: Item) {
-    if (disposed)
+    if (signal.aborted)
       return;
     if (!log.length)
       return void (log = [item]);
diff --git a/src/lib/pyodide/init.ts b/src/lib/pyodide/init.ts
index de4fc66..4b61b9e 100644
--- a/src/lib/pyodide/init.ts
+++ b/src/lib/pyodide/init.ts
@@ -47,7 +47,8 @@ async function initPy() {
 
 export const getPy = cacheSingleton(withToast(initPy, { loading: "preparing pyodide runtime", success: `successfully initialized pyodide runtime` }));
 
-export async function initConsole() {
+export async function initConsole(signal?: AbortSignal) {
   const [py, { default: initConsoleCode }] = await Promise.all([getPy(), import("./console.py?raw")]);
-  await py.runPythonAsync(initConsoleCode);
+  if (!signal?.aborted)
+    await py.runPythonAsync(initConsoleCode);
 }

From afc8b539d4563961f0adbc95ed85e11f77b5b4f0 Mon Sep 17 00:00:00 2001
From: Muspi Merol <me@promplate.dev>
Date: Fri, 30 Oct 2026 03:28:08 +0800
Subject: [PATCH 3/3] fix: report console initialization failures

---
 src/lib/components/console/HeadlessConsole.svelte | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/lib/components/console/HeadlessConsole.svelte b/src/lib/components/console/HeadlessConsole.svelte
index 613d3ed..b3cd3a0 100644
--- a/src/lib/components/console/HeadlessConsole.svelte
+++ b/src/lib/components/console/HeadlessConsole.svelte
@@ -14,6 +14,7 @@
 <script lang="ts">
   import { getPy, initConsole } from "$lib/pyodide";
   import { afterUpdate, beforeUpdate, onDestroy, onMount } from "svelte";
+  import { toast } from "svelte-sonner";
 
   export let ready = false;
   export let status: Status = "complete";
@@ -40,7 +41,14 @@
     const py = await getPy();
     if (signal.aborted)
       return;
-    await initConsole(signal);
+    try {
+      await initConsole(signal);
+    }
+    catch (error) {
+      if (!signal.aborted)
+        toast.error("Unable to initialize console", { description: String(error), action: { label: "Reload", onClick: () => location.reload() } });
+      return;
+    }
     if (signal.aborted)
       return;
     pyConsole = py.globals.get("console");