New extension: Cross-Project by ampelc · Pull Request #2518 · TurboWarp/extensions

ampelc · 2026-05-30T21:51:33Z

Per the docs:

Mesh lets you communicate with other projects running in the same browser or in TurboWarp Desktop, using special versions of variables and broadcasts. This allows you to for example, create a game that talks to another project running at the same time.

This was actually a real feature in Scratch 1.4.

TODO: ws integration (though that can be added at a later time).

This is a copy of #2382 which is from an account I am now locked out of.

…into mesh * 'mesh' of ssh://github.com/ampelectrecuted/twextensions: [Automated] Update translations 2026-01-03 (TurboWarp#2378) SharkPool/Camera: Fix critical regression from previous commit (TurboWarp#2376) SharkPool/Camera V2 -- Fix hidden sprites not receiving camera updates (TurboWarp#2372) [Automated] Update translations 2025-12-31 (TurboWarp#2374) text.js -- Add array of regex matches block (TurboWarp#2306) Revert "SharkPool/CameraV2 -- Fix hidden sprites not receiving camera updates" (TurboWarp#2371) cursor: translate cursor menu (TurboWarp#2076) SharkPool/CameraV2: Fix hidden sprites not receiving camera updates (TurboWarp#2359) local-storage: fix it generally not working (TurboWarp#2368) [Automated] Update translations 2025-12-20 (TurboWarp#2362) [Automated] Update translations 2025-12-17 (TurboWarp#2360) [Automated] Update translations 2025-12-13 (TurboWarp#2358) build(deps): bump @turbowarp/types from `c54f2cc` to `938c3ab` (TurboWarp#2355)

…into mesh * 'mesh' of ssh://github.com/ampelectrecuted/twextensions: 8to16/mesh: remove old debugging log

SharkPool-SP · 2026-05-30T22:39:32Z

I dont think 'Mesh' is the greatest name for this

GarboMuffin · 2026-05-31T03:11:47Z

Is this meaningfully compatible or equivalent with the Scratch 1.4 feature enough to justify giving it the same name?

ampelc · 2026-05-31T09:36:11Z

Is this meaningfully compatible or equivalent with the Scratch 1.4 feature enough to justify giving it the same name?

actually not really

since mesh might be confusing to some anyways i've renamed this to cross-project

Brackets-Coder · 2026-06-25T17:17:09Z

!format

SharkPool-SP

I really like this extension, but do these first. I can also make a better banner for you if you want

SharkPool-SP · 2026-07-01T21:40:18Z

+    vm.runtime.extensionStorage["8to16mesh"] = { messages: [], variables: {} };
+  });
+  vm.runtime.on("PROJECT_LOADED", () => {
+    vm.runtime.extensionManager.refreshBlocks();


vm.extensionManager.refreshBlocks() takes in arguments to refresh a specific extension palette. For optimization, use your extension id as the first argument

SharkPool-SP · 2026-07-01T21:40:47Z

+      ...getMeshages(),
+      name,
+    ];
+    vm.extensionManager.refreshBlocks();


SharkPool-SP · 2026-07-01T21:41:03Z

+    vm.runtime.extensionStorage["8to16mesh"].messages = getMeshages().filter(
+      (n) => n !== name
+    );
+    vm.extensionManager.refreshBlocks();


SharkPool-SP · 2026-07-01T21:41:27Z

+      ...getMeshVars(),
+      [name]: "",
+    };
+    vm.extensionManager.refreshBlocks();


SharkPool-SP · 2026-07-01T21:41:44Z

+    vm.runtime.extensionStorage["8to16mesh"].variables = Object.fromEntries(
+      Object.entries(getMeshVars()).filter((v) => v[0] !== name)
+    );
+    vm.extensionManager.refreshBlocks();


SharkPool-SP · 2026-07-01T21:47:00Z

+        id: "eightxtwoMesh",
+        name: Scratch.translate("Cross-Project"),
+        docsURI: "https://extensions.turbowarp.org/8to16/mesh",
+        color1: "#4cdab2",


I would make the block color a bit darker so you can see the block text better

SharkPool-SP · 2026-07-01T21:48:14Z

+      await new Promise((resolve) => {
+        const poll = () => {
+          if (finishedWaits[BROADCAST] >= connectedUsers) resolve();
+          else setTimeout(poll, 25);


same thing with runtime.on("AFTER_EXECUTE"), alternatively use util.yield(), which I can give examples for.

SharkPool-SP · 2026-07-01T21:49:40Z

+  // Init the broadcastchannel
+  const bc = new BroadcastChannel("extensions.turbowarp.org/8to16/mesh");
+  let connectedUsers = 0;
+  let finishedWaits = {};


change {} to Object.create(null) since keys are set by users, which means they can set dangerous keys like toString or prototype

SharkPool-SP · 2026-07-01T21:49:45Z

+  let finishedWaits = {};
+
+  if (!vm.runtime.extensionStorage["8to16mesh"])
+    vm.runtime.extensionStorage["8to16mesh"] = { messages: [], variables: {} };


change {} to Object.create(null) since keys are set by users, which means they can set dangerous keys like toString or prototype

SharkPool-SP · 2026-07-01T21:49:49Z

+  if (!vm.runtime.extensionStorage["8to16mesh"])
+    vm.runtime.extensionStorage["8to16mesh"] = { messages: [], variables: {} };
+  vm.runtime.on("RUNTIME_DISPOSED", () => {
+    vm.runtime.extensionStorage["8to16mesh"] = { messages: [], variables: {} };


change {} to Object.create(null) since keys are set by users, which means they can set dangerous keys like toString or prototype

8to16 and others added 20 commits January 9, 2026 21:52

mesh is here, kinda

e3182f2

8to16/mesh: mvp

3b0b338

8to16/mesh: tweaks

99b6887

8to16/mesh: docs tweak

86a5044

8to16/mesh: remove old debugging log

d4bd977

8to16/mesh: change image

253f9d2

Merge branch 'mesh' of ssh://github.com/ampelectrecuted/twextensions …

b29fd10

…into mesh * 'mesh' of ssh://github.com/ampelectrecuted/twextensions: 8to16/mesh: remove old debugging log

8to16/mesh: newlines are poisonous

2737b5c

8to16/mesh: works in turbowarp desktop

1f7c9b4

8to16/mesh: minor docs update

ca4ec73

8to16/mesh: WIP enhancements

e15c55c

8to16/mesh: stabilised mostly

b414770

8to16/mesh: ready for review?

38fe1e1

8to16/mesh: bugfix with change var

fcf0e38

8to16/mesh: standards

51fc2dc

8to16/mesh: make extensionstorage less ambiguous

57be6d4

8to16/mesh: typo docs

b1b16c9

fix typo in image attribution

49cf145

8to16/mesh: fix bug

f14c47d

ampelc requested a review from a team as a code owner May 30, 2026 21:51

github-actions Bot added the pr: new extension Pull requests that add a new extension label May 30, 2026

Merge branch 'master' into mesh

87fdd4d

ampelc added 2 commits May 31, 2026 10:26

Rename Mesh extension to Cross-Project

90ad0f1

8to16/mesh: cross-project in docs

f72135a

ampelc changed the title ~~New extension: Mesh~~ New extension: Cross-Project May 31, 2026

[Automated] Format code

55c05e9

SharkPool-SP requested changes Jul 1, 2026

View reviewed changes

Uh oh!

Conversation

ampelc commented May 30, 2026

Uh oh!

SharkPool-SP commented May 30, 2026

Uh oh!

GarboMuffin commented May 31, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

ampelc commented May 31, 2026

Uh oh!

Brackets-Coder commented Jun 25, 2026

Uh oh!

SharkPool-SP left a comment

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Choose a reason for hiding this comment

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

6 participants

GarboMuffin commented May 31, 2026 •

edited

Loading