tauri: Trying to check if an object is an instance of SharedArrayBuffer throws error.

Describe the bug During runtime Tauri interprets SharedArrayBuffer as a variable when checking instance types using instanceof. For example this code:

console.log({} instanceof SharedArrayBuffer);

would throw :

Unhandled Promise Rejection: ReferenceError: Can't find variable: SharedArrayBuffer

instead of printing false to the console.

To Reproduce

Run the code console.log({} instanceof SharedArrayBuffer);
Throws error

Expected behavior Should just print false

Platform and Versions (please complete the following information):

OS: Ubuntu 20.10 Node: v15.3.0 NPM: 7.0.14 Rustc: 1.50.0

About this issue

Original URL
State: open
Created 3 years ago
Reactions: 6
Comments: 19 (15 by maintainers)

Most upvoted comments

I just tested on Ubuntu 22.04 with libwebkit2gtk-4.0-dev/jammy,now 2.36.0-2ubuntu1. Using the localhost plugin (https://github.com/tauri-apps/tauri/issues/3917#issuecomment-1104433755), I can get window.crossOriginIsolated to be true, but SharedArrayBuffer is still not available.

pwespi on Apr 21, 2022

WebKit/WebKit#8578 (comment) describes the implementation and platform support surface attached to the merged changes that enable access to SharedArrayBuffer Objects docs using Atomics.waitAsync() docs on the main thread running JavaScriptCore.

Might be worth re-running tests on latest release of iOS, OSX and a linux build with updated WebKitGTK

franz-fletcher on May 25, 2023

I tried to set the headers on macOS and window.crossOriginIsolated is still false.

WindowBuilder::new(
        app,
        "main",
        tauri::WindowUrl::App("index.html".into()),
      )
      .title("Tauri")
      .on_web_resource_request(|req, resp| {
        if req.uri().starts_with("tauri://") {
          resp.headers_mut().insert(
            "Cross-Origin-Opener-Policy",
            "same-origin".try_into().unwrap(),
          );
          resp.headers_mut().insert(
            "Cross-Origin-Embedder-Policy",
            "require-corp".try_into().unwrap(),
          );
          println!("done");
        }
      })
      .build()?;

This might not be supported on webviews at all.

This solution can be used on Windows though.

lucasfernog on Apr 20, 2022

I still see false printed to the console. I am on windows though. I will have to test it on my linux machine later.

amrbashir on Apr 18, 2021

This is the app I’m using for testing: https://github.com/pwespi/tauri-app-shared-array-buffer (uses the localhost plugin).

The frontend part of it is deployed to https://tauri-app-shared-array-buffer.vercel.app/, such that it can also be used to test browsers.

Notable results:

Test	`SharedArrayBuffer` available
Tauri App on Ubuntu 22.04.3, WebKitGTK 2.42.3	false
Epiphany Browser on Ubuntu 22.04.3, WebKitGTK 2.42.3	false
Tauri App on macOS 14.2.1	true
Safari on macOS 14.2.1	true
Safari on iOS 17.2.1	true

pwespi on Jan 2, 2024

Supporting SharedArrayBuffer would unblock access to packages like:

Does anyone have any updates or workarounds?

jlarmstrongiv on May 19, 2023

I guess that it was removed due to Spectre (note the deprecation of high-resolution timers too). We should probably nudge the webkit devs to look into re-enabling.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer#security_requirements

This is definitely upstream and not anything either Tauri nor WRY can do anything about. Sorry

nothingismagick on Apr 18, 2021