[Webkit-unassigned] [Bug 202433] New: Accessing WebAssembly.Module creates a global Module function

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202433

            Bug ID: 202433
           Summary: Accessing WebAssembly.Module creates a global Module
                    function
           Product: WebKit
           Version: Other
          Hardware: All
                OS: macOS 10.14
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: WebAssembly
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wfurr at google.com

Emscripten by default creates a global "Module" object that has all of its exported functions for interacting with the WebAssembly instance from JavaScript (e.g. embind functions, the Emscripten C API, etc.).  When I run in Safari, Emscripten's Module object is stomped on by a global Module function that is the same as WebAssembly.Module.

Here's a minimal example showing that Module is undefined until WebAssembly.Module is accessed: https://jsfiddle.net/vbo4zugk/

Safari 13.0.1 (14608.2.11.11)
MacOS Mojave 10.14.6

This used to work, and I suspect the bug is new in Safari 13.  I don't have Safari 12 to test on, and I'm not sure how to get older versions of Safari.

This bug is breaking any website that uses WebAssembly and the default Emscripten settings.  e.g. https://keep.google.com and https://canvas.apps.chrome.

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