[Webkit-unassigned] [Bug 202433] REGRESSION (Safari 13): Accessing WebAssembly.Module creates a global Module function

[bugzilla-daemon at webkit.org]

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

--- Comment #6 from William Furr <wfurr at google.com> ---
It depends on how you declare the Module global.

Declaring it as "var Module" will prevent WebAssembly.Module from overwriting it:

> Module
< ReferenceError: Can't find variable: Module
> var Module = {}
< undefined
> WebAssembly.Module
< function Module() {
    [native code]
}
> Module
< {}

Declaring it was window.Module does not.  Accessing WebAssembly.Module overwrites a pre-existing window.Module property, but it can be redeclared after:

> window.Module
< undefined
> window.Module = {}
< {}
> WebAssembly.Module
< function Module() {
    [native code]
}
> window.Module
< function Module() {
    [native code]
}
> window.Module = {}
< {}
> window.Module
< {}

My test app does have a "var Module = { ...etc... }" as the third line of script, before the Emscripten script file that uses WebAssembly.Module is even loaded.  I still end up with "Module" as an alias for "WebAssembly.Module" by the end.  I'm not sure why.

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