[Webkit-unassigned] [Bug 255396] New: Unexpected 'var' resolution in module

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255396

            Bug ID: 255396
           Summary: Unexpected 'var' resolution in module
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tzvetelin.vassilev at wacom.com

Problem is observed with emscripten build. 

Generated Module looks in this way:

// Module.mjs
var Module = (() => {
        var _scriptDir = import.meta.url;

        return (
                async function(Module = {})  {
                        console.log(Module) // result is null, expected value is data

                        var Module = typeof Module != "undefined" ? Module : {};

                        console.log(Module) // result is {}

                        // emscripten stuff
                }
        );
})();

export default Module;

After import like this:

// index.mjs
let factory = (await import("Module.mjs")).default
await Module({/* data */})

Something is got wrong and Module value is lost.

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