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While this appears to work for HTML integration in the test cases that I have run it against so far (though, I have not tested extensively with importValue) unfortunately I have just found that it breaks some of the test-262 / test-js test cases (previously all test-262 cases were passing).
One of the failing test cases is this test case: https://github.com/LadybirdBrowser/ladybird/blob/5deb2b4cad3755c7e9251f6b23e9b1089b029aa7/Libraries/LibJS/Tests/builtins/ShadowRealm/ShadowRealm.prototype.importValue.js#L22
Where I am now getting:
FAIL builtins/ShadowRealm/ShadowRealm.prototype.importValue.js
❌ Suite: normal behavior
Test: basic functionality (failed):
ExpectationError: Expected target to be null got TypeError: Cannot find/open module: './external-module.mjs'
I will try and investigate a bit more to find out what the problem is. Will also need to cross-check this against tc39/ecma262#3374
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I will note that it is possible this is also a bug on my end in other areas of module loading outside of this change, but will just mention it incase
edit: I may have been incorrect earlier with saying that tc39/ecma262#3374 fixed the issue I was seeing, there may have been a specific case that it resolved, but on further testing I am running into issues with WPT tests with it. This change resolves the issues I am seeing with WPT, but seems to cause issues in the JS suite I am running against. tc39/ecma262#3374 does not break the JS test suite, but causes issues with WPT test cases. I need to do some further analysis to figure out what is going wrong...
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