This should work. The `sourceEnd` doesn't provide any further information. The [script-source-extent](https://searchfox.org/mozilla-central/source/js/src/jit-test/tests/parser/script-source-extent.js) test shows a number of the potentially issues, and it looks fine. The one particularly tricky one is lazy arrow functions in default argument expressions, but only one of these is ever delazified.
Bug 1687400 Comment 1 Edit History
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This should work. The `sourceEnd` doesn't provide any further information. The [script-source-extent](https://searchfox.org/mozilla-central/source/js/src/jit-test/tests/parser/script-source-extent.js) test shows a number of the potentially issues, and it looks fine. The one particularly tricky one is lazy arrow functions in default argument expressions, but only one of these is ever delazified. Edit: One edge case will be `() => {};` where the function starts at 0 which is currently the null key. This is easy to fix though.