fix: custom instanceof Handler result should be cast to boolean

[liby]

Description:

• helper.instanceof does not cast [Symbol.hasInstance] call to boolean

Related issue (if exists):

• Closes Instance Error Return Undefined #2836

Also: If need to add a test case, please tell me how to do it, I may not know the situation.

[CLAassistant]

All committers have signed the CLA.

[kdy1]

Thanks!

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swc-bump:

• swc_ecma_transforms_base

[kdy1]

Please run UPDATE=1 cargo test in the swc crate directory

[kdy1]

Marking as change requested

[liby]

Please run UPDATE=1 cargo test in the swc crate directory

I didn't get any fails:

test result: ok. 4185 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 16.71s

  Doc-tests swc

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

[kdy1]

swc-bump:

• swc_ecma_transforms_base

[liby]

@kdy1 🙏 I would like to ask if I can run update-all to update the test after the fix is done? I don't see similar instructions in the contribution guide.

[kdy1]

Yes, I think the update-all script will update most of the fixtures.
It's not documented as it's added too recently.