fix(ast): treat TSEmptyBodyFunctionExpression as expression in Function::is_expression

[liangmiQwQ]

About #14944

Prevents panic by regarding TSEmptyBodyFunctionExpression as expressions

ps:

• This PR resolve the panic issue, but doesn't include the syntax validation changes, so please don't close the issue if the PR closes
• This fix doesn't include additional test cases as existing tests keep passing. If the tests are needed, I may need guidance on how to write them (or any document urls).

Thanks ❤️

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[codspeed-hq]

CodSpeed Performance Report

Merging #14945 will not alter performance

_{Comparing liangmiQwQ:fix/regard-TSEmptyBodyFunctionExpression-as-experssion (15f875d) with main (34fab40)}

Summary

✅ 37 untouched

[camc314]

@liangmiQwQ thanks for working on this. Is this still needed since #14946 got merged?

[liangmiQwQ]

Thanks, I'm also not completely sure. The panic caused by const foo = function bar() got fixed by your PR.

I think it depends: if there are other cases that create TSEmptyBodyFunctionExpression and need symbol_id, this PR might help. If not, it can be closed.

And I'm not sure about whether there is anything like it. What do you think?