How is VariableDeclaration an Expression?

[Sébastien Ros]

Using this code:

for (let n of fibonacci) {

    

};

The "let n" portion is parsed as a VariableDeclaration, which is a Statement (and a Declaration), and assigned to the 'left' property of ForOfStatement, as per https://github.com/jquery/esprima/blob/master/src/nodes.ts

How do you explain that the ForOfStatement constructor only accepts an Expression for its 'left' property and there is no mismatch as per https://github.com/jquery/esprima/blob/master/src/nodes.ts#L315

Is that some TypeScript magic?

Thanks

[Ariya Hidayat]

I think it's mostly because the code for parsing the for/for-of/for-in statement does not use type annotations that much.

Speaking of which, the entire for/for-of/for-in statement parsing is a mess anyway. It contains a few defects which are hard to fix with the current state of the code. Cleaning it up is something I am planning to prioritize pretty soon.

Thank you!

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Ariya Hidayat, https://ariya.io

[Jonny Johnson]

Hi. I noticed this post and wonder if the forStatement have been cleaned up and the bugs been fixed? Or is the variable declaration still an expression? I also noticed you should prioritize this very soon, so nice to get an update on the progress.