generate() error has no message

[drom]

While calling escodegen.generate() it throws an error. try - catch is an empty object. How can I get a little more diagnostics or error messages?

[michaelficarra]

Are you sure? The only objects thrown by escodegen are instances of Error, which should have a message field. Try running Object.getOwnPropertyNames on it if you are currently using Object.keys; the fields are non-enumerable.

[drom]

Yes, you are right. The is a message. My mistake, I tried to stringify() an Error object and got an empty {}. The message was very short anyway. Something like: Cannot read property 'type' of null so I have to run esvalid in case of error in order to get more info. But it is good. Thank you for help.

[michaelficarra]

Be careful, esvalid hasn't been updated with support for any of the nodes introduced for ES6 support.

[drom]

woops. Are you serious? Not even let?

[michaelficarra]

Let uses the existing variable declaration node, so it should be fine. I would love to get a PR that adds ES6 support if someone wants to take it.

[drom]

We have some volunteers for adding ES6 support, if I understand the following issue correctly: #221

[michaelficarra]

No, I think #221 expresses a desire to change the implementation of escodegen to make use of ES6 features, not add support for generating programs from ES6 AST nodes.

[drom]

Does this sound relevant? estools/esvalid#7

[michaelficarra]

Yes.