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Find an alternative to V8's Debug Mirror API for util.inspect #11875
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The functionality you are looking for are exposed directly in the V8 API. Take a look at v8::Map, v8::Set, and v8::Promise. No need to go through the inspector.
Reacted by F. HinkelmannAhh I was only looking at the
v8.hin the current Node.js tree which doesn't havev8::Promise::Result()etc. However, I'm still not sure how one would be able to inspect an iterator object. While there isv8::Value::IsMapIterator()there isn't a correspondingv8::MapIteratorclass to provide information about the current index of the iterator.Either way I'm glad there's someone on top of this already.
I guess we could consider adding an API for Map- and SetIterators. Then again, the inspector actually also offers the set of functionality you are looking for.
Take a look at this inspector test and its expected result.
Yes, I have been tracking the migration of the Debug context. The idea that either we can start using bona fide V8 apis (e.g. to inspect promises) or use the inspector in-process. The latter depends on the inspector being available in-process to JavaScript, which is dependent on a few changes, the first of which is #11431, which is currently blocked on reviews.
This should remain open?
An alternative to
Debug.MakeMirror()is in #13295.
Currently we are able to display certain hidden properties of objects from
util.inspectthrough the V8 debug context'sMakeMirror:node/lib/util.js
Lines 287 to 288 in e296ffb
node/lib/util.js
Lines 739 to 741 in e296ffb
While it works just fine currently, the V8 debugger API will be deprecated in V8 5.9 in favor of the v8 inspector API. We'll need to find a way to use the inspector API for this purpose.
/cc @nodejs/v8