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Plain data objects #493
Plain data objects #493
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This looks great! This is really exciting. I just asked for a couple of clarifying comments in some of the subtler bits of the implementation.
Test failure is because Node.js 10 appears to return a Number in a mixed
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There was another complication:
I tried the first approach using I did work on a test for it too, but it requires a way to call into Rust functions from JS, which isn't yet implemented in this PR. I rebased #507 and added a test there. One final thing to check: does |
I thought I could be clever and micro-optimize this a bit, but `has_own_property` really does require a string argument, so we have to do the conversion first.
@goto-bus-stop I'll review more closely in a bit, thanks for updating! Technically, the semantics of
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@goto-bus-stop Oh, wait! Twitter came to the rescue and explained that |
Riiight Proxies…I really should've read the spec instead of guessing! I wanted to use |
Oh lol—the backport was released in |
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I guess tests won't pass on Node 12 until a new minor is released. Should we in the mean time just rely on my buggy implementation, and file a follow-up issue to upgrade as soon as a Node.js 12.x with the backport is available? |
@goto-bus-stop Thanks for all this detective work! I think your workaround is totally fine for now until the new API is backported to 12. Do you mind also filing a followup issue so we can replace the workaround once 12 is ready? |
filed follow up in #511 |
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Looks great, thanks so much for all the investigations and revisions you've done.
Implements these 'plain object' operations:
And the required tag checks to make that work, and the required array methods to make
get_own_property_names
usable.Most of it is quite straightforward, just calling napi functions. The remaining changes are about passing
Env
values to functions that need it under n-api, but did not need it under nan. The test for the object code uses downcasting, and the downcasting and typecheck code did not previously receive a reference to theEnv
. Thejs_array.len()
function also did not receive a reference to theEnv
, but needs one to eventually call the napi function.For the
js_array.len()
function, which is used by other methods on the impl, I added a privatelen_inner()
function with a consistent API to save some feature flag checks. It could be removed if the nan implementation is removed later.