[pull] main from facebook:main #27
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This clarifies a few things by ensuring that there is always at least
one required field. This can be used to refine the object to one of the
specific types. However, it's probably just a matter of time until we
make this tagged unions instead. E.g. it would be nice to rename the
`name` field `ReactComponentInfo` to `type` and tag it with the React
Element symbol because then it's just the same as a React Element.
I also extract a time field. The idea is that this will advance (or
rewind) the time to the new timestamp and then anything below would be
defined as happening within that time stamp. E.g. to model the start and
end for a server component you'd do something like:
```
[
{time: 123},
{name: 'Component', ... },
{time: 124},
]
```
The reason this needs to be in the `ReactDebugInfo` is so that timing
information from one environment gets transferred into the next
environment. It lets you take a Promise from one world and transfer it
into another world and its timing information is preserved without
everything else being preserved.
I've gone back and forth on if this should be part of each other Info
object like `ReactComponentInfo` but since those can be deduped and can
change formats (e.g. this should really just be a React Element) it's
better to store this separately.
The time format is relative to a `timeOrigin` which is the current
environment's `timeOrigin`. When it's serialized between environments
this needs to be considered.
Emitting these timings is not yet implemented in this PR.
---------
Co-authored-by: eps1lon <[email protected]>
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