[DevTools] Only show the highest end/byteSize I/O of RSC streams #34435
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We already do this for SuspenseNode.
This is a hack since it special cases the RSC stream. Ideally this concept would be modelled explicitly.
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eps1lon
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…oundary (#34438) Stacked on #34435. This adds a method to get all suspended by filtered by a specific Instance. The purpose of this is to power the feature when you filter by Activity. This would show you the "root" within that Activity boundary. This works by selecting the nearest Suspense boundary parent and then filtering its data based on if all the instances for a given I/O info is within the Activity instance. If something suspended within the Suspense boundary but outside the Activity it's not included even if it's also suspending inside the Activity since we assume it would've already been loaded then. Right now I wire this up to be a special case when you select an Activity boundary same as when you select a Suspense boundary in the Components tab but we could also only use this when you select the root in the Suspense tab for example.
This was referenced Sep 10, 2025
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Stacked on #34425.
RSC stream info is split into one I/O entry per chunk. This means that when a single instance or boundary depends on multiple chunks, it'll show the same stream multiple times. This makes it so just the last one is shown.
This is a special case for the name "RSC stream" but ideally we'd more explicitly model the concept of awaiting only part of a stream.
Another remaining issue is that it's possible for an intermediate chunk to be depended on by just a child boundary. In that case that can be considered a "unique suspender" even though the parent depends on a later one. Ideally it would dedupe on everything below. Could also model it as every Promise depends on its chunk and every previous chunk.