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DEV: Improve diff streaming accuracy with safety checker #1338
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xfalcox
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May 15, 2025
SamSaffron
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May 21, 2025
Previously we attempted to add a diff streaming animation to the AI composer helper: #1332, but it resulted in issues despite attempted fixes (#1338) so we temporarily suppressed the diff animation (#1341). This update makes a second attempt at implementing the diff streaming animation. Instead of creating a custom diff algorithm, we make use of a third-party library [`jsDiff`](https://github.com/kpdecker/jsdiff) (which we added to core here: discourse/discourse#32833). While streaming, the diff animation often struggles with markdown links and images, so we make use of `markdown-it` parser to detect those cases and prevent breaking the animation. --------- Co-authored-by: Sam Saffron <[email protected]>
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🔍 Overview
This update adds a safety checker which scans the streamed updates. It ensures that incomplete segments of text are not sent yet over message bus as this will cause breakage with the diff streamer. It also updates the diff streamer to handle a thinking state for when we are waiting for message bus updates.
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