20 lines
2.2 KiB
Markdown
20 lines
2.2 KiB
Markdown
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# @deepseek-ai/dsh-client-hmr
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Hot reload for fetch-arrival client plugins. A static-arrival entry composed only into `--dev` graphs (`dsh web --dev`); production graphs omit the row, so the shell-bundled code stays inert.
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The plugin subscribes to the webserver's system SSE channel (`GET /plugins/events`) and reloads one plugin per `rebuilt` frame, serialized through a queue (the bundle handoff slot is single). The sequence per frame — `prefetch` (fetch the new bundle before touching anything), `invalidate`, `registry.delete` (before the fiber: a bare fiber dispose trips the vendored Loader's self-dispose branch, which would mark the entry disabled), drain the old fiber, delete `entry.fiber`, remove owned `<style data-plugin>` tags, `entry.refresh()` re-imports and remounts, `fiber.await()` rethrows startup failures loud. Dependents reload through cordis itself: a fiber's activation epoch strings its service providers' uids, so replacing a provider's fiber cascades every dependent with zero client-side graph analysis. Rebuild detection lives on the webserver: in dev mode it stat-polls each plugin's built `lib/client.js` (`fs.watchFile`) and broadcasts the `rebuilt` frame when the bundle's rev changes, so any tsdown watch process producing the bundle triggers HMR with no builder→host channel.
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## Model Experience
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None, as the reload driver is browser-side machinery; nothing here reaches a model request.
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#### KV Cache effect
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None; this package neither assembles nor sends a provider request.
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## Known Limitations and Deferred Work
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- **Reload is coarse by design** — a fresh fiber and fresh components; React state inside the reloaded plugin is lost while the data layer (connection/runtime fibers, Session objects) is untouched. react-refresh-grade state preservation conflicts with "re-executing the bundle re-runs the factory" and is deliberately out.
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- **No failure rollback** — a reload that fails leaves the entry FAILED and loud in the loader status projection; restoring the previous bundle automatically is deferred until a real need shows.
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- **Graph rev is not refreshed by rebuilt frames** — the stale rev is harmless (the bundle endpoint serves no-cache); rev refresh lands with the reconnect-handshake mechanism.
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