deepseek-harness/packages/client/hmr

@deepseek-ai/dsh-client-hmr

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Hot reload for script-loaded client plugins. The web bundle mounts the row unconditionally; without a rebuild watcher (pnpm run dev:web) rewriting client bundles, the poll observes no changes and the chain stays idle.

The browser half subscribes to the system SSE channel (GET /plugins/events) and reloads one plugin per rebuilt frame through a serialized queue. The sequence per frame — invalidate, prefetch (load and register the new bundle while the old fiber still serves), 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. The node half detects rebuilds with one interval that stat-polls each graph bundle from a synchronous baseline, immediately re-hashes after adding a row, retains missing rows as dirty, and broadcasts only real rev changes; any tsdown watch process producing the bundle therefore triggers HMR with no builder→host channel.

Model Experience

None, as the reload driver is browser-side machinery; nothing here reaches a model request.

KV Cache effect

None; this package neither assembles nor sends a provider request.

Known Limitations and Deferred Work

• 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.
• No failure rollback — a reload that fails leaves the entry FAILED and visible in the loader status projection; the previous bundle is not restored automatically.
• Graph rev is not refreshed by rebuilt frames — the stale rev is harmless because the bundle endpoint serves no-cache; only reconnect refreshes it.