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11-prompt-input-and-optimistic-state.md

11-prompt-input-and-optimistic-state.md 4.1 KB
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Prompt input and optimistic-state consolidation

Decompose prompt-input and unify optimistic message mutations.

Summary

packages/app/src/components/prompt-input.tsx has already been partially decomposed and is now ~1,391 LOC. Editor DOM helpers, attachments, history, and submit flow were extracted into packages/app/src/components/prompt-input/*.ts, but optimistic mutation ownership and some UI/controller responsibilities are still split across call sites. This spec continues from that refactored baseline.

Goals

  • Split prompt-input.tsx into modular UI + controller pieces.
  • Centralize optimistic message add/remove behavior behind sync-context APIs.
  • Remove unsafe cast path around optimistic parts (as unknown as Part[]).
  • Keep existing prompt UX and submission semantics unchanged.

Non-goals

  • No redesign of prompt input visuals.
  • No changes to session protocol or backend APIs.
  • No changes to unrelated page modules (pages/session.tsx, pages/layout.tsx).

Parallel ownership (important)

This workstream owns:

  • packages/app/src/components/prompt-input.tsx
  • New files under packages/app/src/components/prompt-input/**
  • packages/app/src/context/sync.tsx (optimistic API surface only)

This workstream must not edit:

  • packages/app/src/pages/session.tsx (spec 09)
  • packages/app/src/pages/layout.tsx (spec 10)
  • packages/app/src/context/global-sync.tsx (spec 12)
  • packages/app/src/context/file.tsx (spec 13)

Current state

  • File size: ~1,391 LOC for prompt-input.tsx.
  • Existing extracted modules:
    • prompt-input/editor-dom.ts
    • prompt-input/attachments.ts
    • prompt-input/history.ts
    • prompt-input/submit.ts
  • Optimistic mutation and request-part casting still need consolidation (including remaining as unknown as Part[] in submit path).
  • Remaining concerns still tightly coupled in prompt-input.tsx:
    • slash/mention UI rendering and keyboard orchestration
    • context pill interactions and focus behavior
    • composition glue across history/attachments/submit

Proposed structure

Build on the existing packages/app/src/components/prompt-input/ modules by adding/further splitting modules such as:

  • use-prompt-composer.ts - state machine for submit/abort/history.
  • build-request-parts.ts - typed request-part construction.
  • slash-popover.tsx - slash command list rendering.
  • context-items.tsx - context pills and interactions.

Keep existing lower-level modules (attachments.ts, editor-dom.ts, history.ts, submit.ts) and narrow their responsibilities where needed.

Add sync-level optimistic APIs (in context/sync.tsx or context/sync-optimistic.ts):

  • session.optimistic.add(...)
  • session.optimistic.remove(...)

Prompt input should call these APIs instead of directly mutating message/part stores.

Phased steps

  1. Extract typed request-part builder (likely from prompt-input/submit.ts) to remove ad hoc casting.
  2. Introduce sync optimistic APIs with current behavior.
  3. Replace remaining direct produce(...) optimistic mutations with optimistic APIs.
  4. Extract remaining UI subtrees (slash popover, context items, toolbar controls).
  5. Extract controller hook and keep route component as composition shell.

Acceptance criteria

  • Optimistic update logic exists in one place only.
  • prompt-input.tsx is significantly smaller (target: under 1,200 LOC).
  • Prompt submit/abort/history behavior remains unchanged.
  • No as unknown as Part[] in optimistic request construction path.

Validation plan

  • Typecheck: bun run typecheck (from packages/app).
  • Targeted e2e checks:
    • e2e/prompt/prompt.spec.ts
    • e2e/prompt/context.spec.ts
    • e2e/prompt/prompt-slash-open.spec.ts
    • e2e/prompt/prompt-mention.spec.ts
  • Manual check:
    • submit with file/image/context attachments
    • abort in-flight turn
    • history up/down restore behavior

Handoff notes

  • Preserve sequence semantics around optimistic insert, worktree wait, send, and rollback.
  • Keep sync optimistic API data-oriented and reusable by future callers.
  • Do not mix this with broader sync/global-sync refactors in the same diff.