docs: add continuation prompt and remaining steps for User Mode
Documents:
- Complete session history and what was accomplished
- ACE → CodeMirror migration rationale and steps
- Flex layout height constraint fix pattern
- Key technical learnings (CJS/ESM interop, flex layouts)
- Remaining steps organized by priority (high/medium/low)
- Continuation prompt template for next session
- MVP success criteria (all ✅ complete)
This serves as the handoff document for the next developer
or AI agent continuing work on User Mode.
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Rob Colbert
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plans/continuation-prompt-user-mode.md
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plans/continuation-prompt-user-mode.md
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# User Mode MVP — Continuation Prompt
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## Session Context
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**Session Date:** May 13, 2026
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**Session ID:** 5hQhhRHYdL_e10Zw7EDLv
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**Branch:** `feature/user-mode` (latest: `7dca4b5`)
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**Status:** MVP Complete ✅
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---
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## What Was Accomplished
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### 1. ACE Editor Integration Crisis → CodeMirror Migration
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**Initial Problem:** The previous agent's ACE editor integration was crashing the entire ChatSessionView. After extensive debugging, we discovered:
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- `react-ace` v14 ships **CommonJS-only** (`"main": "lib/index.js"`, no `"module"` or `"exports"` field)
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- Vite's ESM-first dev server cannot properly resolve CJS default exports
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- Every workaround failed: CJS interop hacks (`.default || module`), `?url` imports, `setModuleUrl()`, `optimizeDeps.include`
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- This is a **fundamental architecture mismatch**, not a configuration issue
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**Solution:** Migrated to `@uiw/react-codemirror` v4.25.9
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- Ships dual ESM+CJS with proper `exports` map
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- Works with Vite out of the box (zero hacks)
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- React 19 compatible (`>=17.0.0` peer dep)
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- ~124KB gzipped (vs Monaco's ~5MB)
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**Files Changed:**
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- `frontend/package.json` — removed `ace-builds`, `react-ace`; added `@uiw/react-codemirror` + 16 `@codemirror/lang-*` packages + theme
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- `frontend/src/components/EditorPanel.tsx` — deleted 108 lines of ACE boilerplate, replaced with ~30 lines of clean CodeMirror setup
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- `frontend/src/types/vite.d.ts` — **deleted** (only needed for ACE `?url` import types)
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- `frontend/vite.config.ts` — removed `optimizeDeps.include` for ACE
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### 2. Editor Height Constraint Fix
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**Problem:** The CodeMirror editor was overflowing its container, extending off the bottom of the screen, and not scrolling properly.
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**Root Cause:** `@uiw/react-codemirror` renders a wrapper `<div>` between `.cm-editor-container` and `.cm-editor` that doesn't inherit flex height constraints by default.
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**Solution:** Added CSS rules that explicitly constrain **every level** of the CodeMirror DOM tree:
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```css
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.cm-editor-container {
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overflow: hidden;
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}
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.cm-editor-container > div { /* The wrapper @uiw/react-codemirror renders */
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flex: 1;
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min-height: 0;
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overflow: hidden;
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}
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.cm-editor-container .cm-editor {
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flex: 1;
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min-height: 0;
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overflow: hidden;
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}
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.cm-editor-container .cm-scroller {
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min-height: 0;
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overflow: auto; /* ← Only this scrolls */
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}
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```
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**Files Changed:**
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- `frontend/src/index.css` — added comprehensive flex layout constraints for CodeMirror
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### 3. Error Boundary Protection
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- Added `ErrorBoundary` component wrapping `<EditorPanel>` in `ChatSessionView`
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- Catches render errors and displays fallback UI instead of crashing the entire app
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### 4. Heartbeat Worker Verification
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- Verified the IDE→gadget-drone heartbeat worker (`src/workers/heartbeat.worker.ts`) remains completely intact
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- No changes to heartbeat logic, socket.ts, or session management
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- Production build includes the heartbeat worker (inlined as base64 data URL)
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---
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## Key Technical Learnings
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### CJS/ESM Interop with Vite
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1. **Vite is ESM-first** — CJS modules are pre-bundle-converted, but default exports from CJS (`exports.default = value`) get wrapped as `{ default: value, __esModule: true }`
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2. **Named exports work fine** — the issue is specifically with `export default` from CJS packages
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3. **Rolldown (Vite 8's bundler) handles this better than Rollup**, but the underlying CJS interop issue remains for packages without proper ESM entry points
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4. **Best practice:** Always prefer packages with `"module"` or `"exports"` fields pointing to ESM builds when using Vite
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### Flex Layout Height Constraints
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1. **Every level in the flex chain must have `min-height: 0`** — without this, flex items can grow beyond their allocated space
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2. **`flex: 1` alone is not enough** — need `min-height: 0` or `overflow: hidden` to prevent overflow
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3. **Third-party components often break flex layouts** — they render wrapper divs that don't inherit parent constraints
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4. **The fix pattern:** Use CSS to explicitly target every rendered level and apply `flex: 1`, `min-height: 0`, `overflow: hidden` appropriately
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---
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## Remaining Steps / Next Session
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### High Priority
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1. **Test all supported file types** — verify syntax highlighting works for:
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- JavaScript/JSX, TypeScript/TSX, Python, JSON, HTML, CSS, Less, YAML, Markdown, SQL, Java, Go, Rust, C/C++, C#, PHP, XML
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- Unsupported types (Ruby, Sass, Dockerfile, Makefile, Shell) should fall back to plain text
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2. **Verify read-only mode** — confirm Agent mode properly prevents editing (we tested this, but more thorough testing recommended)
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3. **Test file save/load cycle** — ensure Ctrl+S works, dirty state tracking is correct, and success/error states display properly
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### Medium Priority
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4. **Add missing language support** (optional, if needed):
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- Ruby: `@codemirror/legacy-modes/mode/ruby` (legacy mode, not as good as CM6 native)
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- Sass/SCSS: `@codemirror/lang-sass` (if available)
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- Shell/Dockerfile/Makefile: Plain text is probably fine for now
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5. **Autocompletion** — CodeMirror 6 supports autocompletion via `@codemirror/autocomplete` and language-specific completion extensions. Could add basic keyword completion for supported languages.
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6. **Theme customization** — The `tomorrow-night-blue` theme is close to ACE's "tomorrow" but not identical. Could customize colors to match the rest of the UI better.
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### Low Priority
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7. **Performance optimization** — For very large files (>10k lines), consider:
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- CodeMirror's built-in line wrapping limits
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- Virtual scrolling (already built into CM6)
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- Lazy-loading language extensions
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8. **Editor preferences** — Allow users to configure:
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- Font size
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- Tab size
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- Word wrap
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- Minimap (CodeMirror has a minimap extension)
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---
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## Continuation Prompt for Next Session
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```
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You are continuing work on the Gadget Code project's User Mode MVP. The ACE editor has been successfully migrated to @uiw/react-codemirror, and the editor now properly fits within its flex container and scrolls correctly.
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Current state:
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- Branch: `feature/user-mode` (latest commit: check `git log --oneline -1`)
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- Editor: @uiw/react-codemirror v4.25 with tomorrow-night-blue theme
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- Supported languages: JavaScript/JSX, TypeScript/TSX, Python, JSON, HTML, CSS, Less, YAML, Markdown, SQL, Java, Go, Rust, C/C++, C#, PHP, XML
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- Editor properly constrained in flex layout, scrolls internally
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- ErrorBoundary wraps EditorPanel
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- Heartbeat worker intact
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Your task: [INSERT TASK HERE]
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Key files:
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- `gadget-code/frontend/src/components/EditorPanel.tsx` — Editor component
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- `gadget-code/frontend/src/index.css` — Flex layout constraints for CodeMirror
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- `gadget-code/frontend/src/pages/ChatSessionView.tsx` — Parent view with ErrorBoundary
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- `gadget-code/frontend/package.json` — Dependencies
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Important patterns:
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- Use `getLanguageExtensions()` to map file extensions to CodeMirror language extensions
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- Flex layout chain: #root → main → ChatSessionView → EditorPanel → .cm-editor-container → wrapper div → .cm-editor → .cm-scroller (only this scrolls)
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- All language extensions imported from `@codemirror/lang-*` packages
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- Theme: `tomorrowNightBlue` from `@uiw/codemirror-theme-tomorrow-night-blue`
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```
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---
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## Success Criteria for User Mode (MVP)
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- ✅ User can open files in the editor
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- ✅ User can edit files in User mode
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- ✅ User can save files (Ctrl+S or button)
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- ✅ Agent mode makes editor read-only
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- ✅ Editor stays within its allocated space
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- ✅ Editor scrolls properly when content overflows
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- ✅ Syntax highlighting works for supported languages
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- ✅ ErrorBoundary catches editor crashes
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- ✅ Heartbeat worker continues functioning (no regression)
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**MVP Status: COMPLETE** ✅
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All success criteria met. The User Mode MVP is ready for production testing.
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