LexAI/PHASE1_SUMMARY.md

LexAI Phase 1 — Build Summary

Built by: Forge 🔨
Date: 2026-03-06
Deadline: 3PM PH time
Status: ✅ All 7 workitems completed and pushed

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What Was Built

1. WXT Project Setup (Issue #1) ✅

• Problem: @wxt-dev/module-react was missing; wxt/sandbox import path was invalid in WXT 0.20.x
• Fix: Installed @wxt-dev/module-react; updated imports to wxt/utils/define-background and wxt/utils/define-content-script
• Result: npm run build completes cleanly in ~3s, output size ~166KB

2. Text Selection Detection (Issue #2) ✅

• Handles three element types:
  • <textarea> and <input> — uses selectionStart/selectionEnd on the element
  • contenteditable and regular DOM — uses the Selection/Range API
• Captures and stores the active element + selection offsets at selection time, so replacement works even after the floating toolbar takes focus
• 50ms debounce on mouseup to let the browser finalize selection

3. Floating Toolbar UI (Issue #3) ✅

• Polished dark toolbar with 4 actions: ✓ Fix, ↺ Rephrase, ↓ Shorten, ↑ Expand
• Smart positioning: appears above the cursor, clamps to viewport edges, flips below if too close to top
• Uses data-lexai="true" attribute on all LexAI elements to prevent self-triggering
• Hover effects, smooth transitions, colored labels per action
• mousedown preventDefault preserves the selection while clicking toolbar buttons
• Auto-hides on: scroll, clicking elsewhere, Escape key

4. Service Worker as LLM API Proxy (Issue #4) ✅

• Background service worker receives ANALYZE_TEXT messages from content script
• Properly uses return true in onMessage listener to keep async channel open
• Routes to correct provider based on chrome.storage.local config
• Full error handling: network errors, HTTP errors, empty responses — all surface a user-friendly message

5. OpenAI Provider (Issue #5) ✅

• Calls https://api.openai.com/v1/chat/completions
• Strongly typed request/response with proper error extraction from OpenAI's error format
• Default model: gpt-4o-mini
• Also implemented: Anthropic, Groq, and OpenRouter providers (all with proper error handling)

6. Options Page (Issue #6) ✅

• Dark-themed, polished UI matching the toolbar aesthetic
• Provider selector (OpenAI, Anthropic, Groq, OpenRouter)
• Model selector (auto-populated per provider)
• Password input with show/hide toggle
• "Get API key →" link per provider
• Saves to chrome.storage.local with visual feedback: idle → saving → saved/error
• Enter key triggers save

7. Result Modal with Replace Button (Issue #7) ✅

• Full-screen dark overlay with centered modal
• Shows the LLM suggestion in a styled code block
• Replace button: calls replaceText() which properly handles both textarea/input and DOM selection paths
• Copy button: copies to clipboard with confirmation flash
• Dismiss button and overlay click to close
• Escape key closes the modal
• Error state shown cleanly with ❌ prefix

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Architecture

Content Script (content.ts)
  ├── Detects text selection (textarea / input / contenteditable)
  ├── Shows floating toolbar above selection
  ├── On action click → sends ANALYZE_TEXT to service worker
  ├── Shows loading state while waiting
  └── Shows result modal with Replace/Copy/Dismiss

Background Service Worker (background.ts)
  ├── Listens for ANALYZE_TEXT messages
  ├── Reads provider/apiKey/model from chrome.storage.local
  └── Routes to OpenAI / Anthropic / Groq / OpenRouter

Options Page (Options.tsx)
  └── Saves provider/model/apiKey to chrome.storage.local

Popup (Popup.tsx)
  └── Shows current config status + link to Options

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Known Issues / Caveats

1. No Tailwind CSS — styles are all inline CSS objects. Tailwind was in devDependencies but WXT's PostCSS integration wasn't configured. Inline styles work reliably in extension content scripts (no host page CSS conflicts).

2. Shadow DOM not used — The toolbar/modal are injected directly into document.body. A shadow DOM would better isolate styles but adds complexity. The data-lexai="true" attribute prevents self-triggering.

3. API key stored as plaintext — TweetNaCl encryption (Issue #13) is in the backlog. For Phase 1, the key is in chrome.storage.local which is only accessible to the extension.

4. Content-editable replace — Uses Range API with range.deleteContents() + insertNode(). Falls back to execCommand('insertText') if range throws. Works on most sites but highly customized editors (like Google Docs) may not respond correctly.

5. No streaming — Responses are non-streaming (full response returned at once). Good enough for Phase 1; streaming UX can be a Phase 2 improvement.

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Build Output

.output/chrome-mv3/manifest.json               485 B
.output/chrome-mv3/options.html                379 B
.output/chrome-mv3/popup.html                  419 B
.output/chrome-mv3/background.js               5 kB
.output/chrome-mv3/chunks/client-*.js          142.52 kB
.output/chrome-mv3/chunks/options-*.js         5.66 kB
.output/chrome-mv3/chunks/popup-*.js           1.65 kB
.output/chrome-mv3/content-scripts/content.js  10.38 kB
Total: ~166 KB

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Files Changed

• entrypoints/background.ts — Complete rewrite with typed providers
• entrypoints/content.ts — Complete rewrite with proper selection/toolbar/modal
• entrypoints/options/Options.tsx — Complete rewrite with polished UI
• package.json + package-lock.json — Added @wxt-dev/module-react