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Phase 10 — Polish + Delete Legacy Design

Companion to the parent plan: docs/superpowers/plans/2026-06-05-react-ui-redesign.md (Phase 10 is sketched at high level; this spec locks architecture, file map, deletion targets, and version strategy.)

Date: 2026-06-06 Phase: 10 of 10 (React + shadcn/ui UI redesign) — FINAL Tag (on completion): v5.0.0 (the first release tag, all prior phases were phase-N-* working tags)

1. Goal & Non-Goals

Goal: Finalize the React UI redesign. Decompose the legacy 146KB src/main.js into a feature-first modular structure under src/main/, remove the legacy vanilla-JS renderer and all dead IPC bridges, then ship v5.0.0 with a CHANGELOG.

Non-goals (Phase 10):

  • Adding new features (Phases 1-9 shipped all of them)
  • A full main-process test suite (the existing main process is largely untested; adding tests is Phase 11+)
  • Backwards compat shims for the legacy renderer
  • Renderer-side refactor (already done)
  • Migrating the renderer build pipeline further (vite configs are in place)

Success criteria:

  • src/main.js is gone; src/main/index.js is the new entrypoint
  • package.json#main points to src/main/index.js
  • All 12 legacy renderer files are deleted
  • All 9 dead IPC channels are removed from preload.js and main.js
  • src/index.html is reduced to ~50 lines (just the Vite bootstrap)
  • package.json#version is 5.0.0
  • CHANGELOG.md exists in Keep a Changelog 1.1.0 format
  • git grep -E "renderer\.js|command-palette|print-preview|welcome\.js|zen-mode|wordTemplate|ascii-generator|table-generator|styles\.css" returns zero results
  • All 305 tests still pass
  • npx vite build --config vite.renderer.config.ts succeeds
  • npx electron . launches and main window renders
  • Tag v5.0.0 pushed to origin

2. Target Architecture

2.1 src/main/ (feature-first decomposition)

src/main/
├── index.js              # entrypoint: bootstraps store, app, window, ipc
├── store.js              # electron-store wrapper (preferences + wordTemplatePath)
├── ipc.js                # ipcMain.handle registration (composes from modules)
├── files/
│   ├── index.js          # file ops facade (read/write/list/pickFolder/pickFile)
│   ├── search.js         # recursive regex search (used by find-in-files)
│   ├── git.js            # git status porcelain parser
│   └── binary.js         # writeBuffer helper (Uint8Array → file)
├── menu/
│   ├── index.js          # buildMenu() — composes the app menu
│   └── items.js          # individual menu items (File, Edit, View, etc.)
├── window/
│   ├── index.js          # createMainWindow ONLY (createAsciiWindow/createTableWindow are DEAD)
│   └── state.js          # window state persistence
├── word-template/
│   ├── index.js          # WordTemplateExporter facade
│   ├── parser.js         # .dotx parsing
│   ├── converter.js      # markdown → docx
│   └── apply.js          # apply template styles to converted docx
└── utils/
    ├── paths.js          # path helpers
    ├── logger.js         # structured logging
    └── download.js       # tool downloader

Module rules:

  • Each file has one clear responsibility (no god files; CLAUDE.md says >300 lines is the cap)
  • index.js is the public face of a folder; deeper files are private
  • src/main/index.js (top-level) wires everything together
  • Cross-folder imports go through index.js, not directly to internals

2.2 Entry point change

Before:

// package.json
"main": "src/main.js"

After:

// package.json
"main": "src/main/index.js"

The new src/main/index.js runs the same app.whenReady().then(...) flow that the current src/main.js does, but composes the decomposed modules.

2.3 What becomes dead code (removed during decomposition)

When the legacy renderer files are deleted, these main-process functions become orphaned and are removed too:

Function File Why dead
createAsciiWindow() src/main/window/index.js Loads deleted src/ascii-generator.html
createTableWindow() src/main/window/index.js Loads deleted src/table-generator.html
ipcMain.on('open-ascii-generator', ...) src/main/index.js (after decomposition) Replaced by React <AsciiGeneratorDialog>
ipcMain.on('open-table-generator', ...) src/main/index.js (after decomposition) Replaced by React <TableGeneratorDialog>
webContents.send('print-preview') src/main/menu/items.js Replaced by React <PrintPreview>
webContents.send('print-preview-styled') src/main/menu/items.js Replaced by React <PrintPreview>
webContents.send('toggle-command-palette') src/main/menu/items.js Replaced by useCommandStore
require('./wordTemplateExporter') src/main/index.js (after decomposition) Replaced by src/main/word-template/ + renderer-side lib/docx-export.ts

3. Legacy Deletion Map

3.1 Files to delete from src/ (12 files, ~14,426 lines)

File Size Lines Replaced by
src/renderer.js 213KB 5319 src/renderer/ (Phases 1-9)
src/styles.css 74KB 3723 src/renderer/index.css + Tailwind
src/styles-modern.css 71KB 2625 Tailwind + shadcn/ui
src/styles-concreteinfo.css 21KB 969 Tailwind theme tokens
src/styles-sidebar.css 9.7KB 304 <Sidebar> component
src/styles-zen.css 2.1KB 102 Zen mode in AppShell
src/styles-welcome.css 2.2KB 24 Welcome dialog
src/fonts.css 1.8KB (imported elsewhere) Tailwind font config
src/command-palette.js (small) 109 useCommandStore
src/print-preview.js (small) 138 <PrintPreview>
src/welcome.js (small) 78 <Welcome> modal
src/zen-mode.js (small) 292 use-zen-mode hook + AppShell
src/wordTemplateExporter.js (small) 743 src/main/word-template/ + renderer lib/docx-export.ts
src/ascii-generator.html 34KB (HTML) <AsciiGeneratorDialog>
src/table-generator.html 18KB (HTML) <TableGeneratorDialog>

Total: 12 JS/CSS/HTML files = 14,426 lines / ~445KB

Note: src/index.html is NOT deleted — it's rewritten to a minimal Vite bootstrap (~50 lines). See §4.

3.2 Dead IPC channels to remove from src/preload.js

  • toggle-command-palette (line 238)
  • open-ascii-generator (line 89)
  • open-table-generator (line 92)
  • print-preview (line 173)
  • print-preview-styled (line 174)
  • show-table-generator (line 180)
  • show-ascii-generator-window (line 217)
  • show-ascii-generator (line 218)
  • show-table-generator-window (line 221)

And from the exposed API surface:

  • openAscii: () => ipcRenderer.send('open-ascii-generator') (line 445)
  • openTable: () => ipcRenderer.send('open-table-generator') (line 446)

9 channel names + 2 API entries to remove.

3.3 Legacy references in src/index.html (16 places)

  • <link rel="stylesheet" href="styles.css"> (line ~6)
  • <link rel="stylesheet" href="styles-welcome.css"> (line ~7)
  • <div id="print-preview-overlay" class="modal hidden" ...> block (~10 lines)
  • <div class="command-palette-overlay hidden" id="command-palette-overlay"> block (~5 lines)
  • <script src="renderer.js"></script> (final script tag)

All of these are removed. The rewritten src/index.html is just:

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Markdown Converter</title>
  </head>
  <body>
    <div id="root"></div>
    <script type="module" src="/src/renderer/main.tsx"></script>
  </body>
</html>

(Confirm exact entrypoint path with src/renderer/ structure; this is the standard Vite + React 19 shape.)

3.4 Main process rewiring

  • Remove require('./wordTemplateExporter') from main entrypoint
  • Remove webContents.send('print-preview*') and webContents.send('toggle-command-palette') from menu items
  • Remove ipcMain.on('open-ascii-generator', ...) and ipcMain.on('open-table-generator', ...) handlers
  • Remove asciiGeneratorWindow and tableGeneratorWindow global state (and any references to loadFile(...ascii-generator.html) / loadFile(...table-generator.html))

4. src/index.html Rewrite

The current src/index.html is 1667 lines of legacy markup. The new version is minimal:

<!doctype html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Markdown Converter</title>
  </head>
  <body>
    <div id="root"></div>
    <script type="module" src="/src/renderer/main.tsx"></script>
  </body>
</html>

Vite handles the rest. The renderer's <App /> is mounted in main.tsx which is the Vite entrypoint.

5. Version Bump + CHANGELOG

5.1 package.json

-  "version": "4.4.2",
+  "version": "5.0.0",

Major version bump because the legacy renderer removal is a breaking change for anyone who had plugins/integrations pointing at src/renderer.js.

5.2 CHANGELOG.md (new file, Keep a Changelog 1.1.0 format)

# Changelog

All notable changes to markdown-converter will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [5.0.0] - 2026-06-06

### Added
- **Complete React 19 + Vite + TypeScript renderer** replacing the legacy vanilla-JS UI
- Native macOS/Windows/Linux menus with command palette and keyboard shortcuts
- Settings sheet (5 tabs: editor, theme, keybindings, advanced, about)
- Modal layer with 13 modal kinds (export PDF/DOCX/HTML/Word, batch, settings, about, welcome, confirm, ASCII gen, table gen, find in files)
- 10 advanced tools: ASCII generator, table generator, Word export, find-in-files, REPL, print preview, zen mode, minimap, breadcrumbs-with-symbols, git status
- Sonner toast notifications at 4 wire points
- 3 mount strategies: ModalLayer dialogs, App.tsx overlays, editor/sidebar integrations
- `ipc.file.writeBuffer` for renderer-side binary output
- `ipc.file.search` (recursive regex), `ipc.file.gitStatus`, `ipc.print.show`, `ipc.app.showSaveDialog`
- 305 unit + integration tests (vitest + React Testing Library)
- Per-package @radix-ui primitives
- shadcn/ui (new-york style) primitives

### Changed
- **BREAKING**: Renderer is now React-only.
- Main process decomposed from 146KB `src/main.js` into feature-first modules under `src/main/`
- `src/index.html` reduced from 1667 to ~50 lines
- IPC contract: handlers throw, `safeCall` catches → `{ ok, error }`
- Settings store: `useSettingsStore` (zustand persist with zod)
- Modal state: `useAppStore.modal: ModalState` discriminated union

### Removed
- `src/renderer.js` (legacy vanilla-JS renderer, 5319 lines)
- 7 legacy stylesheets (styles.css, styles-modern.css, styles-concreteinfo.css, styles-sidebar.css, styles-zen.css, styles-welcome.css, fonts.css)
- 5 legacy scripts (command-palette.js, print-preview.js, welcome.js, zen-mode.js, wordTemplateExporter.js)
- 2 legacy HTMLs (ascii-generator.html, table-generator.html)
- 9 dead IPC channels (toggle-command-palette, open-*/show-* ascii/table, print-preview*)

6. Task Decomposition

10 tasks (each independently verifiable, one feature per commit, no bundling):

  1. Decompose main.js — src/main/files/ (file ops facade, search, git, binary)
  2. Decompose main.js — src/main/menu/ (buildMenu + items, with dead sends removed)
  3. Decompose main.js — src/main/window/ (createMainWindow ONLY — ascii/table windows removed)
  4. Decompose main.js — src/main/word-template/ (WordTemplateExporter split into parser/converter/apply)
  5. Decompose main.js — src/main/utils/ + store.js + ipc.js + index.js (glue + new entrypoint)
  6. Trim preload.js — remove 9 dead IPC channels + 2 exposed API entries
  7. Delete legacy renderer files (12 files: renderer.js, 7 styles, fonts.css, 4 scripts, 2 htmls)
  8. Rewrite src/index.html — minimal Vite bootstrap (~50 lines)
  9. Bump package.json version to 5.0.0 + write CHANGELOG.md
  10. Final verification + tag v5.0.0 (build, tests, grep, electron smoke)

Tasks 1-5 are subagent-driven (decomposition is mechanical given a clear target structure). Tasks 6-9 are direct edits. Task 10 is a verification gate.

7. Verification Strategy

Per task:

  • After each decomposition step: npx vitest run (305 still green)
  • After main.js decomposition: npx electron . smoke — app starts, opens a file
  • After deletions: git grep -E "renderer\.js|command-palette|print-preview|welcome\.js|zen-mode|wordTemplate|ascii-generator|table-generator|styles\.css" returns ZERO results

Final (Task 10):

  • npx vitest run — 305 passing
  • npx vite build --config vite.renderer.config.ts — succeeds
  • npx vite build --config vite.preload.config.ts — succeeds
  • npx electron . — app launches, main window renders
  • Manual smoke: open a .md file, edit it, export to PDF/DOCX, use the command palette
  • git tag -a v5.0.0 -m "..." and git push origin v5.0.0

8. Risks & Open Questions

Risks:

  • Decomposition regressions. Splitting a 146KB main.js into 7+ files has surface area for missed imports / circular deps. Mitigation: tests stay green; electron smoke after each step.
  • Hidden legacy references. git grep won't catch references inside minified bundles or in node_modules. Mitigation: vite build will fail if there's a dangling import.
  • src/main/index.js entrypoint change. Anything in the build pipeline (electron-builder, scripts) that hardcodes src/main.js needs to be updated. Mitigation: grep all of package.json, scripts/, vite.*.config.ts for main.js.

Open questions (resolved during brainstorming):

  • Main process scope → Full rewrite
  • Folder shape → Feature-first
  • IPC migration → Delete dead channels
  • Version strategy → v5.0.0 with Keep a Changelog format
  • Order of work → Decompose first, delete last

9. Out of Scope (deferred to Phase 11+)

  • Main process test suite
  • Renderer-side further refactor
  • New features
  • Migration to tauri (separate plan in docs/plans/2026-03-15-react-tauri-pwa.md)

10. Success Criteria

Phase 10 is complete when:

  • All 10 tasks are committed, one per commit, no bundling
  • src/main/index.js is the new entrypoint
  • All 12 legacy files are deleted
  • All 9 dead IPC channels are removed
  • package.json#version is 5.0.0, package.json#main is src/main/index.js
  • CHANGELOG.md exists with a complete v5.0.0 entry
  • 305 tests still pass
  • npx vite build succeeds for both renderer and preload configs
  • npx electron . launches and the app works end-to-end
  • git grep for legacy references returns zero results
  • Tag v5.0.0 is created and pushed to origin
  • Phase 10 is the LAST phase of the React UI redesign
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