docs: update specification to use TypeScript frontend

- Replace 'Vanilla JavaScript' with 'TypeScript' in frontend requirements
- Update flake.nix to use nodejs package instead of tailwindcss
- Clarify testing requirements to cover both frontend and backend
- Fix punctuation in evaluation checklist
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2026-01-31 08:06:29 -05:00
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SPEC.md
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## Overview
Build a WYSIWYG markdown editor with save functionality consisting of a Go backend and vanilla JavaScript frontend with Tailwind CSS.
Beyond the listed features, no authentication, user accounts, collaborative editing, or version history are required.
Build a markdown editor with preview: Go backend + React/TypeScript frontend with Tailwind CSS.
**Out of scope:** authentication, user accounts, collaborative editing, version history.
## Backend (Go)
### Requirements
- Standard HTTP server + Cobra for CLI
- CRUD REST API for markdown files
- Store files on disk (flat structure, `.md` files only)
- Errors return 4xx/5xx + JSON with `error` field
- Comprehensive logging using logrus
- Use Go with standard HTTP server
- Use Cobra library for CLI argument parsing
- Implement CRUD operations for markdown files:
- Create: Add new markdown files
- Read: Retrieve/View markdown files
- Update: Edit existing markdown files
- Delete: Remove markdown files
- Store markdown files on disk in a specified directory
- The server must handle concurrent requests safely; the last successful write wins
- Markdown file names are case-sensitive and must end in `.md`. Illegal characters for the current OS must be rejected with 400 Bad Request
- Directory structure under `--data-dir` is flat: every `.md` file is a sibling; sub-directories are ignored
### CLI Flags
### CLI Options
- `--data-dir`: Storage path (default: `./data`)
- `--port`: Server port (default: `8080`)
- `--host`: Bind address (default: `127.0.0.1`)
The application must support the following CLI flags:
## Frontend (React + TypeScript + Tailwind)
- `--data-dir`: Path to the directory where markdown files will be stored (default: `./data`)
- `--port`: Port number to run the HTTP server on (default: `8080`)
- `--host`: Host address to bind to (default: `127.0.0.1`)
Cobra must generate help text for `--help` and `-h` that includes defaults.
### API Implementation
- Design and implement appropriate REST endpoints for CRUD operations
- Handle error responses appropriately
- Validate inputs appropriately
- Any operation that fails must return an HTTP 4xx/5xx code and a JSON body containing at least an `error` string
## Frontend (Vanilla JavaScript + Tailwind CSS)
### Requirements
- Vanilla JavaScript (no frameworks)
- Tailwind CSS for styling
- Single-page application interface
- No build step except running the Tailwind CLI once to generate the CSS file; runtime must work in a current Chrome/Edge/Firefox without polyfills
### Features
#### Markdown Editor
- Split-view or toggleable view with:
- Edit pane: Textarea for markdown input
- Preview pane: Rendered markdown preview
- Real-time preview updates
- Render markdown with GitHub-Flavored-Markdown (GFM) semantics
#### Theme Support
Three theme modes:
- **Dark**: Dark color scheme
- **Light**: Light color scheme
- **System**: Follows system preference
Theme switching requirements:
- Auto-detect system preference on load (prefers-color-scheme)
- Manual theme switcher with three options: Dark, Light, System
- Persist theme preference in localStorage under the key `wysiwyg-theme`
- Update theme immediately when changed
- Respect system theme changes when in "System" mode
#### File Management UI
- List all markdown files
- Create new files
- Open existing files for editing
- Save changes
- Delete files
#### Responsive Design
- Works on desktop and mobile
- Responsive layout using Tailwind classes
- Markdown editor with live GFM preview
- File management: list, create, open, save, delete
- Three themes (Dark, Light, System) with switcher
- Responsive (desktop + mobile)
## Development Environment
The repository root contains a `flake.nix` locked to `github:NixOS/nixpkgs/nixos-25.11`.
`nix develop` has already been executed; the resulting shell provides:
`flake.nix` (locked to `nixos-25.11`) provides: go, gopls, golangci-lint, eslint, nodejs, gnumake, lsof
- go, gopls, golangci-lint
- tailwindcss
- gnumake
**Do not modify flake.**
You must not modify the flake or add packages outside this environment.
## Testing (TDD)
## General Requirements
- **All tests must pass**
- Single command to run tests
- Backend: demonstrate CRUD round-trip + static asset serving
- Frontend: verify core functionality
- No database - use file system
- Minimal dependencies
- Clean, maintainable code
- Proper error handling
## Milestones
## Testing & Observability
### Backend (6 milestones)
- Provide at least one automated test (unit, integration, or end-to-end) that can be run with a single command (`go test`, `make test`, etc.).
- The test must demonstrate that a markdown file can be created, read, updated, and deleted through the REST endpoints.
- On start-up the server must log its bound address in the format `listening on <host>:<port>` so evaluators can script against it.
**B1: CLI & Server Setup**
- Cobra CLI with --data-dir, --port, --host flags
- HTTP server with basic routing
## Evaluation Checklist
**B2: CRUD API**
- REST endpoints for markdown files (GET, POST, PUT, DELETE)
- JSON error responses (4xx/5xx)
Evaluation will check:
(1) CLI starts with defaults,
(2) CRUD round-trip,
(3) theme switch & persistence,
(4) responsive layout on 320 px and 1920 px,
**B3: File Storage**
- Read/write .md files to disk
- Flat file structure
**B4: Logging**
- Comprehensive logrus logging for all operations
**B5: Static Assets**
- Serve frontend build files
**B6: Backend Tests**
- CRUD round-trip tests
- Static asset serving tests
### Frontend (6 milestones)
**F1: Project Setup**
- React + TypeScript + Tailwind configured
**F2: File Management UI**
- List, create, open, save, delete markdown files
**F3: Editor & Preview**
- Markdown editor with live GFM preview
**F4: Theme System**
- Dark/Light/System themes
- Theme switcher and persistence
**F5: Responsive Design**
- Works at 320px and 1920px
**F6: Frontend Tests**
- Core functionality tests (editor, file operations, themes)
### Integration (1 milestone)
**I1: End-to-end**
- Full CRUD workflow test from frontend to backend
## Evaluation
1. CLI starts with defaults
2. CRUD works end-to-end
3. Static assets are properly served
4. Theme switch & persistence
5. Responsive at 320px and 1920px