Obsidian Local Dev Loop

---
name: obsidian-local-dev-loop
description: |
  Configure Obsidian plugin development with hot-reload and fast iteration.
  Use when setting up development workflow, configuring test vaults,
  or establishing a rapid development cycle.
  Trigger with phrases like "obsidian dev loop", "obsidian hot reload",
  "obsidian development workflow", "develop obsidian plugin".
allowed-tools: Read, Write, Edit, Bash(npm:*), Bash(pnpm:*), Grep
version: 1.0.0
license: MIT
author: Jeremy Longshore <jeremy@intentsolutions.io>
---

# Obsidian Local Dev Loop

## Overview
Set up a fast, reproducible local development workflow for Obsidian plugins with hot-reload and testing.

## Prerequisites
- Completed `obsidian-install-auth` setup
- Node.js 18+ with npm/pnpm
- Code editor with TypeScript support
- Obsidian desktop app

## Instructions

### Step 1: Configure Development Vault
```bash
# Create dedicated development vault structure
mkdir -p ~/ObsidianDev/.obsidian/plugins
mkdir -p ~/ObsidianDev/Test\ Notes

# Create test notes
cat > ~/ObsidianDev/Test\ Notes/Test.md << 'EOF'
# Test Note
This is a test note for plugin development.

## Section 1
Some content here.

## Section 2
More content with [[links]] and #tags.
EOF
```

### Step 2: Link Plugin for Development
```bash
# Navigate to your plugin directory
cd /path/to/my-obsidian-plugin

# Create symlink to development vault
ln -sf "$(pwd)" ~/ObsidianDev/.obsidian/plugins/my-obsidian-plugin

# Verify symlink
ls -la ~/ObsidianDev/.obsidian/plugins/
```

### Step 3: Configure Hot-Reload with BRAT
```markdown
1. In Obsidian, go to Settings > Community plugins
2. Browse and install "BRAT" (Beta Reviewers Auto-update Tester)
3. Enable BRAT plugin
4. BRAT Settings > Enable "Auto-update plugins at startup"
5. Your plugin will auto-reload when main.js changes
```

### Step 4: Configure esbuild for Watch Mode
```javascript
// esbuild.config.mjs
import esbuild from "esbuild";
import process from "process";

const prod = process.argv[2] === "production";

const context = await esbuild.context({
  entryPoints: ["src/main.ts"],
  bundle: true,
  external: ["obsidian", "electron", "@codemirror/*", "@lezer/*"],
  format: "cjs",
  target: "es2018",
  logLevel: "info",
  sourcemap: prod ? false : "inline",
  treeShaking: true,
  outfile: "main.js",
});

if (prod) {
  await context.rebuild();
  process.exit(0);
} else {
  await context.watch();
}
```

### Step 5: Add npm Scripts
```json
{
  "scripts": {
    "dev": "node esbuild.config.mjs",
    "build": "node esbuild.config.mjs production",
    "test": "jest",
    "lint": "eslint src/",
    "version": "node version-bump.mjs && git add manifest.json versions.json"
  }
}
```

### Step 6: Start Development
```bash
# Terminal 1: Start watch mode
npm run dev

# Terminal 2: Run tests in watch mode (if configured)
npm test -- --watch

# In Obsidian:
# 1. Open development vault (~/ObsidianDev)
# 2. Enable your plugin
# 3. Edit code - plugin auto-reloads
```

## Output
- Dedicated development vault with test data
- Symlinked plugin for instant updates
- Hot-reload via BRAT or file watching
- Watch mode build with source maps
- Fast iteration cycle

## Error Handling
| Error | Cause | Solution |
|-------|-------|----------|
| Plugin not reloading | BRAT not configured | Install and enable BRAT plugin |
| Symlink not working | Permission denied | Run as admin (Windows) |
| Build not triggering | Watch mode not started | Run `npm run dev` |
| Source maps not working | Disabled in config | Set `sourcemap: "inline"` |
| TypeScript errors | Missing types | Run `npm install` |

## Examples

### Automated Plugin Reload Script
```typescript
// src/dev-utils.ts
import { Plugin } from 'obsidian';

export function reloadPlugin(app: any, pluginId: string) {
  const plugins = app.plugins;
  return plugins.disablePlugin(pluginId)
    .then(() => plugins.enablePlugin(pluginId));
}

// Add command in main.ts (dev only):
if (process.env.NODE_ENV !== 'production') {
  this.addCommand({
    id: 'reload-plugin',
    name: 'Reload This Plugin (Dev)',
    callback: () => {
      (this.app as any).plugins.disablePlugin(this.manifest.id)
        .then(() => (this.app as any).plugins.enablePlugin(this.manifest.id));
    }
  });
}
```

### Debug Logging Utility
```typescript
// src/debug.ts
const DEBUG = process.env.NODE_ENV !== 'production';

export function debug(...args: any[]) {
  if (DEBUG) {
    console.log('[MyPlugin]', ...args);
  }
}

export function debugTime(label: string) {
  if (DEBUG) console.time(`[MyPlugin] ${label}`);
  return () => {
    if (DEBUG) console.timeEnd(`[MyPlugin] ${label}`);
  };
}
```

### VSCode Tasks
```json
// .vscode/tasks.json
{
  "version": "2.0.0",
  "tasks": [
    {
      "label": "dev",
      "type": "npm",
      "script": "dev",
      "isBackground": true,
      "problemMatcher": {
        "pattern": {
          "regexp": "^(.*):(\\d+):(\\d+): error: (.*)$",
          "file": 1,
          "line": 2,
          "column": 3,
          "message": 4
        },
        "background": {
          "activeOnStart": true,
          "beginsPattern": ".",
          "endsPattern": "build finished"
        }
      }
    }
  ]
}
```

## Resources
- [BRAT Plugin](https://github.com/TfTHacker/obsidian42-brat)
- [esbuild Documentation](https://esbuild.github.io/)
- [Obsidian Plugin Development Docs](https://docs.obsidian.md/Plugins/Getting+started/Development+workflow)

## Next Steps
See `obsidian-sdk-patterns` for production-ready code patterns.