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+# CLAUDE.md
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+
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+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
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+
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+## Project Overview
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+
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+Firefox browser extension that manages video playlists and tracks playback history. All data is persisted via the browser's `storage` API — no backend, no IndexedDB. Uses Manifest V2 and vanilla JavaScript with no build step; load via `about:debugging` → "Load Temporary Add-on" → select `manifest.json`.
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+
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+## Code Layout
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+
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+- `popup/` — Extension popup UI (Alpine.js, single-page, multiple views)
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+- `background.js` — Service worker: context menus, storage init, autoplay chaining, history tracking
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+- `content_scripts/content.js` — Injected into YouTube pages; forwards `play`/`pause`/`ended` events to background
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+- `shared/playlist-utils.js` — Shared helpers used by both popup and background (video ID extraction, deduplication, search)
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+
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+## Alpine.js CSP Compliance (Critical)
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+
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+The popup runs under a Content Security Policy that forbids inline JavaScript evaluation. All Alpine.js code must be CSP-compliant:
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+
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+- **No JavaScript expressions in HTML attributes** — `x-show="count === 0"`, `x-text="label()"`, ternaries, method calls are all forbidden
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+- Use `Alpine.data()` binding objects and pre-compute all display values as properties
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+- Bind with `x-bind` or `:attr`; never inline logic in templates
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+
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+Violation examples to avoid: `x-show="items.length > 0"`, `x-text="getName(id)"`, `x-if="a === b"`.
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+
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+## Popup Views
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+
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+The popup is a single-page app; `currentView` controls which view is active:
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+
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+| View | Purpose |
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+|------|---------|
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+| `playlists` | Main view: all playlists and their unviewed videos |
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+| `playlist` | Single-playlist detail with full video list including viewed |
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+| `history` | Playback history with per-event tags |
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+| `saveChannel` | Save a YouTube channel with categories |
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+| `wikiInsp` | Copy video info as wikitext |
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+| `import` | Import playlists from JSON |
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+
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+## Key Constraints
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+
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+- A video can exist in **at most one playlist** — `addVideoToPlaylist()` enforces global deduplication
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+- The 6 default playlists (`listening-long`, `listening-short`, `listening-misc`, `watching-short`, `watching-long`, `slow-tv`) are hardcoded in both `background.js` and the context menu; adding a new playlist requires changes in both places
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+- History is keyed by YouTube video ID; rewatching appends new interaction events rather than overwriting
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Brandon Wong