Build track and playlist Runes
Summary
track is a single media item (song, podcast episode, audiobook chapter, talk, or video). playlist is an ordered collection of tracks (album tracklist, podcast feed, video series, audiobook TOC). These replace the existing music-recording and music-playlist runes with a type-polymorphic design.
These two runes are tightly coupled — playlist defines a compact Markdown-native format that parses into tracks — so they're built together.
Migration from Existing Runes
| Existing | New | Attribute changes |
|---|---|---|
music-recording | track with type="song" | byArtist → artist, copyrightYear → year |
music-playlist | playlist with type="album" | Remove trackFields, split, mirror. Add artist. |
Existing runes continue as aliases during transition.
Track Attributes
| Name | Type | Default | Required | Description |
|---|---|---|---|---|
type | String | 'song' | No | song, episode, chapter, talk, video |
artist | String | — | No | Creator/performer name |
album | String | — | No | Parent collection |
duration | String | — | No | ISO 8601 duration (formatted to 3:45 display) |
year | Number | — | No | Release year |
number | Number | — | No | Track/episode/chapter number |
url | String | — | No | Link to the media |
date | String | — | No | Publication date (ISO 8601, for episodes/series) |
listItem | Boolean | false | No | Render as <li> instead of <div> |
Playlist Attributes
| Name | Type | Default | Required | Description |
|---|---|---|---|---|
type | String | 'album' | No | album, podcast, audiobook, series, mix |
artist | String | — | No | Default artist inherited by all child tracks |
audio | String | — | No | Audio file URL for embedded playback |
Compact Track Format (Markdown-native)
Per Media Runes — Specification, track metadata uses Markdown formatting constructs instead of pipe-delimited strings:
| Markdown construct | Track field | Example |
|---|---|---|
| Bold text | Track name | **Bohemian Rhapsody** |
| Link wrapping the name | Audio source (src) | [**Breathe**](/audio/breathe.mp3) |
| Italic text | Artist | *Queen* |
(duration) | Duration | (5:55) |
| Text after em-dash | Date or context | — 2024-01-15 |
When artist is set on the playlist, parsed list-item tracks inherit it as their default artist.
Transform Output
Track:
- typeof:
Track - Tag:
<div>or<li> - Properties:
name(h-element),artist(span),album(span),duration(span, formatted),year(span),number(span),url(a),date(span),type
Playlist:
- typeof:
Playlist - Tag:
<section> - Properties:
eyebrow,headline,image,blurb,type,artist(span) - Refs:
tracks(ol of track items)
Status
Already implemented. Both runes have full schemas, configs, CSS, tests, and legacy aliases:
- Track schema:
runes/media/src/tags/track.ts(129 lines) - Playlist schema:
runes/media/src/tags/playlist.ts(323 lines) - Config:
runes/media/src/config.ts(Track,Playlist,MusicRecording,MusicPlaylist) - CSS:
packages/lumina/styles/runes/track.css+playlist.css - Tests:
runes/media/test/track.test.ts,playlist.test.ts,music-playlist.test.ts - Legacy aliases:
music-recording→Track,music-playlist→Playlist(with deprecation notices) - Duration utilities:
runes/media/src/duration.ts - SEO tests:
runes/media/test/seo.test.ts