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export default {
  relations: (relation, track) => ({
    albumLink:
      relation('linkAlbum', track.album),
    trackLink:
      relation('linkTrack', track),
  }),
  data: (track) => ({
    albumStyle:
      track.album.style,
    hasTrackNumbers:
      track.album.hasTrackNumbers,
    trackNumber:
      track.trackNumber,
  }),
  slots: {
    currentExtra: {
      validate: v => v.is('referenced-art', 'referencing-art'),
    },
  },
  generate: (data, relations, slots, {html, language}) =>
    language.encapsulate('trackPage.nav', navCapsule => [
      {auto: 'home'},
      {
        html: relations.albumLink.slot('color', false),
        accent:
          (data.albumStyle === 'single'
            ? language.$(navCapsule, 'singleAccent')
            : null),
      },
      {
        html:
          language.encapsulate(navCapsule, 'track', workingCapsule => {
            const workingOptions = {};
            workingOptions.track =
              relations.trackLink
                .slot('attributes', {class: 'current'});
            if (data.hasTrackNumbers) {
              workingCapsule += '.withNumber';
              workingOptions.number = data.trackNumber;
            }
            return language.$(workingCapsule, workingOptions);
          }),
        accent:
          html.tag('a',
            {[html.onlyIfContent]: true},
            {href: ''},
            {class: 'current'},
            (slots.currentExtra === 'referenced-art'
              ? language.$('referencedArtworksPage.subtitle')
           : slots.currentExtra === 'referencing-art'
              ? language.$('referencingArtworksPage.subtitle')
              : null)),
      },
    ]),
};
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