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hsmusic-wiki - HSMusic - static wiki software cataloguing collaborative creation
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-// things.js: class definitions for various object types used across the wiki,
-// most of which correspond to an output page, such as Track, Album, Artist
-
-import CacheableObject from './cacheable-object.js';
-
-import {
-  isAdditionalFileList,
-  isBoolean,
-  isColor,
-  isCommentary,
-  isCountingNumber,
-  isContributionList,
-  isDate,
-  isDimensions,
-  isDirectory,
-  isDuration,
-  isFileExtension,
-  isLanguageCode,
-  isName,
-  isNumber,
-  isURL,
-  isString,
-  oneOf,
-  validateArrayItems,
-  validateInstanceOf,
-  validateReference,
-  validateReferenceList,
-} from './validators.js';
-
-import * as S from './serialize.js';
-
-import {
-  getKebabCase,
-  sortAlbumsTracksChronologically,
-} from '../util/wiki-data.js';
-
-import find from '../util/find.js';
-
-import {inspect} from 'util';
-import {color} from '../util/cli.js';
-
-// Stub classes (and their exports) at the top of the file - these are
-// referenced later when we actually define static class fields. We deliberately
-// define the classes and set their static fields in two separate steps so that
-// every class coexists from the outset, and can be directly referenced in field
-// definitions later.
-
-// This list also acts as a quick table of contents for this JS file - use
-// ctrl+F or similar to skip to a section.
-
-// -> Thing
-export class Thing extends CacheableObject {}
-
-// -> Album
-export class Album extends Thing {}
-export class TrackGroup extends CacheableObject {}
-
-// -> Track
-export class Track extends Thing {}
-
-// -> Artist
-export class Artist extends Thing {}
-
-// -> Group
-export class Group extends Thing {}
-export class GroupCategory extends CacheableObject {}
-
-// -> ArtTag
-export class ArtTag extends Thing {}
-
-// -> NewsEntry
-export class NewsEntry extends Thing {}
-
-// -> StaticPage
-export class StaticPage extends Thing {}
-
-// -> HomepageLayout
-export class HomepageLayout extends CacheableObject {}
-export class HomepageLayoutRow extends CacheableObject {}
-export class HomepageLayoutAlbumsRow extends HomepageLayoutRow {}
-
-// -> Flash
-export class Flash extends Thing {}
-export class FlashAct extends CacheableObject {}
-
-// -> WikiInfo
-export class WikiInfo extends CacheableObject {}
-
-// -> Language
-export class Language extends CacheableObject {}
-
-// Before initializing property descriptors, set additional independent
-// constants on the classes (which are referenced later).
-
-Thing.referenceType = Symbol('Thing.referenceType');
-
-Album[Thing.referenceType] = 'album';
-Track[Thing.referenceType] = 'track';
-Artist[Thing.referenceType] = 'artist';
-Group[Thing.referenceType] = 'group';
-ArtTag[Thing.referenceType] = 'tag';
-NewsEntry[Thing.referenceType] = 'news-entry';
-StaticPage[Thing.referenceType] = 'static';
-Flash[Thing.referenceType] = 'flash';
-
-// -> Thing: base class for wiki data types, providing wiki-specific utility
-// functions on top of essential CacheableObject behavior.
-
-// Regularly reused property descriptors, for ease of access and generally
-// duplicating less code across wiki data types. These are specialized utility
-// functions, so check each for how its own arguments behave!
-Thing.common = {
-  name: (defaultName) => ({
-    flags: {update: true, expose: true},
-    update: {validate: isName, default: defaultName},
-  }),
-
-  color: () => ({
-    flags: {update: true, expose: true},
-    update: {validate: isColor},
-  }),
-
-  directory: () => ({
-    flags: {update: true, expose: true},
-    update: {validate: isDirectory},
-    expose: {
-      dependencies: ['name'],
-      transform(directory, {name}) {
-        if (directory === null && name === null) return null;
-        else if (directory === null) return getKebabCase(name);
-        else return directory;
-      },
-    },
-  }),
-
-  urls: () => ({
-    flags: {update: true, expose: true},
-    update: {validate: validateArrayItems(isURL)},
-  }),
-
-  // A file extension! Or the default, if provided when calling this.
-  fileExtension: (defaultFileExtension = null) => ({
-    flags: {update: true, expose: true},
-    update: {validate: isFileExtension},
-    expose: {transform: (value) => value ?? defaultFileExtension},
-  }),
-
-  // Straightforward flag descriptor for a variety of property purposes.
-  // Provide a default value, true or false!
-  flag: (defaultValue = false) => {
-    if (typeof defaultValue !== 'boolean') {
-      throw new TypeError(`Always set explicit defaults for flags!`);
-    }
-
-    return {
-      flags: {update: true, expose: true},
-      update: {validate: isBoolean, default: defaultValue},
-    };
-  },
-
-  // General date type, used as the descriptor for a bunch of properties.
-  // This isn't dynamic though - it won't inherit from a date stored on
-  // another object, for example.
-  simpleDate: () => ({
-    flags: {update: true, expose: true},
-    update: {validate: isDate},
-  }),
-
-  // General string type. This should probably generally be avoided in favor
-  // of more specific validation, but using it makes it easy to find where we
-  // might want to improve later, and it's a useful shorthand meanwhile.
-  simpleString: () => ({
-    flags: {update: true, expose: true},
-    update: {validate: isString},
-  }),
-
-  // External function. These should only be used as dependencies for other
-  // properties, so they're left unexposed.
-  externalFunction: () => ({
-    flags: {update: true},
-    update: {validate: (t) => typeof t === 'function'},
-  }),
-
-  // Super simple "contributions by reference" list, used for a variety of
-  // properties (Artists, Cover Artists, etc). This is the property which is
-  // externally provided, in the form:
-  //
-  //     [
-  //         {who: 'Artist Name', what: 'Viola'},
-  //         {who: 'artist:john-cena', what: null},
-  //         ...
-  //     ]
-  //
-  // ...processed from YAML, spreadsheet, or any other kind of input.
-  contribsByRef: () => ({
-    flags: {update: true, expose: true},
-    update: {validate: isContributionList},
-  }),
-
-  // Artist commentary! Generally present on tracks and albums.
-  commentary: () => ({
-    flags: {update: true, expose: true},
-    update: {validate: isCommentary},
-  }),
-
-  // This is a somewhat more involved data structure - it's for additional
-  // or "bonus" files associated with albums or tracks (or anything else).
-  // It's got this form:
-  //
-  //     [
-  //         {title: 'Booklet', files: ['Booklet.pdf']},
-  //         {
-  //             title: 'Wallpaper',
-  //             description: 'Cool Wallpaper!',
-  //             files: ['1440x900.png', '1920x1080.png']
-  //         },
-  //         {title: 'Alternate Covers', description: null, files: [...]},
-  //         ...
-  //     ]
-  //
-  additionalFiles: () => ({
-    flags: {update: true, expose: true},
-    update: {validate: isAdditionalFileList},
-  }),
-
-  // A reference list! Keep in mind this is for general references to wiki
-  // objects of (usually) other Thing subclasses, not specifically leitmotif
-  // references in tracks (although that property uses referenceList too!).
-  //
-  // The underlying function validateReferenceList expects a string like
-  // 'artist' or 'track', but this utility keeps from having to hard-code the
-  // string in multiple places by referencing the value saved on the class
-  // instead.
-  referenceList: (thingClass) => {
-    const {[Thing.referenceType]: referenceType} = thingClass;
-    if (!referenceType) {
-      throw new Error(`The passed constructor ${thingClass.name} doesn't define Thing.referenceType!`);
-    }
-
-    return {
-      flags: {update: true, expose: true},
-      update: {validate: validateReferenceList(referenceType)},
-    };
-  },
-
-  // Corresponding function for a single reference.
-  singleReference: (thingClass) => {
-    const {[Thing.referenceType]: referenceType} = thingClass;
-    if (!referenceType) {
-      throw new Error(`The passed constructor ${thingClass.name} doesn't define Thing.referenceType!`);
-    }
-
-    return {
-      flags: {update: true, expose: true},
-      update: {validate: validateReference(referenceType)},
-    };
-  },
-
-  // Corresponding dynamic property to referenceList, which takes the values
-  // in the provided property and searches the specified wiki data for
-  // matching actual Thing-subclass objects.
-  dynamicThingsFromReferenceList: (
-    referenceListProperty,
-    thingDataProperty,
-    findFn
-  ) => ({
-    flags: {expose: true},
-
-    expose: {
-      dependencies: [referenceListProperty, thingDataProperty],
-      compute: ({
-        [referenceListProperty]: refs,
-        [thingDataProperty]: thingData,
-      }) =>
-        refs && thingData
-          ? refs
-              .map((ref) => findFn(ref, thingData, {mode: 'quiet'}))
-              .filter(Boolean)
-          : [],
-    },
-  }),
-
-  // Corresponding function for a single reference.
-  dynamicThingFromSingleReference: (
-    singleReferenceProperty,
-    thingDataProperty,
-    findFn
-  ) => ({
-    flags: {expose: true},
-
-    expose: {
-      dependencies: [singleReferenceProperty, thingDataProperty],
-      compute: ({
-        [singleReferenceProperty]: ref,
-        [thingDataProperty]: thingData,
-      }) => (ref && thingData ? findFn(ref, thingData, {mode: 'quiet'}) : null),
-    },
-  }),
-
-  // Corresponding dynamic property to contribsByRef, which takes the values
-  // in the provided property and searches the object's artistData for
-  // matching actual Artist objects. The computed structure has the same form
-  // as contribsByRef, but with Artist objects instead of string references:
-  //
-  //     [
-  //         {who: (an Artist), what: 'Viola'},
-  //         {who: (an Artist), what: null},
-  //         ...
-  //     ]
-  //
-  // Contributions whose "who" values don't match anything in artistData are
-  // filtered out. (So if the list is all empty, chances are that either the
-  // reference list is somehow messed up, or artistData isn't being provided
-  // properly.)
-  dynamicContribs: (contribsByRefProperty) => ({
-    flags: {expose: true},
-    expose: {
-      dependencies: ['artistData', contribsByRefProperty],
-      compute: ({artistData, [contribsByRefProperty]: contribsByRef}) =>
-        contribsByRef && artistData
-          ? contribsByRef
-              .map(({who: ref, what}) => ({
-                who: find.artist(ref, artistData),
-                what,
-              }))
-              .filter(({who}) => who)
-          : [],
-    },
-  }),
-
-  // Dynamically inherit a contribution list from some other object, if it
-  // hasn't been overridden on this object. This is handy for solo albums
-  // where all tracks have the same artist, for example.
-  //
-  // Note: The arguments of this function aren't currently final! The final
-  // format will look more like (contribsByRef, parentContribsByRef), e.g.
-  // ('artistContribsByRef', '@album/artistContribsByRef').
-  dynamicInheritContribs: (
-    contribsByRefProperty,
-    parentContribsByRefProperty,
-    thingDataProperty,
-    findFn
-  ) => ({
-    flags: {expose: true},
-    expose: {
-      dependencies: [contribsByRefProperty, thingDataProperty, 'artistData'],
-      compute({
-        [Thing.instance]: thing,
-        [contribsByRefProperty]: contribsByRef,
-        [thingDataProperty]: thingData,
-        artistData,
-      }) {
-        if (!artistData) return [];
-        const refs =
-          contribsByRef ??
-          findFn(thing, thingData, {mode: 'quiet'})?.[parentContribsByRefProperty];
-        if (!refs) return [];
-        return refs
-          .map(({who: ref, what}) => ({
-            who: find.artist(ref, artistData),
-            what,
-          }))
-          .filter(({who}) => who);
-      },
-    },
-  }),
-
-  // Neat little shortcut for "reversing" the reference lists stored on other
-  // things - for example, tracks specify a "referenced tracks" property, and
-  // you would use this to compute a corresponding "referenced *by* tracks"
-  // property. Naturally, the passed ref list property is of the things in the
-  // wiki data provided, not the requesting Thing itself.
-  reverseReferenceList: (thingDataProperty, referencerRefListProperty) => ({
-    flags: {expose: true},
-
-    expose: {
-      dependencies: [thingDataProperty],
-
-      compute: ({[thingDataProperty]: thingData, [Thing.instance]: thing}) =>
-        thingData?.filter(t => t[referencerRefListProperty].includes(thing)) ?? [],
-    },
-  }),
-
-  // Corresponding function for single references. Note that the return value
-  // is still a list - this is for matching all the objects whose single
-  // reference (in the given property) matches this Thing.
-  reverseSingleReference: (thingDataProperty, referencerRefListProperty) => ({
-    flags: {expose: true},
-
-    expose: {
-      dependencies: [thingDataProperty],
-
-      compute: ({[thingDataProperty]: thingData, [Thing.instance]: thing}) =>
-        thingData?.filter((t) => t[referencerRefListProperty] === thing) ?? [],
-    },
-  }),
-
-  // General purpose wiki data constructor, for properties like artistData,
-  // trackData, etc.
-  wikiData: (thingClass) => ({
-    flags: {update: true},
-    update: {
-      validate: validateArrayItems(validateInstanceOf(thingClass)),
-    },
-  }),
-
-  // This one's kinda tricky: it parses artist "references" from the
-  // commentary content, and finds the matching artist for each reference.
-  // This is mostly useful for credits and listings on artist pages.
-  commentatorArtists: () => ({
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['artistData', 'commentary'],
-
-      compute: ({artistData, commentary}) =>
-        artistData && commentary
-          ? Array.from(
-              new Set(
-                Array.from(
-                  commentary
-                    .replace(/<\/?b>/g, '')
-                    .matchAll(/<i>(?<who>.*?):<\/i>/g)
-                ).map(({groups: {who}}) =>
-                  find.artist(who, artistData, {mode: 'quiet'})
-                )
-              )
-            )
-          : [],
-    },
-  }),
-};
-
-// Get a reference to a thing (e.g. track:showtime-piano-refrain), using its
-// constructor's [Thing.referenceType] as the prefix. This will throw an error
-// if the thing's directory isn't yet provided/computable.
-Thing.getReference = function (thing) {
-  if (!thing.constructor[Thing.referenceType]) {
-    throw TypeError(`Passed Thing is ${thing.constructor.name}, which provides no [Thing.referenceType]`);
-  }
-
-  if (!thing.directory) {
-    throw TypeError(`Passed ${thing.constructor.name} is missing its directory`);
-  }
-
-  return `${thing.constructor[Thing.referenceType]}:${thing.directory}`;
-};
-
-// Default custom inspect function, which may be overridden by Thing subclasses.
-// This will be used when displaying aggregate errors and other in command-line
-// logging - it's the place to provide information useful in identifying the
-// Thing being presented.
-Thing.prototype[inspect.custom] = function () {
-  const cname = this.constructor.name;
-
-  return (
-    (this.name ? `${cname} ${color.green(`"${this.name}"`)}` : `${cname}`) +
-    (this.directory ? ` (${color.blue(Thing.getReference(this))})` : '')
-  );
-};
-
-// -> Album
-
-Album.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Album'),
-  color: Thing.common.color(),
-  directory: Thing.common.directory(),
-  urls: Thing.common.urls(),
-
-  date: Thing.common.simpleDate(),
-  trackArtDate: Thing.common.simpleDate(),
-  dateAddedToWiki: Thing.common.simpleDate(),
-
-  coverArtDate: {
-    flags: {update: true, expose: true},
-
-    update: {validate: isDate},
-
-    expose: {
-      dependencies: ['date'],
-      transform: (coverArtDate, {date}) => coverArtDate ?? date ?? null,
-    },
-  },
-
-  artistContribsByRef: Thing.common.contribsByRef(),
-  coverArtistContribsByRef: Thing.common.contribsByRef(),
-  trackCoverArtistContribsByRef: Thing.common.contribsByRef(),
-  wallpaperArtistContribsByRef: Thing.common.contribsByRef(),
-  bannerArtistContribsByRef: Thing.common.contribsByRef(),
-
-  groupsByRef: Thing.common.referenceList(Group),
-  artTagsByRef: Thing.common.referenceList(ArtTag),
-
-  trackGroups: {
-    flags: {update: true, expose: true},
-
-    update: {
-      validate: validateArrayItems(validateInstanceOf(TrackGroup)),
-    },
-  },
-
-  coverArtFileExtension: Thing.common.fileExtension('jpg'),
-  trackCoverArtFileExtension: Thing.common.fileExtension('jpg'),
-
-  wallpaperStyle: Thing.common.simpleString(),
-  wallpaperFileExtension: Thing.common.fileExtension('jpg'),
-
-  bannerStyle: Thing.common.simpleString(),
-  bannerFileExtension: Thing.common.fileExtension('jpg'),
-  bannerDimensions: {
-    flags: {update: true, expose: true},
-    update: {validate: isDimensions},
-  },
-
-  hasCoverArt: Thing.common.flag(true),
-  hasTrackArt: Thing.common.flag(true),
-  hasTrackNumbers: Thing.common.flag(true),
-  isMajorRelease: Thing.common.flag(false),
-  isListedOnHomepage: Thing.common.flag(true),
-
-  commentary: Thing.common.commentary(),
-  additionalFiles: Thing.common.additionalFiles(),
-
-  // Update only
-
-  artistData: Thing.common.wikiData(Artist),
-  artTagData: Thing.common.wikiData(ArtTag),
-  groupData: Thing.common.wikiData(Group),
-  trackData: Thing.common.wikiData(Track),
-
-  // Expose only
-
-  artistContribs: Thing.common.dynamicContribs('artistContribsByRef'),
-  coverArtistContribs: Thing.common.dynamicContribs('coverArtistContribsByRef'),
-  trackCoverArtistContribs: Thing.common.dynamicContribs(
-    'trackCoverArtistContribsByRef'
-  ),
-  wallpaperArtistContribs: Thing.common.dynamicContribs(
-    'wallpaperArtistContribsByRef'
-  ),
-  bannerArtistContribs: Thing.common.dynamicContribs(
-    'bannerArtistContribsByRef'
-  ),
-
-  commentatorArtists: Thing.common.commentatorArtists(),
-
-  tracks: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['trackGroups', 'trackData'],
-      compute: ({trackGroups, trackData}) =>
-        trackGroups && trackData
-          ? trackGroups
-              .flatMap((group) => group.tracksByRef ?? [])
-              .map((ref) => find.track(ref, trackData, {mode: 'quiet'}))
-              .filter(Boolean)
-          : [],
-    },
-  },
-
-  groups: Thing.common.dynamicThingsFromReferenceList(
-    'groupsByRef',
-    'groupData',
-    find.group
-  ),
-
-  artTags: Thing.common.dynamicThingsFromReferenceList(
-    'artTagsByRef',
-    'artTagData',
-    find.artTag
-  ),
-};
-
-Album[S.serializeDescriptors] = {
-  name: S.id,
-  color: S.id,
-  directory: S.id,
-  urls: S.id,
-
-  date: S.id,
-  coverArtDate: S.id,
-  trackArtDate: S.id,
-  dateAddedToWiki: S.id,
-
-  artistContribs: S.toContribRefs,
-  coverArtistContribs: S.toContribRefs,
-  trackCoverArtistContribs: S.toContribRefs,
-  wallpaperArtistContribs: S.toContribRefs,
-  bannerArtistContribs: S.toContribRefs,
-
-  coverArtFileExtension: S.id,
-  trackCoverArtFileExtension: S.id,
-  wallpaperStyle: S.id,
-  wallpaperFileExtension: S.id,
-  bannerStyle: S.id,
-  bannerFileExtension: S.id,
-  bannerDimensions: S.id,
-
-  hasTrackArt: S.id,
-  isMajorRelease: S.id,
-  isListedOnHomepage: S.id,
-
-  commentary: S.id,
-  additionalFiles: S.id,
-
-  tracks: S.toRefs,
-  groups: S.toRefs,
-  artTags: S.toRefs,
-  commentatorArtists: S.toRefs,
-};
-
-TrackGroup.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Track Group'),
-
-  color: {
-    flags: {update: true, expose: true},
-
-    update: {validate: isColor},
-
-    expose: {
-      dependencies: ['album'],
-
-      transform(color, {album}) {
-        return color ?? album?.color ?? null;
-      },
-    },
-  },
-
-  dateOriginallyReleased: Thing.common.simpleDate(),
-
-  tracksByRef: Thing.common.referenceList(Track),
-
-  isDefaultTrackGroup: Thing.common.flag(false),
-
-  // Update only
-
-  album: {
-    flags: {update: true},
-    update: {validate: validateInstanceOf(Album)},
-  },
-
-  trackData: Thing.common.wikiData(Track),
-
-  // Expose only
-
-  tracks: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['tracksByRef', 'trackData'],
-      compute: ({tracksByRef, trackData}) =>
-        tracksByRef && trackData
-          ? tracksByRef.map((ref) => find.track(ref, trackData)).filter(Boolean)
-          : [],
-    },
-  },
-
-  startIndex: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['album'],
-      compute: ({album, [TrackGroup.instance]: trackGroup}) =>
-        album.trackGroups
-          .slice(0, album.trackGroups.indexOf(trackGroup))
-          .reduce((acc, tg) => acc + tg.tracks.length, 0),
-    },
-  },
-};
-
-// -> Track
-
-// This is a quick utility function for now, since the same code is reused in
-// several places. Ideally it wouldn't be - we'd just reuse the `album` property
-// - but support for that hasn't been coded yet :P
-Track.findAlbum = (track, albumData) => {
-  return albumData?.find((album) => album.tracks.includes(track));
-};
-
-// Another reused utility function. This one's logic is a bit more complicated.
-Track.hasCoverArt = (
-  track,
-  albumData,
-  coverArtistContribsByRef,
-  hasCoverArt
-) => {
-  return (
-    hasCoverArt ??
-    (coverArtistContribsByRef?.length > 0 || null) ??
-    Track.findAlbum(track, albumData)?.hasTrackArt ??
-    true
-  );
-};
-
-Track.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Track'),
-  directory: Thing.common.directory(),
-
-  duration: {
-    flags: {update: true, expose: true},
-    update: {validate: isDuration},
-  },
-
-  urls: Thing.common.urls(),
-  dateFirstReleased: Thing.common.simpleDate(),
-
-  hasURLs: Thing.common.flag(true),
-
-  artistContribsByRef: Thing.common.contribsByRef(),
-  contributorContribsByRef: Thing.common.contribsByRef(),
-  coverArtistContribsByRef: Thing.common.contribsByRef(),
-
-  referencedTracksByRef: Thing.common.referenceList(Track),
-  sampledTracksByRef: Thing.common.referenceList(Track),
-  artTagsByRef: Thing.common.referenceList(ArtTag),
-
-  hasCoverArt: {
-    flags: {update: true, expose: true},
-
-    update: {validate: isBoolean},
-
-    expose: {
-      dependencies: ['albumData', 'coverArtistContribsByRef'],
-      transform: (hasCoverArt, {
-        albumData,
-        coverArtistContribsByRef,
-        [Track.instance]: track,
-      }) =>
-        Track.hasCoverArt(
-          track,
-          albumData,
-          coverArtistContribsByRef,
-          hasCoverArt
-        ),
-    },
-  },
-
-  coverArtFileExtension: {
-    flags: {update: true, expose: true},
-
-    update: {validate: isFileExtension},
-
-    expose: {
-      dependencies: ['albumData', 'coverArtistContribsByRef'],
-      transform: (coverArtFileExtension, {
-        albumData,
-        coverArtistContribsByRef,
-        hasCoverArt,
-        [Track.instance]: track,
-      }) =>
-        coverArtFileExtension ??
-        (Track.hasCoverArt(
-          track,
-          albumData,
-          coverArtistContribsByRef,
-          hasCoverArt
-        )
-          ? Track.findAlbum(track, albumData)?.trackCoverArtFileExtension
-          : Track.findAlbum(track, albumData)?.coverArtFileExtension) ??
-        'jpg',
-    },
-  },
-
-  // Previously known as: (track).aka
-  originalReleaseTrackByRef: Thing.common.singleReference(Track),
-
-  dataSourceAlbumByRef: Thing.common.singleReference(Album),
-
-  commentary: Thing.common.commentary(),
-  lyrics: Thing.common.simpleString(),
-  additionalFiles: Thing.common.additionalFiles(),
-
-  // Update only
-
-  albumData: Thing.common.wikiData(Album),
-  artistData: Thing.common.wikiData(Artist),
-  artTagData: Thing.common.wikiData(ArtTag),
-  flashData: Thing.common.wikiData(Flash),
-  trackData: Thing.common.wikiData(Track),
-
-  // Expose only
-
-  commentatorArtists: Thing.common.commentatorArtists(),
-
-  album: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['albumData'],
-      compute: ({[Track.instance]: track, albumData}) =>
-        albumData?.find((album) => album.tracks.includes(track)) ?? null,
-    },
-  },
-
-  // Note - this is an internal property used only to help identify a track.
-  // It should not be assumed in general that the album and dataSourceAlbum match
-  // (i.e. a track may dynamically be moved from one album to another, at
-  // which point dataSourceAlbum refers to where it was originally from, and is
-  // not generally relevant information). It's also not guaranteed that
-  // dataSourceAlbum is available (depending on the Track creator to optionally
-  // provide dataSourceAlbumByRef).
-  dataSourceAlbum: Thing.common.dynamicThingFromSingleReference(
-    'dataSourceAlbumByRef',
-    'albumData',
-    find.album
-  ),
-
-  date: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['albumData', 'dateFirstReleased'],
-      compute: ({albumData, dateFirstReleased, [Track.instance]: track}) =>
-        dateFirstReleased ?? Track.findAlbum(track, albumData)?.date ?? null,
-    },
-  },
-
-  color: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['albumData'],
-
-      compute: ({albumData, [Track.instance]: track}) =>
-        Track.findAlbum(track, albumData)?.trackGroups.find((tg) =>
-          tg.tracks.includes(track)
-        )?.color ?? null,
-    },
-  },
-
-  coverArtDate: {
-    flags: {update: true, expose: true},
-
-    update: {validate: isDate},
-
-    expose: {
-      dependencies: ['albumData', 'dateFirstReleased'],
-      transform: (coverArtDate, {
-        albumData,
-        dateFirstReleased,
-        [Track.instance]: track,
-      }) =>
-        coverArtDate ??
-        dateFirstReleased ??
-        Track.findAlbum(track, albumData)?.trackArtDate ??
-        Track.findAlbum(track, albumData)?.date ??
-        null,
-    },
-  },
-
-  originalReleaseTrack: Thing.common.dynamicThingFromSingleReference(
-    'originalReleaseTrackByRef',
-    'trackData',
-    find.track
-  ),
-
-  otherReleases: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['originalReleaseTrackByRef', 'trackData'],
-
-      compute: ({
-        originalReleaseTrackByRef: t1origRef,
-        trackData,
-        [Track.instance]: t1,
-      }) => {
-        if (!trackData) {
-          return [];
-        }
-
-        const t1orig = find.track(t1origRef, trackData);
-
-        return [
-          t1orig,
-          ...trackData.filter((t2) => {
-            const {originalReleaseTrack: t2orig} = t2;
-            return t2 !== t1 && t2orig && (t2orig === t1orig || t2orig === t1);
-          }),
-        ].filter(Boolean);
-      },
-    },
-  },
-
-  // Previously known as: (track).artists
-  artistContribs: Thing.common.dynamicInheritContribs(
-    'artistContribsByRef',
-    'artistContribsByRef',
-    'albumData',
-    Track.findAlbum
-  ),
-
-  // Previously known as: (track).contributors
-  contributorContribs: Thing.common.dynamicContribs('contributorContribsByRef'),
-
-  // Previously known as: (track).coverArtists
-  coverArtistContribs: Thing.common.dynamicInheritContribs(
-    'coverArtistContribsByRef',
-    'trackCoverArtistContribsByRef',
-    'albumData',
-    Track.findAlbum
-  ),
-
-  // Previously known as: (track).references
-  referencedTracks: Thing.common.dynamicThingsFromReferenceList(
-    'referencedTracksByRef',
-    'trackData',
-    find.track
-  ),
-
-  sampledTracks: Thing.common.dynamicThingsFromReferenceList(
-    'sampledTracksByRef',
-    'trackData',
-    find.track
-  ),
-
-  // Specifically exclude re-releases from this list - while it's useful to
-  // get from a re-release to the tracks it references, re-releases aren't
-  // generally relevant from the perspective of the tracks being referenced.
-  // Filtering them from data here hides them from the corresponding field
-  // on the site (obviously), and has the bonus of not counting them when
-  // counting the number of times a track has been referenced, for use in
-  // the "Tracks - by Times Referenced" listing page (or other data
-  // processing).
-  referencedByTracks: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['trackData'],
-
-      compute: ({trackData, [Track.instance]: track}) =>
-        trackData
-          ? trackData
-              .filter((t) => !t.originalReleaseTrack)
-              .filter((t) => t.referencedTracks?.includes(track))
-          : [],
-    },
-  },
-
-  // For the same reasoning, exclude re-releases from sampled tracks too.
-  sampledByTracks: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['trackData'],
-
-      compute: ({trackData, [Track.instance]: track}) =>
-        trackData
-          ? trackData
-              .filter((t) => !t.originalReleaseTrack)
-              .filter((t) => t.sampledTracks?.includes(track))
-          : [],
-    },
-  },
-
-  // Previously known as: (track).flashes
-  featuredInFlashes: Thing.common.reverseReferenceList(
-    'flashData',
-    'featuredTracks'
-  ),
-
-  artTags: Thing.common.dynamicThingsFromReferenceList(
-    'artTagsByRef',
-    'artTagData',
-    find.artTag
-  ),
-};
-
-Track.prototype[inspect.custom] = function () {
-  const base = Thing.prototype[inspect.custom].apply(this);
-
-  const {album, dataSourceAlbum} = this;
-  const albumName = album ? album.name : dataSourceAlbum?.name;
-  const albumIndex =
-    albumName &&
-    (album ? album.tracks.indexOf(this) : dataSourceAlbum.tracks.indexOf(this));
-  const trackNum = albumIndex === -1 ? '#?' : `#${albumIndex + 1}`;
-
-  return albumName
-    ? base + ` (${color.yellow(trackNum)} in ${color.green(albumName)})`
-    : base;
-};
-
-// -> Artist
-
-Artist.filterByContrib = (thingDataProperty, contribsProperty) => ({
-  flags: {expose: true},
-
-  expose: {
-    dependencies: [thingDataProperty],
-
-    compute: ({
-      [thingDataProperty]: thingData,
-      [Artist.instance]: artist
-    }) =>
-      thingData?.filter(thing =>
-        thing[contribsProperty]
-          .some(contrib => contrib.who === artist)) ?? [],
-  },
-});
-
-Artist.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Artist'),
-  directory: Thing.common.directory(),
-  urls: Thing.common.urls(),
-  contextNotes: Thing.common.simpleString(),
-
-  hasAvatar: Thing.common.flag(false),
-  avatarFileExtension: Thing.common.fileExtension('jpg'),
-
-  aliasNames: {
-    flags: {update: true, expose: true},
-    update: {
-      validate: validateArrayItems(isName),
-    },
-  },
-
-  isAlias: Thing.common.flag(),
-  aliasedArtistRef: Thing.common.singleReference(Artist),
-
-  // Update only
-
-  albumData: Thing.common.wikiData(Album),
-  artistData: Thing.common.wikiData(Artist),
-  flashData: Thing.common.wikiData(Flash),
-  trackData: Thing.common.wikiData(Track),
-
-  // Expose only
-
-  aliasedArtist: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['artistData', 'aliasedArtistRef'],
-      compute: ({artistData, aliasedArtistRef}) =>
-        aliasedArtistRef && artistData
-          ? find.artist(aliasedArtistRef, artistData, {mode: 'quiet'})
-          : null,
-    },
-  },
-
-  tracksAsArtist:
-    Artist.filterByContrib('trackData', 'artistContribs'),
-  tracksAsContributor:
-    Artist.filterByContrib('trackData', 'contributorContribs'),
-  tracksAsCoverArtist:
-    Artist.filterByContrib('trackData', 'coverArtistContribs'),
-
-  tracksAsAny: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['trackData'],
-
-      compute: ({trackData, [Artist.instance]: artist}) =>
-        trackData?.filter((track) =>
-          [
-            ...track.artistContribs,
-            ...track.contributorContribs,
-            ...track.coverArtistContribs,
-          ].some(({who}) => who === artist)) ?? [],
-    },
-  },
-
-  tracksAsCommentator: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['trackData'],
-
-      compute: ({trackData, [Artist.instance]: artist}) =>
-        trackData?.filter(({commentatorArtists}) =>
-          commentatorArtists.includes(artist)) ?? [],
-    },
-  },
-
-  albumsAsAlbumArtist:
-    Artist.filterByContrib('albumData', 'artistContribs'),
-  albumsAsCoverArtist:
-    Artist.filterByContrib('albumData', 'coverArtistContribs'),
-  albumsAsWallpaperArtist:
-    Artist.filterByContrib('albumData', 'wallpaperArtistContribs'),
-  albumsAsBannerArtist:
-    Artist.filterByContrib('albumData', 'bannerArtistContribs'),
-
-  albumsAsCommentator: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['albumData'],
-
-      compute: ({albumData, [Artist.instance]: artist}) =>
-        albumData?.filter(({commentatorArtists}) =>
-          commentatorArtists.includes(artist)) ?? [],
-    },
-  },
-
-  flashesAsContributor: Artist.filterByContrib(
-    'flashData',
-    'contributorContribs'
-  ),
-};
-
-Artist[S.serializeDescriptors] = {
-  name: S.id,
-  directory: S.id,
-  urls: S.id,
-  contextNotes: S.id,
-
-  hasAvatar: S.id,
-  avatarFileExtension: S.id,
-
-  aliasNames: S.id,
-
-  tracksAsArtist: S.toRefs,
-  tracksAsContributor: S.toRefs,
-  tracksAsCoverArtist: S.toRefs,
-  tracksAsCommentator: S.toRefs,
-
-  albumsAsAlbumArtist: S.toRefs,
-  albumsAsCoverArtist: S.toRefs,
-  albumsAsWallpaperArtist: S.toRefs,
-  albumsAsBannerArtist: S.toRefs,
-  albumsAsCommentator: S.toRefs,
-
-  flashesAsContributor: S.toRefs,
-};
-
-// -> Group
-
-Group.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Group'),
-  directory: Thing.common.directory(),
-
-  description: Thing.common.simpleString(),
-
-  urls: Thing.common.urls(),
-
-  // Update only
-
-  albumData: Thing.common.wikiData(Album),
-  groupCategoryData: Thing.common.wikiData(GroupCategory),
-
-  // Expose only
-
-  descriptionShort: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['description'],
-      compute: ({description}) => description.split('<hr class="split">')[0],
-    },
-  },
-
-  albums: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['albumData'],
-      compute: ({albumData, [Group.instance]: group}) =>
-        albumData?.filter((album) => album.groups.includes(group)) ?? [],
-    },
-  },
-
-  color: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['groupCategoryData'],
-
-      compute: ({groupCategoryData, [Group.instance]: group}) =>
-        groupCategoryData.find((category) => category.groups.includes(group))
-          ?.color,
-    },
-  },
-
-  category: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['groupCategoryData'],
-      compute: ({groupCategoryData, [Group.instance]: group}) =>
-        groupCategoryData.find((category) => category.groups.includes(group)) ??
-        null,
-    },
-  },
-};
-
-GroupCategory.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Group Category'),
-  color: Thing.common.color(),
-
-  groupsByRef: Thing.common.referenceList(Group),
-
-  // Update only
-
-  groupData: Thing.common.wikiData(Group),
-
-  // Expose only
-
-  groups: Thing.common.dynamicThingsFromReferenceList(
-    'groupsByRef',
-    'groupData',
-    find.group
-  ),
-};
-
-// -> ArtTag
-
-ArtTag.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Art Tag'),
-  directory: Thing.common.directory(),
-  color: Thing.common.color(),
-  isContentWarning: Thing.common.flag(false),
-
-  // Update only
-
-  albumData: Thing.common.wikiData(Album),
-  trackData: Thing.common.wikiData(Track),
-
-  // Expose only
-
-  // Previously known as: (tag).things
-  taggedInThings: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['albumData', 'trackData'],
-      compute: ({albumData, trackData, [ArtTag.instance]: artTag}) =>
-        sortAlbumsTracksChronologically(
-          [...albumData, ...trackData]
-            .filter(({artTags}) => artTags.includes(artTag)),
-          {getDate: o => o.coverArtDate}),
-    },
-  },
-};
-
-// -> NewsEntry
-
-NewsEntry.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed News Entry'),
-  directory: Thing.common.directory(),
-  date: Thing.common.simpleDate(),
-
-  content: Thing.common.simpleString(),
-
-  // Expose only
-
-  contentShort: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['content'],
-
-      compute: ({content}) => content.split('<hr class="split">')[0],
-    },
-  },
-};
-
-// -> StaticPage
-
-StaticPage.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Static Page'),
-
-  nameShort: {
-    flags: {update: true, expose: true},
-    update: {validate: isName},
-
-    expose: {
-      dependencies: ['name'],
-      transform: (value, {name}) => value ?? name,
-    },
-  },
-
-  directory: Thing.common.directory(),
-  content: Thing.common.simpleString(),
-  stylesheet: Thing.common.simpleString(),
-  showInNavigationBar: Thing.common.flag(true),
-};
-
-// -> HomepageLayout
-
-HomepageLayout.propertyDescriptors = {
-  // Update & expose
-
-  sidebarContent: Thing.common.simpleString(),
-
-  rows: {
-    flags: {update: true, expose: true},
-
-    update: {
-      validate: validateArrayItems(validateInstanceOf(HomepageLayoutRow)),
-    },
-  },
-};
-
-HomepageLayoutRow.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Homepage Row'),
-
-  type: {
-    flags: {update: true, expose: true},
-
-    update: {
-      validate() {
-        throw new Error(`'type' property validator must be overridden`);
-      },
-    },
-  },
-
-  color: Thing.common.color(),
-
-  // Update only
-
-  // These aren't necessarily used by every HomepageLayoutRow subclass, but
-  // for convenience of providing this data, every row accepts all wiki data
-  // arrays depended upon by any subclass's behavior.
-  albumData: Thing.common.wikiData(Album),
-  groupData: Thing.common.wikiData(Group),
-};
-
-HomepageLayoutAlbumsRow.propertyDescriptors = {
-  ...HomepageLayoutRow.propertyDescriptors,
-
-  // Update & expose
-
-  type: {
-    flags: {update: true, expose: true},
-    update: {
-      validate(value) {
-        if (value !== 'albums') {
-          throw new TypeError(`Expected 'albums'`);
-        }
-
-        return true;
-      },
-    },
-  },
-
-  sourceGroupByRef: Thing.common.singleReference(Group),
-  sourceAlbumsByRef: Thing.common.referenceList(Album),
-
-  countAlbumsFromGroup: {
-    flags: {update: true, expose: true},
-    update: {validate: isCountingNumber},
-  },
-
-  actionLinks: {
-    flags: {update: true, expose: true},
-    update: {validate: validateArrayItems(isString)},
-  },
-
-  // Expose only
-
-  sourceGroup: Thing.common.dynamicThingFromSingleReference(
-    'sourceGroupByRef',
-    'groupData',
-    find.group
-  ),
-  sourceAlbums: Thing.common.dynamicThingsFromReferenceList(
-    'sourceAlbumsByRef',
-    'albumData',
-    find.album
-  ),
-};
-
-// -> Flash
-
-Flash.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Flash'),
-
-  directory: {
-    flags: {update: true, expose: true},
-    update: {validate: isDirectory},
-
-    // Flashes expose directory differently from other Things! Their
-    // default directory is dependent on the page number (or ID), not
-    // the name.
-    expose: {
-      dependencies: ['page'],
-      transform(directory, {page}) {
-        if (directory === null && page === null) return null;
-        else if (directory === null) return page;
-        else return directory;
-      },
-    },
-  },
-
-  page: {
-    flags: {update: true, expose: true},
-    update: {validate: oneOf(isString, isNumber)},
-
-    expose: {
-      transform: (value) => (value === null ? null : value.toString()),
-    },
-  },
-
-  date: Thing.common.simpleDate(),
-
-  coverArtFileExtension: Thing.common.fileExtension('jpg'),
-
-  contributorContribsByRef: Thing.common.contribsByRef(),
-
-  featuredTracksByRef: Thing.common.referenceList(Track),
-
-  urls: Thing.common.urls(),
-
-  // Update only
-
-  artistData: Thing.common.wikiData(Artist),
-  trackData: Thing.common.wikiData(Track),
-  flashActData: Thing.common.wikiData(FlashAct),
-
-  // Expose only
-
-  contributorContribs: Thing.common.dynamicContribs('contributorContribsByRef'),
-
-  featuredTracks: Thing.common.dynamicThingsFromReferenceList(
-    'featuredTracksByRef',
-    'trackData',
-    find.track
-  ),
-
-  act: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['flashActData'],
-
-      compute: ({flashActData, [Flash.instance]: flash}) =>
-        flashActData.find((act) => act.flashes.includes(flash)) ?? null,
-    },
-  },
-
-  color: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['flashActData'],
-
-      compute: ({flashActData, [Flash.instance]: flash}) =>
-        flashActData.find((act) => act.flashes.includes(flash))?.color ?? null,
-    },
-  },
-};
-
-Flash[S.serializeDescriptors] = {
-  name: S.id,
-  page: S.id,
-  directory: S.id,
-  date: S.id,
-  contributors: S.toContribRefs,
-  tracks: S.toRefs,
-  urls: S.id,
-  color: S.id,
-};
-
-FlashAct.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Flash Act'),
-  color: Thing.common.color(),
-  anchor: Thing.common.simpleString(),
-  jump: Thing.common.simpleString(),
-
-  jumpColor: {
-    flags: {update: true, expose: true},
-    update: {validate: isColor},
-    expose: {
-      dependencies: ['color'],
-      transform: (jumpColor, {color}) =>
-        jumpColor ?? color,
-    }
-  },
-
-  flashesByRef: Thing.common.referenceList(Flash),
-
-  // Update only
-
-  flashData: Thing.common.wikiData(Flash),
-
-  // Expose only
-
-  flashes: Thing.common.dynamicThingsFromReferenceList(
-    'flashesByRef',
-    'flashData',
-    find.flash
-  ),
-};
-
-// -> WikiInfo
-
-WikiInfo.propertyDescriptors = {
-  // Update & expose
-
-  name: Thing.common.name('Unnamed Wiki'),
-
-  // Displayed in nav bar.
-  nameShort: {
-    flags: {update: true, expose: true},
-    update: {validate: isName},
-
-    expose: {
-      dependencies: ['name'],
-      transform: (value, {name}) => value ?? name,
-    },
-  },
-
-  color: Thing.common.color(),
-
-  // One-line description used for <meta rel="description"> tag.
-  description: Thing.common.simpleString(),
-
-  footerContent: Thing.common.simpleString(),
-
-  defaultLanguage: {
-    flags: {update: true, expose: true},
-    update: {validate: isLanguageCode},
-  },
-
-  canonicalBase: {
-    flags: {update: true, expose: true},
-    update: {validate: isURL},
-  },
-
-  divideTrackListsByGroupsByRef: Thing.common.referenceList(Group),
-
-  // Feature toggles
-  enableFlashesAndGames: Thing.common.flag(false),
-  enableListings: Thing.common.flag(false),
-  enableNews: Thing.common.flag(false),
-  enableArtTagUI: Thing.common.flag(false),
-  enableGroupUI: Thing.common.flag(false),
-
-  // Update only
-
-  groupData: Thing.common.wikiData(Group),
-
-  // Expose only
-
-  divideTrackListsByGroups: Thing.common.dynamicThingsFromReferenceList(
-    'divideTrackListsByGroupsByRef',
-    'groupData',
-    find.group
-  ),
-};
-
-// -> Language
-
-const intlHelper = (constructor, opts) => ({
-  flags: {expose: true},
-  expose: {
-    dependencies: ['code', 'intlCode'],
-    compute: ({code, intlCode}) => {
-      const constructCode = intlCode ?? code;
-      if (!constructCode) return null;
-      return Reflect.construct(constructor, [constructCode, opts]);
-    },
-  },
-});
-
-Language.propertyDescriptors = {
-  // Update & expose
-
-  // General language code. This is used to identify the language distinctly
-  // from other languages (similar to how "Directory" operates in many data
-  // objects).
-  code: {
-    flags: {update: true, expose: true},
-    update: {validate: isLanguageCode},
-  },
-
-  // Human-readable name. This should be the language's own native name, not
-  // localized to any other language.
-  name: Thing.common.simpleString(),
-
-  // Language code specific to JavaScript's Internationalization (Intl) API.
-  // Usually this will be the same as the language's general code, but it
-  // may be overridden to provide Intl constructors an alternative value.
-  intlCode: {
-    flags: {update: true, expose: true},
-    update: {validate: isLanguageCode},
-    expose: {
-      dependencies: ['code'],
-      transform: (intlCode, {code}) => intlCode ?? code,
-    },
-  },
-
-  // Flag which represents whether or not to hide a language from general
-  // access. If a language is hidden, its portion of the website will still
-  // be built (with all strings localized to the language), but it won't be
-  // included in controls for switching languages or the <link rel=alternate>
-  // tags used for search engine optimization. This flag is intended for use
-  // with languages that are currently in development and not ready for
-  // formal release, or which are just kept hidden as "experimental zones"
-  // for wiki development or content testing.
-  hidden: Thing.common.flag(false),
-
-  // Mapping of translation keys to values (strings). Generally, don't
-  // access this object directly - use methods instead.
-  strings: {
-    flags: {update: true, expose: true},
-    update: {validate: (t) => typeof t === 'object'},
-    expose: {
-      dependencies: ['inheritedStrings'],
-      transform(strings, {inheritedStrings}) {
-        if (strings || inheritedStrings) {
-          return {...(inheritedStrings ?? {}), ...(strings ?? {})};
-        } else {
-          return null;
-        }
-      },
-    },
-  },
-
-  // May be provided to specify "default" strings, generally (but not
-  // necessarily) inherited from another Language object.
-  inheritedStrings: {
-    flags: {update: true, expose: true},
-    update: {validate: (t) => typeof t === 'object'},
-  },
-
-  // Update only
-
-  escapeHTML: Thing.common.externalFunction(),
-
-  // Expose only
-
-  intl_date: intlHelper(Intl.DateTimeFormat, {full: true}),
-  intl_number: intlHelper(Intl.NumberFormat),
-  intl_listConjunction: intlHelper(Intl.ListFormat, {type: 'conjunction'}),
-  intl_listDisjunction: intlHelper(Intl.ListFormat, {type: 'disjunction'}),
-  intl_listUnit: intlHelper(Intl.ListFormat, {type: 'unit'}),
-  intl_pluralCardinal: intlHelper(Intl.PluralRules, {type: 'cardinal'}),
-  intl_pluralOrdinal: intlHelper(Intl.PluralRules, {type: 'ordinal'}),
-
-  validKeys: {
-    flags: {expose: true},
-
-    expose: {
-      dependencies: ['strings', 'inheritedStrings'],
-      compute: ({strings, inheritedStrings}) =>
-        Array.from(
-          new Set([
-            ...Object.keys(inheritedStrings ?? {}),
-            ...Object.keys(strings ?? {}),
-          ])
-        ),
-    },
-  },
-
-  strings_htmlEscaped: {
-    flags: {expose: true},
-    expose: {
-      dependencies: ['strings', 'inheritedStrings', 'escapeHTML'],
-      compute({strings, inheritedStrings, escapeHTML}) {
-        if (!(strings || inheritedStrings) || !escapeHTML) return null;
-        const allStrings = {...(inheritedStrings ?? {}), ...(strings ?? {})};
-        return Object.fromEntries(
-          Object.entries(allStrings).map(([k, v]) => [k, escapeHTML(v)])
-        );
-      },
-    },
-  },
-};
-
-const countHelper = (stringKey, argName = stringKey) =>
-  function (value, {unit = false} = {}) {
-    return this.$(
-      unit
-        ? `count.${stringKey}.withUnit.` + this.getUnitForm(value)
-        : `count.${stringKey}`,
-      {[argName]: this.formatNumber(value)}
-    );
-  };
-
-Object.assign(Language.prototype, {
-  $(key, args = {}) {
-    return this.formatString(key, args);
-  },
-
-  assertIntlAvailable(property) {
-    if (!this[property]) {
-      throw new Error(`Intl API ${property} unavailable`);
-    }
-  },
-
-  getUnitForm(value) {
-    this.assertIntlAvailable('intl_pluralCardinal');
-    return this.intl_pluralCardinal.select(value);
-  },
-
-  formatString(key, args = {}) {
-    if (this.strings && !this.strings_htmlEscaped) {
-      throw new Error(`HTML-escaped strings unavailable - please ensure escapeHTML function is provided`);
-    }
-
-    return this.formatStringHelper(this.strings_htmlEscaped, key, args);
-  },
-
-  formatStringNoHTMLEscape(key, args = {}) {
-    return this.formatStringHelper(this.strings, key, args);
-  },
-
-  formatStringHelper(strings, key, args = {}) {
-    if (!strings) {
-      throw new Error(`Strings unavailable`);
-    }
-
-    if (!this.validKeys.includes(key)) {
-      throw new Error(`Invalid key ${key} accessed`);
-    }
-
-    const template = strings[key];
-
-    // Convert the keys on the args dict from camelCase to CONSTANT_CASE.
-    // (This isn't an OUTRAGEOUSLY versatile algorithm for doing that, 8ut
-    // like, who cares, dude?) Also, this is an array, 8ecause it's handy
-    // for the iterating we're a8out to do.
-    const processedArgs = Object.entries(args).map(([k, v]) => [
-      k.replace(/[A-Z]/g, '_$&').toUpperCase(),
-      v,
-    ]);
-
-    // Replacement time! Woot. Reduce comes in handy here!
-    const output = processedArgs.reduce(
-      (x, [k, v]) => x.replaceAll(`{${k}}`, v),
-      template
-    );
-
-    // Post-processing: if any expected arguments *weren't* replaced, that
-    // is almost definitely an error.
-    if (output.match(/\{[A-Z_]+\}/)) {
-      throw new Error(`Args in ${key} were missing - output: ${output}`);
-    }
-
-    return output;
-  },
-
-  formatDate(date) {
-    this.assertIntlAvailable('intl_date');
-    return this.intl_date.format(date);
-  },
-
-  formatDateRange(startDate, endDate) {
-    this.assertIntlAvailable('intl_date');
-    return this.intl_date.formatRange(startDate, endDate);
-  },
-
-  formatDuration(secTotal, {approximate = false, unit = false} = {}) {
-    if (secTotal === 0) {
-      return this.formatString('count.duration.missing');
-    }
-
-    const hour = Math.floor(secTotal / 3600);
-    const min = Math.floor((secTotal - hour * 3600) / 60);
-    const sec = Math.floor(secTotal - hour * 3600 - min * 60);
-
-    const pad = (val) => val.toString().padStart(2, '0');
-
-    const stringSubkey = unit ? '.withUnit' : '';
-
-    const duration =
-      hour > 0
-        ? this.formatString('count.duration.hours' + stringSubkey, {
-            hours: hour,
-            minutes: pad(min),
-            seconds: pad(sec),
-          })
-        : this.formatString('count.duration.minutes' + stringSubkey, {
-            minutes: min,
-            seconds: pad(sec),
-          });
-
-    return approximate
-      ? this.formatString('count.duration.approximate', {duration})
-      : duration;
-  },
-
-  formatIndex(value) {
-    this.assertIntlAvailable('intl_pluralOrdinal');
-    return this.formatString('count.index.' + this.intl_pluralOrdinal.select(value), {index: value});
-  },
-
-  formatNumber(value) {
-    this.assertIntlAvailable('intl_number');
-    return this.intl_number.format(value);
-  },
-
-  formatWordCount(value) {
-    const num = this.formatNumber(
-      value > 1000 ? Math.floor(value / 100) / 10 : value
-    );
-
-    const words =
-      value > 1000
-        ? this.formatString('count.words.thousand', {words: num})
-        : this.formatString('count.words', {words: num});
-
-    return this.formatString('count.words.withUnit.' + this.getUnitForm(value), {words});
-  },
-
-  // Conjunction list: A, B, and C
-  formatConjunctionList(array) {
-    this.assertIntlAvailable('intl_listConjunction');
-    return this.intl_listConjunction.format(array);
-  },
-
-  // Disjunction lists: A, B, or C
-  formatDisjunctionList(array) {
-    this.assertIntlAvailable('intl_listDisjunction');
-    return this.intl_listDisjunction.format(array);
-  },
-
-  // Unit lists: A, B, C
-  formatUnitList(array) {
-    this.assertIntlAvailable('intl_listUnit');
-    return this.intl_listUnit.format(array);
-  },
-
-  // File sizes: 42.5 kB, 127.2 MB, 4.13 GB, 998.82 TB
-  formatFileSize(bytes) {
-    if (!bytes) return '';
-
-    bytes = parseInt(bytes);
-    if (isNaN(bytes)) return '';
-
-    const round = (exp) => Math.round(bytes / 10 ** (exp - 1)) / 10;
-
-    if (bytes >= 10 ** 12) {
-      return this.formatString('count.fileSize.terabytes', {
-        terabytes: round(12),
-      });
-    } else if (bytes >= 10 ** 9) {
-      return this.formatString('count.fileSize.gigabytes', {
-        gigabytes: round(9),
-      });
-    } else if (bytes >= 10 ** 6) {
-      return this.formatString('count.fileSize.megabytes', {
-        megabytes: round(6),
-      });
-    } else if (bytes >= 10 ** 3) {
-      return this.formatString('count.fileSize.kilobytes', {
-        kilobytes: round(3),
-      });
-    } else {
-      return this.formatString('count.fileSize.bytes', {bytes});
-    }
-  },
-
-  // TODO: These are hard-coded. Is there a better way?
-  countAdditionalFiles: countHelper('additionalFiles', 'files'),
-  countAlbums: countHelper('albums'),
-  countCommentaryEntries: countHelper('commentaryEntries', 'entries'),
-  countContributions: countHelper('contributions'),
-  countCoverArts: countHelper('coverArts'),
-  countTimesReferenced: countHelper('timesReferenced'),
-  countTimesUsed: countHelper('timesUsed'),
-  countTracks: countHelper('tracks'),
-});