2025年5月23日、MicrosoftのTypeScriptチームはTypeScript 7で導入予定の新コンパイラ「tsgo」のプレビュー版を公開しました。このコンパイラはGo言語で実装されており、従来のtscコンパイラと比較して最大10倍の高速化を実現すると発表されています。
ちょうどこの5月23日はtskaigi2025が東京・神田で開催されイベントはめちゃくちゃ盛り上がっていました
そこで今回は、音楽ストリーミングプラットフォームという複雑なドメインを例に、合計2,306行のTypeScriptコードベースを使ってtsgoの性能を実際に検証し、どのくらい高速化をしたかを調べます！
tsgoとは？
tsgoは、TypeScript 7で導入される予定のGo言語実装による新しいTypeScriptコンパイラです。現在のtscコンパイラがTypeScriptで書かれているのに対し、tsgoはネイティブコードであるGo言語で実装されています。
主な特徴
- ネイティブコンパイル: Go言語による高速なネイティブ実行
- 並列処理: 共有メモリ並列処理の最大活用
- メモリ効率: 従来比で大幅なメモリ使用量削減
- 互換性: 既存のtscコマンドとの高い互換性
tsgoのインストール手順
tsgoのインストール手順は次の通りです。新しくリリースされた @typescript/native-preview パッケージをインストールします。
npm install -D @typescript/native-preview
tsgo のバージョンを確認してみましょう。
npx tsgo -v
tsgoによるコンパイルを試すために、TypeScriptパッケージもインストールしておきます。
npm install -D typescript
次に、tsconfig.json ファイルを作成します。tsgoはまだプレビュー版であり、--init のようなプロジェクト初期化機能は提供されていないため、既存のtscコマンドで生成します。
npx tsc --init
これで基本的なtsgo環境のセットアップが完了します。
検証環境とコード構成
検証環境
- プラットフォーム: macOS (darwin-arm64)
- Node.js: v24.5.0
- TypeScript: 5.6.3
- tsgo: 7.0.0-dev.20250823.8
コード構成
今回の検証では、音楽ストリーミングプラットフォームを模したのAPIとフロントエンド(tsxファイル)で検証します。今回はフロントエンドとバックエンドそれぞれ1ファイルにまとめて記載しています。
-
APIコード (
src/music-streaming-api.ts) - 1,073行
// Branded Types
type UUID = string & { readonly brand: unique symbol };
type Duration = number & { readonly brand: unique symbol };
// 条件型を使った高度な型定義
type ExtractEventByType<T extends MusicEvent, U extends EventType> =
T extends BaseEvent<U> ? T : never;
// Mapped Typesを使った型変換
type EventHandlers = {
[K in EventType]: (event: ExtractEventByType<MusicEvent, K>) => Promise<void>;
};
// ジェネリクス
interface ListProps<T> extends BaseComponentProps {
items: T[];
renderItem: (item: T, index: number) => ReactElement;
keyExtractor: (item: T, index: number) => string | number;
virtualScrolling?: boolean;
}
APIコード全文(結構長いので読みたい方のみで)
/**
* 音楽ストリーミングプラットフォーム API
* TypeScript 高度な型システムを活用した実装例
*/
// ========== 基本型定義 ==========
type UUID = string & { readonly brand: unique symbol };
type Timestamp = number & { readonly brand: unique symbol };
type Duration = number & { readonly brand: unique symbol }; // milliseconds
type BitrateKbps = number & { readonly brand: unique symbol };
type RatingScore = number & { readonly brand: unique symbol }; // 0-5
type PlayCount = number & { readonly brand: unique symbol };
// UUID生成関数
function createUUID(): UUID {
return crypto.randomUUID() as UUID;
}
// Timestamp生成関数
function createTimestamp(): Timestamp {
return Date.now() as Timestamp;
}
// ========== 列挙型定義 ==========
enum AudioQuality {
LOW = 'low',
MEDIUM = 'medium',
HIGH = 'high',
LOSSLESS = 'lossless',
HIRES = 'hires'
}
enum Genre {
POP = 'pop',
ROCK = 'rock',
JAZZ = 'jazz',
CLASSICAL = 'classical',
ELECTRONIC = 'electronic',
HIPHOP = 'hiphop',
R_AND_B = 'r_and_b',
COUNTRY = 'country',
FOLK = 'folk',
BLUES = 'blues',
REGGAE = 'reggae',
METAL = 'metal',
PUNK = 'punk',
ALTERNATIVE = 'alternative',
AMBIENT = 'ambient'
}
enum UserSubscriptionType {
FREE = 'free',
PREMIUM = 'premium',
FAMILY = 'family',
STUDENT = 'student'
}
enum PlaylistVisibility {
PUBLIC = 'public',
PRIVATE = 'private',
FRIENDS_ONLY = 'friends_only'
}
enum DeviceType {
WEB = 'web',
MOBILE = 'mobile',
DESKTOP = 'desktop',
SMART_SPEAKER = 'smart_speaker',
TV = 'tv',
CAR = 'car'
}
enum PlaybackStateEnum {
PLAYING = 'playing',
PAUSED = 'paused',
STOPPED = 'stopped',
BUFFERING = 'buffering',
ERROR = 'error'
}
// ========== 基本インターフェース ==========
interface BaseEntity {
readonly id: UUID;
readonly createdAt: Timestamp;
readonly updatedAt: Timestamp;
}
interface Searchable {
readonly searchKeywords: string[];
readonly searchVector?: Float64Array;
}
interface Rateable {
readonly averageRating: RatingScore;
readonly ratingCount: number;
}
interface Playable {
readonly duration: Duration;
readonly playCount: PlayCount;
readonly isExplicit: boolean;
}
interface Taggable {
readonly tags: string[];
}
// ========== アーティスト関連 ==========
interface ArtistProfile extends BaseEntity, Searchable, Rateable {
readonly name: string;
readonly biography: string;
readonly imageUrl?: string;
readonly verifiedStatus: boolean;
readonly monthlyListeners: number;
readonly genres: Genre[];
readonly socialLinks: Record<string, string>;
readonly countryOfOrigin?: string;
readonly debutYear?: number;
}
interface ArtistStats {
readonly totalPlayCount: PlayCount;
readonly totalLikes: number;
readonly totalFollowers: number;
readonly topCountries: Array<{
country: string;
percentage: number;
}>;
readonly monthlyData: Array<{
month: string;
plays: PlayCount;
listeners: number;
}>;
}
// ========== トラック関連 ==========
interface TrackMetadata extends BaseEntity, Searchable, Rateable, Playable, Taggable {
readonly title: string;
readonly artistIds: UUID[];
readonly albumId?: UUID;
readonly genre: Genre;
readonly releaseDate: Timestamp;
readonly lyrics?: string;
readonly bpm?: number;
readonly key?: string;
readonly mood?: string[];
}
interface TrackAudioFile {
readonly url: string;
readonly quality: AudioQuality;
readonly bitrate: BitrateKbps;
readonly format: string;
readonly size: number;
readonly checksum: string;
}
interface Track extends TrackMetadata {
readonly audioFiles: TrackAudioFile[];
readonly waveformData?: Float32Array;
readonly isrcCode?: string;
readonly copyrightInfo: {
readonly owner: string;
readonly year: number;
};
}
// ========== アルバム関連 ==========
interface AlbumInfo extends BaseEntity, Searchable, Rateable, Taggable {
readonly title: string;
readonly artistIds: UUID[];
readonly releaseDate: Timestamp;
readonly genre: Genre;
readonly trackIds: UUID[];
readonly coverImageUrl?: string;
readonly recordLabel?: string;
readonly catalogNumber?: string;
readonly totalDuration: Duration;
readonly albumType: 'album' | 'ep' | 'single' | 'compilation';
}
// ========== プレイリスト関連 ==========
interface PlaylistItem {
readonly trackId: UUID;
readonly addedAt: Timestamp;
readonly addedBy: UUID;
readonly position: number;
}
interface Playlist extends BaseEntity, Searchable {
readonly name: string;
readonly description?: string;
readonly ownerId: UUID;
readonly visibility: PlaylistVisibility;
readonly items: PlaylistItem[];
readonly imageUrl?: string;
readonly followerCount: number;
readonly totalDuration: Duration;
readonly isCollaborative: boolean;
readonly collaboratorIds: UUID[];
}
// ========== ユーザー関連 ==========
interface UserProfile extends BaseEntity {
readonly username: string;
readonly email: string;
readonly displayName: string;
readonly avatarUrl?: string;
readonly subscriptionType: UserSubscriptionType;
readonly subscriptionExpiresAt?: Timestamp;
readonly country: string;
readonly language: string;
readonly dateOfBirth?: Timestamp;
readonly isEmailVerified: boolean;
readonly lastLoginAt: Timestamp;
}
interface UserPreferences {
readonly audioQuality: AudioQuality;
readonly autoPlay: boolean;
readonly crossfade: boolean;
readonly crossfadeDuration: Duration;
readonly normalizeVolume: boolean;
readonly showExplicitContent: boolean;
readonly privateSessions: boolean;
readonly allowDataCollection: boolean;
readonly preferredGenres: Genre[];
readonly blockedArtists: UUID[];
}
interface UserLibrary {
readonly likedTracks: UUID[];
readonly followedArtists: UUID[];
readonly savedAlbums: UUID[];
readonly createdPlaylists: UUID[];
readonly followedPlaylists: UUID[];
readonly recentlyPlayed: Array<{
trackId: UUID;
playedAt: Timestamp;
playDuration: Duration;
}>;
}
// ========== デバイス・再生関連 ==========
interface Device extends BaseEntity {
readonly name: string;
readonly type: DeviceType;
readonly isActive: boolean;
readonly isPrivateSession: boolean;
readonly volumePercent: number;
readonly supportsVolume: boolean;
readonly isRestricted: boolean;
readonly lastSeen: Timestamp;
readonly userId: UUID;
}
interface PlaybackContext {
readonly uri: string;
readonly type: 'album' | 'artist' | 'playlist' | 'track';
readonly shuffleState: boolean;
readonly repeatState: 'off' | 'context' | 'track';
}
interface PlaybackState {
readonly device: Device;
readonly track?: Track;
readonly context?: PlaybackContext;
readonly timestamp: Timestamp;
readonly progressMs: Duration;
readonly isPlaying: boolean;
readonly currentlyPlayingType: 'track' | 'episode' | 'ad' | 'unknown';
readonly actions: {
readonly disallowsSkippingNext: boolean;
readonly disallowsSkippingPrev: boolean;
readonly disallowsTogglingRepeatContext: boolean;
readonly disallowsTogglingRepeatTrack: boolean;
readonly disallowsToggglingShuffle: boolean;
};
}
// ========== 高度な型とジェネリクス ==========
type EventType = 'play' | 'pause' | 'skip' | 'seek' | 'like' | 'share' | 'add_to_playlist';
interface BaseEvent<T extends EventType> extends BaseEntity {
readonly type: T;
readonly userId: UUID;
readonly deviceId: UUID;
readonly sessionId: string;
}
interface PlayEvent extends BaseEvent<'play'> {
readonly trackId: UUID;
readonly playbackContext?: PlaybackContext;
readonly audioQuality: AudioQuality;
}
interface SeekEvent extends BaseEvent<'seek'> {
readonly trackId: UUID;
readonly fromPosition: Duration;
readonly toPosition: Duration;
}
interface LikeEvent extends BaseEvent<'like'> {
readonly targetType: 'track' | 'album' | 'artist' | 'playlist';
readonly targetId: UUID;
readonly isLike: boolean;
}
type MusicEvent = PlayEvent | SeekEvent | LikeEvent;
// 条件型を使った高度な型
type ExtractEventByType<T extends MusicEvent, U extends EventType> =
T extends BaseEvent<U> ? T : never;
type PlayEventsOnly = ExtractEventByType<MusicEvent, 'play'>;
// Mapped Typesを使った型変換
type EventHandlers = {
[K in EventType]: (event: ExtractEventByType<MusicEvent, K>) => Promise<void>;
};
// ========== レコメンデーション関連 ==========
interface RecommendationSeed {
readonly type: 'artist' | 'track' | 'genre';
readonly id: string;
readonly weight: number;
}
interface RecommendationParams {
readonly seeds: RecommendationSeed[];
readonly limit: number;
readonly market?: string;
readonly tunableAttributes?: {
readonly acousticness?: [number, number];
readonly danceability?: [number, number];
readonly energy?: [number, number];
readonly instrumentalness?: [number, number];
readonly liveness?: [number, number];
readonly loudness?: [number, number];
readonly speechiness?: [number, number];
readonly tempo?: [number, number];
readonly valence?: [number, number];
};
}
interface AudioFeatures {
readonly acousticness: number;
readonly danceability: number;
readonly energy: number;
readonly instrumentalness: number;
readonly liveness: number;
readonly loudness: number;
readonly speechiness: number;
readonly tempo: number;
readonly timeSignature: number;
readonly valence: number;
readonly key: number;
readonly mode: number;
}
// ========== API サービスクラス群 ==========
abstract class BaseService<T extends BaseEntity> {
protected abstract entityName: string;
abstract create(data: Omit<T, keyof BaseEntity>): Promise<T>;
abstract findById(id: UUID): Promise<T | null>;
abstract update(id: UUID, data: Partial<T>): Promise<T>;
abstract delete(id: UUID): Promise<boolean>;
abstract findMany(params: Record<string, any>): Promise<T[]>;
protected validateEntity(entity: any): entity is T {
return entity &&
typeof entity.id === 'string' &&
typeof entity.createdAt === 'number' &&
typeof entity.updatedAt === 'number';
}
}
class ArtistService extends BaseService<ArtistProfile> {
protected entityName = 'artist';
async create(data: Omit<ArtistProfile, keyof BaseEntity>): Promise<ArtistProfile> {
const now = createTimestamp();
return {
...data,
id: createUUID(),
createdAt: now,
updatedAt: now,
};
}
async findById(id: UUID): Promise<ArtistProfile | null> {
// 実装省略
return null;
}
async update(id: UUID, data: Partial<ArtistProfile>): Promise<ArtistProfile> {
// 実装省略
throw new Error('Not implemented');
}
async delete(id: UUID): Promise<boolean> {
// 実装省略
return false;
}
async findMany(params: Record<string, any>): Promise<ArtistProfile[]> {
// 実装省略
return [];
}
async getArtistStats(artistId: UUID): Promise<ArtistStats> {
// 実装省略
return {
totalPlayCount: 0 as PlayCount,
totalLikes: 0,
totalFollowers: 0,
topCountries: [],
monthlyData: []
};
}
async getTopTracks(artistId: UUID, market?: string): Promise<Track[]> {
// 実装省略
return [];
}
async searchArtists(query: string, limit: number = 20): Promise<ArtistProfile[]> {
// 実装省略
return [];
}
}
class TrackService extends BaseService<Track> {
protected entityName = 'track';
async create(data: Omit<Track, keyof BaseEntity>): Promise<Track> {
const now = createTimestamp();
return {
...data,
id: createUUID(),
createdAt: now,
updatedAt: now,
};
}
async findById(id: UUID): Promise<Track | null> {
// 実装省略
return null;
}
async update(id: UUID, data: Partial<Track>): Promise<Track> {
// 実装省略
throw new Error('Not implemented');
}
async delete(id: UUID): Promise<boolean> {
// 実装省略
return false;
}
async findMany(params: Record<string, any>): Promise<Track[]> {
// 実装省略
return [];
}
async getAudioFeatures(trackId: UUID): Promise<AudioFeatures> {
// 実装省略
return {
acousticness: 0,
danceability: 0,
energy: 0,
instrumentalness: 0,
liveness: 0,
loudness: 0,
speechiness: 0,
tempo: 0,
timeSignature: 4,
valence: 0,
key: 0,
mode: 0
};
}
async incrementPlayCount(trackId: UUID): Promise<void> {
// 実装省略
}
async searchTracks(query: string, limit: number = 20): Promise<Track[]> {
// 実装省略
return [];
}
}
class PlaylistService extends BaseService<Playlist> {
protected entityName = 'playlist';
async create(data: Omit<Playlist, keyof BaseEntity>): Promise<Playlist> {
const now = createTimestamp();
return {
...data,
id: createUUID(),
createdAt: now,
updatedAt: now,
};
}
async findById(id: UUID): Promise<Playlist | null> {
// 実装省略
return null;
}
async update(id: UUID, data: Partial<Playlist>): Promise<Playlist> {
// 実装省略
throw new Error('Not implemented');
}
async delete(id: UUID): Promise<boolean> {
// 実装省略
return false;
}
async findMany(params: Record<string, any>): Promise<Playlist[]> {
// 実装省略
return [];
}
async addTrack(playlistId: UUID, trackId: UUID, position?: number): Promise<void> {
// 実装省略
}
async removeTrack(playlistId: UUID, trackId: UUID, positions?: number[]): Promise<void> {
// 実装省略
}
async reorderTracks(playlistId: UUID, rangeStart: number, insertBefore: number, rangeLength?: number): Promise<void> {
// 実装省略
}
async followPlaylist(playlistId: UUID, userId: UUID): Promise<void> {
// 実装省略
}
async unfollowPlaylist(playlistId: UUID, userId: UUID): Promise<void> {
// 実装省略
}
}
class UserService extends BaseService<UserProfile> {
protected entityName = 'user';
async create(data: Omit<UserProfile, keyof BaseEntity>): Promise<UserProfile> {
const now = createTimestamp();
return {
...data,
id: createUUID(),
createdAt: now,
updatedAt: now,
};
}
async findById(id: UUID): Promise<UserProfile | null> {
// 実装省略
return null;
}
async update(id: UUID, data: Partial<UserProfile>): Promise<UserProfile> {
// 実装省略
throw new Error('Not implemented');
}
async delete(id: UUID): Promise<boolean> {
// 実装省略
return false;
}
async findMany(params: Record<string, any>): Promise<UserProfile[]> {
// 実装省略
return [];
}
async getUserPreferences(userId: UUID): Promise<UserPreferences> {
// 実装省略
return {
audioQuality: AudioQuality.HIGH,
autoPlay: true,
crossfade: false,
crossfadeDuration: 0 as Duration,
normalizeVolume: true,
showExplicitContent: true,
privateSessions: false,
allowDataCollection: true,
preferredGenres: [],
blockedArtists: []
};
}
async updateUserPreferences(userId: UUID, preferences: Partial<UserPreferences>): Promise<UserPreferences> {
// 実装省略
throw new Error('Not implemented');
}
async getUserLibrary(userId: UUID): Promise<UserLibrary> {
// 実装省略
return {
likedTracks: [],
followedArtists: [],
savedAlbums: [],
createdPlaylists: [],
followedPlaylists: [],
recentlyPlayed: []
};
}
async followArtist(userId: UUID, artistId: UUID): Promise<void> {
// 実装省略
}
async unfollowArtist(userId: UUID, artistId: UUID): Promise<void> {
// 実装省略
}
async saveTrack(userId: UUID, trackId: UUID): Promise<void> {
// 実装省略
}
async removeTrack(userId: UUID, trackId: UUID): Promise<void> {
// 実装省略
}
}
// ========== レコメンデーションエンジン ==========
class RecommendationEngine {
private trackService: TrackService;
private userService: UserService;
constructor(trackService: TrackService, userService: UserService) {
this.trackService = trackService;
this.userService = userService;
}
async getRecommendations(userId: UUID, params: RecommendationParams): Promise<Track[]> {
const userLibrary = await this.userService.getUserLibrary(userId);
const userPreferences = await this.userService.getUserPreferences(userId);
// 実装省略 - 機械学習ベースのレコメンデーション
return [];
}
async getPersonalizedRecommendations(userId: UUID, limit: number = 20): Promise<Track[]> {
// ユーザーの履歴と好みを分析してパーソナライズされたレコメンデーションを生成
return [];
}
async getSimilarTracks(trackId: UUID, limit: number = 20): Promise<Track[]> {
const audioFeatures = await this.trackService.getAudioFeatures(trackId);
// 音響特徴量を使った類似楽曲検索
return [];
}
private calculateSimilarity(features1: AudioFeatures, features2: AudioFeatures): number {
// コサイン類似度やユークリッド距離を使った類似度計算
const keys = Object.keys(features1) as Array<keyof AudioFeatures>;
let dotProduct = 0;
let magnitude1 = 0;
let magnitude2 = 0;
for (const key of keys) {
const val1 = features1[key];
const val2 = features2[key];
dotProduct += val1 * val2;
magnitude1 += val1 * val1;
magnitude2 += val2 * val2;
}
return dotProduct / (Math.sqrt(magnitude1) * Math.sqrt(magnitude2));
}
}
// ========== 音楽再生管理 ==========
class PlaybackManager {
private currentDevice?: Device;
private currentState: PlaybackState | null = null;
private eventHandlers: Partial<EventHandlers> = {};
async setDevice(device: Device): Promise<void> {
this.currentDevice = device;
}
async play(trackId: UUID, context?: PlaybackContext): Promise<void> {
if (!this.currentDevice) {
throw new Error('No active device');
}
const event: PlayEvent = {
id: createUUID(),
type: 'play',
userId: this.currentDevice.userId,
deviceId: this.currentDevice.id,
sessionId: crypto.randomUUID(),
createdAt: createTimestamp(),
updatedAt: createTimestamp(),
trackId,
playbackContext: context,
audioQuality: AudioQuality.HIGH
};
await this.handleEvent(event);
}
async pause(): Promise<void> {
if (!this.currentDevice) {
throw new Error('No active device');
}
// pause event handling
}
async seek(position: Duration): Promise<void> {
if (!this.currentDevice || !this.currentState?.track) {
throw new Error('No active playback');
}
const event: SeekEvent = {
id: createUUID(),
type: 'seek',
userId: this.currentDevice.userId,
deviceId: this.currentDevice.id,
sessionId: crypto.randomUUID(),
createdAt: createTimestamp(),
updatedAt: createTimestamp(),
trackId: this.currentState.track.id,
fromPosition: this.currentState.progressMs,
toPosition: position
};
await this.handleEvent(event);
}
private async handleEvent<T extends EventType>(event: ExtractEventByType<MusicEvent, T>): Promise<void> {
const handler = this.eventHandlers[event.type];
if (handler) {
await handler(event as any);
}
}
addEventListener<T extends EventType>(type: T, handler: (event: ExtractEventByType<MusicEvent, T>) => Promise<void>): void {
this.eventHandlers[type] = handler as any;
}
removeEventListener<T extends EventType>(type: T): void {
delete this.eventHandlers[type];
}
getCurrentState(): PlaybackState | null {
return this.currentState;
}
}
// ========== 検索エンジン ==========
interface SearchResult<T> {
items: T[];
total: number;
limit: number;
offset: number;
}
interface SearchQuery {
q: string;
type: ('track' | 'artist' | 'album' | 'playlist')[];
limit?: number;
offset?: number;
market?: string;
}
class SearchEngine {
private artistService: ArtistService;
private trackService: TrackService;
private playlistService: PlaylistService;
constructor(
artistService: ArtistService,
trackService: TrackService,
playlistService: PlaylistService
) {
this.artistService = artistService;
this.trackService = trackService;
this.playlistService = playlistService;
}
async search(query: SearchQuery): Promise<{
tracks?: SearchResult<Track>;
artists?: SearchResult<ArtistProfile>;
albums?: SearchResult<AlbumInfo>;
playlists?: SearchResult<Playlist>;
}> {
const results: any = {};
const { q, type, limit = 20, offset = 0 } = query;
if (type.includes('track')) {
const tracks = await this.trackService.searchTracks(q, limit);
results.tracks = {
items: tracks,
total: tracks.length,
limit,
offset
};
}
if (type.includes('artist')) {
const artists = await this.artistService.searchArtists(q, limit);
results.artists = {
items: artists,
total: artists.length,
limit,
offset
};
}
// アルバムとプレイリストの検索も同様に実装
return results;
}
async autocomplete(query: string, limit: number = 10): Promise<string[]> {
// 自動補完の実装
return [];
}
async getTopSearches(country?: string): Promise<string[]> {
// 人気検索キーワードの取得
return [];
}
}
// ========== 型ガード関数群 ==========
function isPlayEvent(event: MusicEvent): event is PlayEvent {
return event.type === 'play';
}
function isSeekEvent(event: MusicEvent): event is SeekEvent {
return event.type === 'seek';
}
function isLikeEvent(event: MusicEvent): event is LikeEvent {
return event.type === 'like';
}
function isValidAudioQuality(quality: string): quality is AudioQuality {
return Object.values(AudioQuality).includes(quality as AudioQuality);
}
function isValidGenre(genre: string): genre is Genre {
return Object.values(Genre).includes(genre as Genre);
}
function isValidSubscriptionType(type: string): type is UserSubscriptionType {
return Object.values(UserSubscriptionType).includes(type as UserSubscriptionType);
}
function isValidDeviceType(type: string): type is DeviceType {
return Object.values(DeviceType).includes(type as DeviceType);
}
// ========== ユーティリティ関数 ==========
function formatDuration(duration: Duration): string {
const seconds = Math.floor(duration / 1000);
const minutes = Math.floor(seconds / 60);
const remainingSeconds = seconds % 60;
if (minutes >= 60) {
const hours = Math.floor(minutes / 60);
const remainingMinutes = minutes % 60;
return `${hours}:${remainingMinutes.toString().padStart(2, '0')}:${remainingSeconds.toString().padStart(2, '0')}`;
}
return `${minutes}:${remainingSeconds.toString().padStart(2, '0')}`;
}
function calculateBitrate(fileSize: number, duration: Duration): BitrateKbps {
return Math.round((fileSize * 8) / (duration / 1000) / 1000) as BitrateKbps;
}
function generatePlaylistName(genres: Genre[], mood?: string): string {
if (mood) {
return `${mood} ${genres[0]} Mix`;
}
if (genres.length === 1) {
return `${genres[0]} Playlist`;
}
return `${genres[0]} & ${genres[1]} Mix`;
}
function normalizeSearchQuery(query: string): string {
return query
.toLowerCase()
.trim()
.replace(/[^\w\s]/g, '')
.replace(/\s+/g, ' ');
}
// ========== メイン API クラス ==========
export class MusicStreamingAPI {
private artistService: ArtistService;
private trackService: TrackService;
private playlistService: PlaylistService;
private userService: UserService;
private recommendationEngine: RecommendationEngine;
private playbackManager: PlaybackManager;
private searchEngine: SearchEngine;
constructor() {
this.artistService = new ArtistService();
this.trackService = new TrackService();
this.playlistService = new PlaylistService();
this.userService = new UserService();
this.recommendationEngine = new RecommendationEngine(this.trackService, this.userService);
this.playbackManager = new PlaybackManager();
this.searchEngine = new SearchEngine(this.artistService, this.trackService, this.playlistService);
}
// Artist endpoints
async getArtist(id: UUID): Promise<ArtistProfile | null> {
return this.artistService.findById(id);
}
async getArtistTopTracks(id: UUID, market?: string): Promise<Track[]> {
return this.artistService.getTopTracks(id, market);
}
// Track endpoints
async getTrack(id: UUID): Promise<Track | null> {
return this.trackService.findById(id);
}
async getTrackAudioFeatures(id: UUID): Promise<AudioFeatures> {
return this.trackService.getAudioFeatures(id);
}
// User endpoints
async getCurrentUser(userId: UUID): Promise<UserProfile | null> {
return this.userService.findById(userId);
}
async getUserLibrary(userId: UUID): Promise<UserLibrary> {
return this.userService.getUserLibrary(userId);
}
// Playlist endpoints
async getPlaylist(id: UUID): Promise<Playlist | null> {
return this.playlistService.findById(id);
}
async createPlaylist(userId: UUID, name: string, description?: string): Promise<Playlist> {
return this.playlistService.create({
name,
description,
ownerId: userId,
visibility: PlaylistVisibility.PRIVATE,
items: [],
followerCount: 0,
totalDuration: 0 as Duration,
isCollaborative: false,
collaboratorIds: [],
searchKeywords: [name.toLowerCase()]
});
}
// Search endpoints
async search(query: SearchQuery): Promise<any> {
return this.searchEngine.search(query);
}
// Recommendation endpoints
async getRecommendations(userId: UUID, params: RecommendationParams): Promise<Track[]> {
return this.recommendationEngine.getRecommendations(userId, params);
}
// Playback endpoints
async play(trackId: UUID, deviceId: UUID): Promise<void> {
// デバイス設定とプレイバック開始の実装
}
async pause(deviceId: UUID): Promise<void> {
await this.playbackManager.pause();
}
async getCurrentPlayback(): Promise<PlaybackState | null> {
return this.playbackManager.getCurrentState();
}
}
// ========== エラーハンドリング ==========
class MusicAPIError extends Error {
constructor(
public code: string,
message: string,
public statusCode: number = 500
) {
super(message);
this.name = 'MusicAPIError';
}
}
class NotFoundError extends MusicAPIError {
constructor(resource: string, id: string) {
super('NOT_FOUND', `${resource} with id ${id} not found`, 404);
}
}
class ValidationError extends MusicAPIError {
constructor(message: string) {
super('VALIDATION_ERROR', message, 400);
}
}
class UnauthorizedError extends MusicAPIError {
constructor(message: string = 'Unauthorized') {
super('UNAUTHORIZED', message, 401);
}
}
// ========== エクスポート ==========
export {
// Types
UUID, Timestamp, Duration, BitrateKbps, RatingScore, PlayCount,
// Enums
AudioQuality, Genre, UserSubscriptionType, PlaylistVisibility, DeviceType, PlaybackStateEnum,
// Interfaces
ArtistProfile, Track, Playlist, UserProfile, UserLibrary, AudioFeatures, RecommendationParams, SearchQuery, PlaybackState,
// Services
ArtistService, TrackService, PlaylistService, UserService,
// Engines
RecommendationEngine, SearchEngine,
// Managers
PlaybackManager,
// Errors
MusicAPIError, NotFoundError, ValidationError, UnauthorizedError,
// Utilities
formatDuration, calculateBitrate, generatePlaylistName, normalizeSearchQuery,
// Type Guards
isPlayEvent, isSeekEvent, isLikeEvent, isValidAudioQuality, isValidGenre
};
-
フロントエンドコード (
src/music-streaming-frontend.tsx) - 1,232行
// 条件型を使った高度な型定義
type RequiredKeys<T> = {
[K in keyof T]-?: {} extends Pick<T, K> ? never : K;
}[keyof T];
type OptionalKeys<T> = {
[K in keyof T]-?: {} extends Pick<T, K> ? K : never;
}[keyof T];
// Mapped Types による柔軟な型変換
type PartialBy<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;
type RequiredBy<T, K extends keyof T> = Omit<T, K> & Required<Pick<T, K>>;
// Template Literal Types
type ColorScheme = 'light' | 'dark' | 'auto';
type ThemeColor = `--theme-${string}`;
type ResponsiveClass = `${BreakpointPrefix}:${string}`;
// 複雑なDiscriminated Union
type PlaybackAction =
| { type: 'PLAY'; payload: { trackId: UUID; position?: number } }
| { type: 'PAUSE' }
| { type: 'SEEK'; payload: { position: number } }
| { type: 'VOLUME_CHANGE'; payload: { volume: number } };
// 高度なReact型パターン
interface ListProps<T> extends BaseComponentProps {
items: T[];
renderItem: (item: T, index: number) => ReactElement;
keyExtractor: (item: T, index: number) => string | number;
virtualScrolling?: boolean;
onEndReached?: () => Promise<void>;
}
// Context API + Generics
interface MusicPlayerContextValue {
currentTrack: Track | null;
playbackState: PlaybackState | null;
play: (track: Track, playlist?: Playlist) => Promise<void>;
dispatch: React.Dispatch<PlaybackAction>;
}
// カスタムフックの型定義
interface UseVirtualScrollOptions<T> {
items: T[];
itemHeight: number | ((item: T, index: number) => number);
containerHeight: number;
overscan?: number;
}
interface UseInfiniteScrollResult<T> {
items: T[];
loading: boolean;
hasMore: boolean;
loadMore: () => Promise<void>;
retry: () => void;
}
フロントエンドコード全文(結構長いので読みたい方のみで)
/**
* 音楽ストリーミングプラットフォーム フロントエンド
* React + TypeScript 高度な型システムを活用した実装例
*/
import React, {
useState,
useEffect,
useCallback,
useMemo,
useRef,
useContext,
createContext,
memo,
forwardRef,
useImperativeHandle,
Component,
ComponentProps,
PropsWithChildren,
ReactNode,
ReactElement,
CSSProperties
} from 'react';
// APIからの型をインポート（実際の実装では別ファイル）
import type {
UUID,
Track,
ArtistProfile,
Playlist,
UserProfile,
PlaybackState,
AudioQuality,
Genre,
UserLibrary,
RecommendationParams,
SearchQuery,
AudioFeatures,
PlaylistVisibility,
DeviceType,
UserSubscriptionType
} from './music-streaming-api';
// ========== 高度な型定義とジェネリクス ==========
interface BaseComponentProps {
className?: string;
style?: CSSProperties;
'data-testid'?: string;
}
type ComponentVariant = 'primary' | 'secondary' | 'tertiary' | 'danger' | 'ghost';
type ComponentSize = 'xs' | 'sm' | 'md' | 'lg' | 'xl';
type EventHandler<T = Event> = (event: T) => void | Promise<void>;
// 条件型を使った高度な型定義
type RequiredKeys<T> = {
[K in keyof T]-?: {} extends Pick<T, K> ? never : K;
}[keyof T];
type OptionalKeys<T> = {
[K in keyof T]-?: {} extends Pick<T, K> ? K : never;
}[keyof T];
// Mapped Types を使った型変換
type PartialBy<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;
type RequiredBy<T, K extends keyof T> = Omit<T, K> & Required<Pick<T, K>>;
// Template Literal Types
type ColorScheme = 'light' | 'dark' | 'auto';
type ThemeColor = `--theme-${string}`;
type BreakpointPrefix = 'xs' | 'sm' | 'md' | 'lg' | 'xl';
type ResponsiveClass = `${BreakpointPrefix}:${string}`;
// 複雑なユニオン型
type PlaybackAction =
| { type: 'PLAY'; payload: { trackId: UUID; position?: number } }
| { type: 'PAUSE' }
| { type: 'STOP' }
| { type: 'SEEK'; payload: { position: number } }
| { type: 'NEXT' }
| { type: 'PREVIOUS' }
| { type: 'SHUFFLE_TOGGLE'; payload: { enabled: boolean } }
| { type: 'REPEAT_TOGGLE'; payload: { mode: 'off' | 'all' | 'one' } }
| { type: 'VOLUME_CHANGE'; payload: { volume: number } };
// ========== Context API ==========
interface MusicPlayerContextValue {
currentTrack: Track | null;
playbackState: PlaybackState | null;
volume: number;
isShuffleEnabled: boolean;
repeatMode: 'off' | 'all' | 'one';
queue: Track[];
currentIndex: number;
// Actions
play: (track: Track, playlist?: Playlist) => Promise<void>;
pause: () => Promise<void>;
stop: () => Promise<void>;
seek: (position: number) => Promise<void>;
nextTrack: () => Promise<void>;
previousTrack: () => Promise<void>;
toggleShuffle: () => Promise<void>;
toggleRepeat: () => Promise<void>;
setVolume: (volume: number) => Promise<void>;
addToQueue: (tracks: Track[]) => Promise<void>;
removeFromQueue: (index: number) => Promise<void>;
}
const MusicPlayerContext = createContext<MusicPlayerContextValue | null>(null);
interface UserContextValue {
user: UserProfile | null;
library: UserLibrary | null;
subscription: UserSubscriptionType;
isLoggedIn: boolean;
// Actions
login: (email: string, password: string) => Promise<void>;
logout: () => Promise<void>;
likeTrack: (trackId: UUID) => Promise<void>;
unlikeTrack: (trackId: UUID) => Promise<void>;
followArtist: (artistId: UUID) => Promise<void>;
unfollowArtist: (artistId: UUID) => Promise<void>;
savePlaylist: (playlistId: UUID) => Promise<void>;
unsavePlaylist: (playlistId: UUID) => Promise<void>;
}
const UserContext = createContext<UserContextValue | null>(null);
interface ThemeContextValue {
theme: ColorScheme;
accentColor: string;
setTheme: (theme: ColorScheme) => void;
setAccentColor: (color: string) => void;
}
const ThemeContext = createContext<ThemeContextValue>({
theme: 'light',
accentColor: '#1db954',
setTheme: () => {},
setAccentColor: () => {}
});
// ========== Custom Hooks ==========
function useMusicPlayer(): MusicPlayerContextValue {
const context = useContext(MusicPlayerContext);
if (!context) {
throw new Error('useMusicPlayer must be used within a MusicPlayerProvider');
}
return context;
}
function useUser(): UserContextValue {
const context = useContext(UserContext);
if (!context) {
throw new Error('useUser must be used within a UserProvider');
}
return context;
}
function useTheme(): ThemeContextValue {
return useContext(ThemeContext);
}
// 高度なカスタムフック
function useAsyncState<T>(
initialState: T
): [T, (newState: T | Promise<T>) => Promise<void>, boolean] {
const [state, setState] = useState<T>(initialState);
const [isLoading, setIsLoading] = useState(false);
const setAsyncState = useCallback(async (newState: T | Promise<T>) => {
if (newState instanceof Promise) {
setIsLoading(true);
try {
const resolvedState = await newState;
setState(resolvedState);
} finally {
setIsLoading(false);
}
} else {
setState(newState);
}
}, []);
return [state, setAsyncState, isLoading];
}
function useDebounce<T>(value: T, delay: number): T {
const [debouncedValue, setDebouncedValue] = useState<T>(value);
useEffect(() => {
const handler = setTimeout(() => {
setDebouncedValue(value);
}, delay);
return () => {
clearTimeout(handler);
};
}, [value, delay]);
return debouncedValue;
}
function useVirtualList<T>(
items: T[],
itemHeight: number,
containerHeight: number
): {
visibleItems: Array<{ item: T; index: number; style: CSSProperties }>;
totalHeight: number;
scrollToIndex: (index: number) => void;
} {
const [scrollTop, setScrollTop] = useState(0);
const scrollElementRef = useRef<HTMLDivElement>(null);
const visibleItems = useMemo(() => {
const startIndex = Math.floor(scrollTop / itemHeight);
const endIndex = Math.min(
startIndex + Math.ceil(containerHeight / itemHeight) + 1,
items.length
);
return items.slice(startIndex, endIndex).map((item, index) => ({
item,
index: startIndex + index,
style: {
position: 'absolute' as const,
top: (startIndex + index) * itemHeight,
height: itemHeight,
width: '100%'
}
}));
}, [items, itemHeight, containerHeight, scrollTop]);
const totalHeight = items.length * itemHeight;
const scrollToIndex = useCallback((index: number) => {
if (scrollElementRef.current) {
scrollElementRef.current.scrollTop = index * itemHeight;
}
}, [itemHeight]);
const handleScroll = useCallback((event: React.UIEvent<HTMLDivElement>) => {
setScrollTop(event.currentTarget.scrollTop);
}, []);
useEffect(() => {
if (scrollElementRef.current) {
scrollElementRef.current.addEventListener('scroll', handleScroll as any);
return () => scrollElementRef.current?.removeEventListener('scroll', handleScroll as any);
}
}, [handleScroll]);
return { visibleItems, totalHeight, scrollToIndex };
}
function useInfiniteScroll<T>(
loadMore: () => Promise<T[]>,
hasMore: boolean,
threshold: number = 200
): {
items: T[];
isLoading: boolean;
error: Error | null;
containerRef: React.RefObject<HTMLDivElement | null>;
} {
const [items, setItems] = useState<T[]>([]);
const [isLoading, setIsLoading] = useState(false);
const [error, setError] = useState<Error | null>(null);
const containerRef = useRef<HTMLDivElement>(null);
const handleLoadMore = useCallback(async () => {
if (isLoading || !hasMore) return;
setIsLoading(true);
setError(null);
try {
const newItems = await loadMore();
setItems(prev => [...prev, ...newItems]);
} catch (err) {
setError(err as Error);
} finally {
setIsLoading(false);
}
}, [loadMore, hasMore, isLoading]);
useEffect(() => {
const container = containerRef.current;
if (!container) return;
const handleScroll = () => {
const { scrollTop, scrollHeight, clientHeight } = container;
if (scrollHeight - scrollTop - clientHeight < threshold) {
handleLoadMore();
}
};
container.addEventListener('scroll', handleScroll);
return () => container.removeEventListener('scroll', handleScroll);
}, [handleLoadMore, threshold]);
return { items, isLoading, error, containerRef };
}
// ========== 高度なコンポーネント群 ==========
interface ButtonProps extends BaseComponentProps {
variant?: ComponentVariant;
size?: ComponentSize;
disabled?: boolean;
loading?: boolean;
icon?: ReactElement;
iconPosition?: 'left' | 'right';
fullWidth?: boolean;
onClick?: EventHandler<React.MouseEvent<HTMLButtonElement>>;
children: ReactNode;
}
const Button = memo(forwardRef<HTMLButtonElement, ButtonProps>(({
variant = 'primary',
size = 'md',
disabled = false,
loading = false,
icon,
iconPosition = 'left',
fullWidth = false,
onClick,
children,
className = '',
...props
}, ref) => {
const buttonClass = useMemo(() => {
const classes = ['btn', `btn-${variant}`, `btn-${size}`];
if (fullWidth) classes.push('btn-full');
if (disabled) classes.push('btn-disabled');
if (loading) classes.push('btn-loading');
if (className) classes.push(className);
return classes.join(' ');
}, [variant, size, fullWidth, disabled, loading, className]);
const handleClick = useCallback(async (event: React.MouseEvent<HTMLButtonElement>) => {
if (disabled || loading) return;
await onClick?.(event);
}, [disabled, loading, onClick]);
return (
<button
ref={ref}
className={buttonClass}
disabled={disabled || loading}
onClick={handleClick}
{...props}
>
{loading && <div className="btn-spinner" />}
{icon && iconPosition === 'left' && (
<span className="btn-icon btn-icon-left">{icon}</span>
)}
<span className="btn-text">{children}</span>
{icon && iconPosition === 'right' && (
<span className="btn-icon btn-icon-right">{icon}</span>
)}
</button>
);
}));
Button.displayName = 'Button';
// 高度なジェネリックコンポーネント
interface ListProps<T> extends BaseComponentProps {
items: T[];
renderItem: (item: T, index: number) => ReactElement;
keyExtractor: (item: T, index: number) => string | number;
emptyComponent?: ReactElement;
headerComponent?: ReactElement;
footerComponent?: ReactElement;
separator?: ReactElement;
onEndReached?: () => void;
onEndReachedThreshold?: number;
virtualScrolling?: boolean;
itemHeight?: number;
maxHeight?: number;
}
function List<T>({
items,
renderItem,
keyExtractor,
emptyComponent,
headerComponent,
footerComponent,
separator,
onEndReached,
onEndReachedThreshold = 0.8,
virtualScrolling = false,
itemHeight = 50,
maxHeight = 400,
className = '',
...props
}: ListProps<T>): ReactElement {
const containerRef = useRef<HTMLDivElement>(null);
const { visibleItems, totalHeight } = useVirtualList(
items,
itemHeight,
maxHeight
);
const handleScroll = useCallback((event: React.UIEvent<HTMLDivElement>) => {
if (!onEndReached) return;
const { scrollTop, scrollHeight, clientHeight } = event.currentTarget;
const scrollPercentage = (scrollTop + clientHeight) / scrollHeight;
if (scrollPercentage >= onEndReachedThreshold) {
onEndReached();
}
}, [onEndReached, onEndReachedThreshold]);
if (items.length === 0 && emptyComponent) {
return emptyComponent;
}
return (
<div
ref={containerRef}
className={`list ${className}`}
onScroll={handleScroll}
style={{ maxHeight: virtualScrolling ? maxHeight : undefined }}
{...props}
>
{headerComponent}
{virtualScrolling ? (
<div style={{ height: totalHeight, position: 'relative' }}>
{visibleItems.map(({ item, index, style }) => (
<div key={keyExtractor(item, index)} style={style}>
{renderItem(item, index)}
{separator && index < items.length - 1 && separator}
</div>
))}
</div>
) : (
items.map((item, index) => (
<React.Fragment key={keyExtractor(item, index)}>
{renderItem(item, index)}
{separator && index < items.length - 1 && separator}
</React.Fragment>
))
)}
{footerComponent}
</div>
);
}
// 複雑なフォームコンポーネント
interface FormFieldProps<T> extends BaseComponentProps {
name: keyof T;
label?: string;
required?: boolean;
error?: string;
helpText?: string;
disabled?: boolean;
children: ReactElement;
}
function FormField<T>({
name,
label,
required = false,
error,
helpText,
disabled = false,
children,
className = '',
...props
}: FormFieldProps<T>): ReactElement {
const fieldId = useMemo(() => `field-${String(name)}`, [name]);
return (
<div
className={`form-field ${error ? 'form-field-error' : ''} ${className}`}
{...props}
>
{label && (
<label htmlFor={fieldId} className="form-label">
{label}
{required && <span className="form-required">*</span>}
</label>
)}
<div className="form-input-wrapper">
{React.cloneElement(children as React.ReactElement<any>, {
id: fieldId,
disabled,
'aria-invalid': !!error,
'aria-describedby': error ? `${fieldId}-error` : helpText ? `${fieldId}-help` : undefined
})}
</div>
{error && (
<div id={`${fieldId}-error`} className="form-error" role="alert">
{error}
</div>
)}
{helpText && !error && (
<div id={`${fieldId}-help`} className="form-help">
{helpText}
</div>
)}
</div>
);
}
// ========== 音楽固有のコンポーネント ==========
interface TrackRowProps extends BaseComponentProps {
track: Track;
index?: number;
isPlaying?: boolean;
isLiked?: boolean;
showArtist?: boolean;
showAlbum?: boolean;
showDuration?: boolean;
showActions?: boolean;
onPlay?: (track: Track) => void;
onLike?: (track: Track, liked: boolean) => void;
onAddToPlaylist?: (track: Track) => void;
onShare?: (track: Track) => void;
}
const TrackRow = memo<TrackRowProps>(({
track,
index,
isPlaying = false,
isLiked = false,
showArtist = true,
showAlbum = true,
showDuration = true,
showActions = true,
onPlay,
onLike,
onAddToPlaylist,
onShare,
className = '',
...props
}) => {
const handlePlay = useCallback(() => {
onPlay?.(track);
}, [onPlay, track]);
const handleLike = useCallback(() => {
onLike?.(track, !isLiked);
}, [onLike, track, isLiked]);
const handleAddToPlaylist = useCallback(() => {
onAddToPlaylist?.(track);
}, [onAddToPlaylist, track]);
const handleShare = useCallback(() => {
onShare?.(track);
}, [onShare, track]);
const formatDuration = useCallback((duration: number) => {
const minutes = Math.floor(duration / 60000);
const seconds = Math.floor((duration % 60000) / 1000);
return `${minutes}:${seconds.toString().padStart(2, '0')}`;
}, []);
return (
<div
className={`track-row ${isPlaying ? 'track-row-playing' : ''} ${className}`}
{...props}
>
{typeof index === 'number' && (
<div className="track-row-index">
{isPlaying ? (
<div className="track-row-equalizer">
<span></span>
<span></span>
<span></span>
</div>
) : (
<span>{index + 1}</span>
)}
</div>
)}
<button className="track-row-play" onClick={handlePlay} aria-label="Play track">
<div className="track-row-cover">
{/* Album cover image would go here */}
<div className="track-row-play-overlay">
<svg viewBox="0 0 24 24" className="play-icon">
<path d="M8 5v14l11-7z" />
</svg>
</div>
</div>
<div className="track-row-info">
<div className="track-row-title">{track.title}</div>
{showArtist && (
<div className="track-row-artist">
{/* Artist names would be rendered here */}
</div>
)}
</div>
</button>
{showAlbum && (
<div className="track-row-album">
{/* Album title would go here */}
</div>
)}
{showActions && (
<div className="track-row-actions">
<button
className={`track-row-like ${isLiked ? 'liked' : ''}`}
onClick={handleLike}
aria-label={isLiked ? 'Unlike track' : 'Like track'}
>
<svg viewBox="0 0 24 24">
<path d="M12 21.35l-1.45-1.32C5.4 15.36 2 12.28 2 8.5 2 5.42 4.42 3 7.5 3c1.74 0 3.41.81 4.5 2.09C13.09 3.81 14.76 3 16.5 3 19.58 3 22 5.42 22 8.5c0 3.78-3.4 6.86-8.55 11.54L12 21.35z" />
</svg>
</button>
<button
className="track-row-add"
onClick={handleAddToPlaylist}
aria-label="Add to playlist"
>
<svg viewBox="0 0 24 24">
<path d="M19 13h-6v6h-2v-6H5v-2h6V5h2v6h6v2z" />
</svg>
</button>
<button
className="track-row-share"
onClick={handleShare}
aria-label="Share track"
>
<svg viewBox="0 0 24 24">
<path d="M18 16.08c-.76 0-1.44.3-1.96.77L8.91 12.7c.05-.23.09-.46.09-.7s-.04-.47-.09-.7l7.05-4.11c.54.5 1.25.81 2.04.81 1.66 0 3-1.34 3-3s-1.34-3-3-3-3 1.34-3 3c0 .24.04.47.09.7L8.04 9.81C7.5 9.31 6.79 9 6 9c-1.66 0-3 1.34-3 3s1.34 3 3 3c.79 0 1.50-.31 2.04-.81l7.12 4.16c-.05.21-.08.43-.08.65 0 1.61 1.31 2.92 2.92 2.92s2.92-1.31 2.92-2.92-1.31-2.92-2.92-2.92z" />
</svg>
</button>
</div>
)}
{showDuration && (
<div className="track-row-duration">
{formatDuration(track.duration)}
</div>
)}
</div>
);
});
TrackRow.displayName = 'TrackRow';
interface PlaylistCardProps extends BaseComponentProps {
playlist: Playlist;
size?: 'sm' | 'md' | 'lg';
showDescription?: boolean;
showOwner?: boolean;
showTrackCount?: boolean;
onPlay?: (playlist: Playlist) => void;
onFollow?: (playlist: Playlist, following: boolean) => void;
onClick?: (playlist: Playlist) => void;
}
const PlaylistCard = memo<PlaylistCardProps>(({
playlist,
size = 'md',
showDescription = true,
showOwner = true,
showTrackCount = true,
onPlay,
onFollow,
onClick,
className = '',
...props
}) => {
const [isFollowing, setIsFollowing] = useState(false);
const handlePlay = useCallback((event: React.MouseEvent) => {
event.stopPropagation();
onPlay?.(playlist);
}, [onPlay, playlist]);
const handleFollow = useCallback((event: React.MouseEvent) => {
event.stopPropagation();
const newFollowing = !isFollowing;
setIsFollowing(newFollowing);
onFollow?.(playlist, newFollowing);
}, [onFollow, playlist, isFollowing]);
const handleClick = useCallback(() => {
onClick?.(playlist);
}, [onClick, playlist]);
return (
<div
className={`playlist-card playlist-card-${size} ${className}`}
onClick={handleClick}
role="button"
tabIndex={0}
{...props}
>
<div className="playlist-card-cover">
{playlist.imageUrl ? (
<img src={playlist.imageUrl} alt={playlist.name} />
) : (
<div className="playlist-card-cover-placeholder">
<svg viewBox="0 0 24 24">
<path d="M12 3v10.55c-.59-.34-1.27-.55-2-.55-2.21 0-4 1.79-4 4s1.79 4 4 4 4-1.79 4-4V7h4V3h-6z" />
</svg>
</div>
)}
<button
className="playlist-card-play"
onClick={handlePlay}
aria-label="Play playlist"
>
<svg viewBox="0 0 24 24">
<path d="M8 5v14l11-7z" />
</svg>
</button>
</div>
<div className="playlist-card-info">
<h3 className="playlist-card-title">{playlist.name}</h3>
{showDescription && playlist.description && (
<p className="playlist-card-description">{playlist.description}</p>
)}
<div className="playlist-card-meta">
{showOwner && (
<span className="playlist-card-owner">
By {/* Owner name would go here */}
</span>
)}
{showTrackCount && (
<span className="playlist-card-track-count">
{playlist.items.length} tracks
</span>
)}
</div>
</div>
<button
className={`playlist-card-follow ${isFollowing ? 'following' : ''}`}
onClick={handleFollow}
aria-label={isFollowing ? 'Unfollow playlist' : 'Follow playlist'}
>
{isFollowing ? 'Following' : 'Follow'}
</button>
</div>
);
});
PlaylistCard.displayName = 'PlaylistCard';
// 高度な音楽プレイヤーコンポーネント
interface MusicPlayerRef {
play: () => void;
pause: () => void;
seek: (position: number) => void;
setVolume: (volume: number) => void;
}
interface MusicPlayerProps extends BaseComponentProps {
compact?: boolean;
showQueue?: boolean;
showLyrics?: boolean;
}
const MusicPlayer = memo(forwardRef<MusicPlayerRef, MusicPlayerProps>(({
compact = false,
showQueue = false,
showLyrics = false,
className = '',
...props
}, ref) => {
const {
currentTrack,
playbackState,
volume,
isShuffleEnabled,
repeatMode,
play,
pause,
stop,
seek,
nextTrack,
previousTrack,
toggleShuffle,
toggleRepeat,
setVolume
} = useMusicPlayer();
const [position, setPosition] = useState(0);
const [isDragging, setIsDragging] = useState(false);
const progressRef = useRef<HTMLDivElement>(null);
useImperativeHandle(ref, () => ({
play: () => currentTrack && play(currentTrack),
pause,
seek,
setVolume
}), [currentTrack, play, pause, seek, setVolume]);
const isPlaying = playbackState?.isPlaying ?? false;
const formatTime = useCallback((ms: number) => {
const seconds = Math.floor(ms / 1000);
const minutes = Math.floor(seconds / 60);
const remainingSeconds = seconds % 60;
return `${minutes}:${remainingSeconds.toString().padStart(2, '0')}`;
}, []);
const handleProgressClick = useCallback((event: React.MouseEvent<HTMLDivElement>) => {
if (!currentTrack || !progressRef.current) return;
const rect = progressRef.current.getBoundingClientRect();
const clickPosition = (event.clientX - rect.left) / rect.width;
const newPosition = clickPosition * currentTrack.duration;
seek(newPosition);
setPosition(newPosition);
}, [currentTrack, seek]);
const handleProgressDrag = useCallback((event: React.MouseEvent<HTMLDivElement>) => {
if (!isDragging || !currentTrack || !progressRef.current) return;
const rect = progressRef.current.getBoundingClientRect();
const dragPosition = Math.max(0, Math.min(1, (event.clientX - rect.left) / rect.width));
const newPosition = dragPosition * currentTrack.duration;
setPosition(newPosition);
}, [isDragging, currentTrack]);
const handleProgressMouseDown = useCallback(() => {
setIsDragging(true);
}, []);
const handleProgressMouseUp = useCallback(() => {
if (isDragging) {
seek(position);
setIsDragging(false);
}
}, [isDragging, position, seek]);
useEffect(() => {
if (!isDragging && playbackState) {
setPosition(playbackState.progressMs);
}
}, [playbackState, isDragging]);
if (!currentTrack) {
return null;
}
return (
<div className={`music-player ${compact ? 'compact' : ''} ${className}`} {...props}>
<div className="music-player-track-info">
<div className="music-player-cover">
{/* Track cover image */}
</div>
<div className="music-player-details">
<div className="music-player-title">{currentTrack.title}</div>
<div className="music-player-artist">
{/* Artist name */}
</div>
</div>
</div>
<div className="music-player-controls">
<div className="music-player-main-controls">
<button
className={`music-player-shuffle ${isShuffleEnabled ? 'active' : ''}`}
onClick={toggleShuffle}
aria-label="Toggle shuffle"
>
<svg viewBox="0 0 24 24">
<path d="M10.59 9.17L5.41 4 4 5.41l5.17 5.17 1.42-1.41zM14.5 4l2.04 2.04L4 18.59 5.41 20 17.96 7.46 20 9.5V4h-5.5zm.33 9.41l-1.41 1.41 3.13 3.13L14.5 20H20v-5.5l-2.04 2.04-3.13-3.13z" />
</svg>
</button>
<button
className="music-player-previous"
onClick={previousTrack}
aria-label="Previous track"
>
<svg viewBox="0 0 24 24">
<path d="M6 6h2v12H6zm3.5 6l8.5 6V6z" />
</svg>
</button>
<button
className={`music-player-play ${isPlaying ? 'playing' : ''}`}
onClick={isPlaying ? pause : () => currentTrack && play(currentTrack)}
aria-label={isPlaying ? 'Pause' : 'Play'}
>
{isPlaying ? (
<svg viewBox="0 0 24 24">
<path d="M6 19h4V5H6v14zm8-14v14h4V5h-4z" />
</svg>
) : (
<svg viewBox="0 0 24 24">
<path d="M8 5v14l11-7z" />
</svg>
)}
</button>
<button
className="music-player-next"
onClick={nextTrack}
aria-label="Next track"
>
<svg viewBox="0 0 24 24">
<path d="M6 18l8.5-6L6 6v12zM16 6v12h2V6h-2z" />
</svg>
</button>
<button
className={`music-player-repeat ${repeatMode !== 'off' ? 'active' : ''}`}
onClick={toggleRepeat}
aria-label="Toggle repeat"
>
<svg viewBox="0 0 24 24">
<path d="M7 7h10v3l4-4-4-4v3H5v6h2V7zm10 10H7v-3l-4 4 4 4v-3h12v-6h-2v4z" />
</svg>
{repeatMode === 'one' && <span className="repeat-one-indicator">1</span>}
</button>
</div>
<div className="music-player-progress">
<span className="music-player-time current">
{formatTime(position)}
</span>
<div
ref={progressRef}
className="music-player-progress-bar"
onClick={handleProgressClick}
onMouseMove={handleProgressDrag}
onMouseDown={handleProgressMouseDown}
onMouseUp={handleProgressMouseUp}
>
<div
className="music-player-progress-filled"
style={{ width: `${(position / currentTrack.duration) * 100}%` }}
/>
<div
className="music-player-progress-handle"
style={{ left: `${(position / currentTrack.duration) * 100}%` }}
/>
</div>
<span className="music-player-time total">
{formatTime(currentTrack.duration)}
</span>
</div>
</div>
<div className="music-player-volume">
<button aria-label="Mute">
<svg viewBox="0 0 24 24">
<path d="M3 9v6h4l5 5V4L7 9H3zm13.5 3c0-1.77-1.02-3.29-2.5-4.03v8.05c1.48-.73 2.5-2.25 2.5-4.02zM14 3.23v2.06c2.89.86 5 3.54 5 6.71s-2.11 5.85-5 6.71v2.06c4.01-.91 7-4.49 7-8.77s-2.99-7.86-7-8.77z" />
</svg>
</button>
<div className="music-player-volume-slider">
<input
type="range"
min="0"
max="100"
value={volume}
onChange={(e) => setVolume(Number(e.target.value))}
aria-label="Volume"
/>
</div>
</div>
</div>
);
}));
MusicPlayer.displayName = 'MusicPlayer';
// ========== メインアプリケーションコンポーネント ==========
interface SearchPageProps {
query: string;
onQueryChange: (query: string) => void;
}
const SearchPage = memo<SearchPageProps>(({ query, onQueryChange }) => {
const [searchResults, setSearchResults] = useAsyncState<{
tracks: Track[];
artists: ArtistProfile[];
playlists: Playlist[];
}>({ tracks: [], artists: [], playlists: [] });
const [isLoading, setIsLoading] = useState(false);
const debouncedQuery = useDebounce(query, 300);
const { play } = useMusicPlayer();
useEffect(() => {
if (debouncedQuery.trim()) {
setIsLoading(true);
// Search API call would go here
setTimeout(() => {
setSearchResults({
tracks: [],
artists: [],
playlists: []
});
setIsLoading(false);
}, 500);
}
}, [debouncedQuery]);
const handleTrackPlay = useCallback((track: Track) => {
play(track);
}, [play]);
return (
<div className="search-page">
<div className="search-header">
<input
type="search"
value={query}
onChange={(e) => onQueryChange(e.target.value)}
placeholder="Search for songs, artists, or playlists"
className="search-input"
/>
</div>
{isLoading && (
<div className="search-loading">
<div className="spinner" />
<span>Searching...</span>
</div>
)}
{!isLoading && debouncedQuery && (
<div className="search-results">
{searchResults.tracks.length > 0 && (
<section className="search-section">
<h2>Songs</h2>
<List
items={searchResults.tracks}
renderItem={(track, index) => (
<TrackRow
key={track.id}
track={track}
index={index}
onPlay={handleTrackPlay}
/>
)}
keyExtractor={(track) => track.id}
virtualScrolling
itemHeight={60}
/>
</section>
)}
{searchResults.artists.length > 0 && (
<section className="search-section">
<h2>Artists</h2>
{/* Artist results */}
</section>
)}
{searchResults.playlists.length > 0 && (
<section className="search-section">
<h2>Playlists</h2>
{searchResults.playlists.map((playlist) => (
<PlaylistCard key={playlist.id} playlist={playlist} />
))}
</section>
)}
</div>
)}
</div>
);
});
SearchPage.displayName = 'SearchPage';
// クラスコンポーネントの例
interface LibraryPageState {
activeTab: 'playlists' | 'artists' | 'albums';
playlists: Playlist[];
loading: boolean;
error: string | null;
}
class LibraryPage extends Component<{}, LibraryPageState> {
state: LibraryPageState = {
activeTab: 'playlists',
playlists: [],
loading: false,
error: null
};
async componentDidMount() {
await this.loadUserPlaylists();
}
private loadUserPlaylists = async () => {
this.setState({ loading: true, error: null });
try {
// API call to load user playlists
const playlists: Playlist[] = [];
this.setState({ playlists });
} catch (error) {
this.setState({ error: (error as Error).message });
} finally {
this.setState({ loading: false });
}
};
private handleTabChange = (tab: LibraryPageState['activeTab']) => {
this.setState({ activeTab: tab });
};
render() {
const { activeTab, playlists, loading, error } = this.state;
return (
<div className="library-page">
<div className="library-tabs">
<button
className={activeTab === 'playlists' ? 'active' : ''}
onClick={() => this.handleTabChange('playlists')}
>
Playlists
</button>
<button
className={activeTab === 'artists' ? 'active' : ''}
onClick={() => this.handleTabChange('artists')}
>
Artists
</button>
<button
className={activeTab === 'albums' ? 'active' : ''}
onClick={() => this.handleTabChange('albums')}
>
Albums
</button>
</div>
<div className="library-content">
{loading && <div className="loading">Loading...</div>}
{error && <div className="error">{error}</div>}
{activeTab === 'playlists' && !loading && (
<div className="library-playlists">
{playlists.map((playlist) => (
<PlaylistCard key={playlist.id} playlist={playlist} />
))}
</div>
)}
</div>
</div>
);
}
}
// メインアプリケーション
const MusicStreamingApp: React.FC = () => {
const [currentPage, setCurrentPage] = useState<'home' | 'search' | 'library'>('home');
const [searchQuery, setSearchQuery] = useState('');
return (
<div className="music-app">
<nav className="music-app-nav">
<button
className={currentPage === 'home' ? 'active' : ''}
onClick={() => setCurrentPage('home')}
>
Home
</button>
<button
className={currentPage === 'search' ? 'active' : ''}
onClick={() => setCurrentPage('search')}
>
Search
</button>
<button
className={currentPage === 'library' ? 'active' : ''}
onClick={() => setCurrentPage('library')}
>
Library
</button>
</nav>
<main className="music-app-content">
{currentPage === 'search' && (
<SearchPage query={searchQuery} onQueryChange={setSearchQuery} />
)}
{currentPage === 'library' && <LibraryPage />}
{currentPage === 'home' && (
<div className="home-page">
<h1>Welcome to Music Streaming</h1>
<p>Discover your favorite music</p>
</div>
)}
</main>
<MusicPlayer />
</div>
);
};
export default MusicStreamingApp;
全体速度比較結果
測定方法
両コンパイラともに --extendedDiagnostics オプションを使用して詳細な統計情報を取得します。
# 従来のTypeScriptコンパイラ
npx tsc -p . --extendedDiagnostics
# 新しいtsgoコンパイラ
npx tsgo -p . --extendedDiagnostics
計測結果
| 計測項目 | tsc (従来) | tsgo (新) | tsgoによる改善 |
|---|---|---|---|
| 合計処理時間 | 0.37s | 0.095s | 約3.9倍 高速化 |
| 型チェック時間 | 0.18s | 0.029s | 約6.2倍 高速化 |
| メモリ使用量 | 140,538K | 47,098K | 約3.0倍 効率化 |
以下、詳細な統計比較を表示します。
tsc (従来コンパイラ)
Files: 89
Lines of Library: 53140
Lines of Definitions: 25898
Lines of TypeScript: 2306
Lines of JavaScript: 0
Lines of JSON: 0
Lines of Other: 0
Identifiers: 65561
Symbols: 59968
Types: 10136
Instantiations: 11959
Memory used: 140538K
Assignability cache size: 2407
Identity cache size: 315
Subtype cache size: 154
Strict subtype cache size: 39
I/O Read time: 0.01s
Parse time: 0.09s
ResolveModule time: 0.00s
ResolveTypeReference time: 0.00s
ResolveLibrary time: 0.00s
Program time: 0.11s
Bind time: 0.05s
Check time: 0.18s
transformTime time: 0.01s
commentTime time: 0.00s
I/O Write time: 0.00s
printTime time: 0.03s
Emit time: 0.03s
Total time: 0.37s
tsgo (新コンパイラ)
Files: 87
Lines: 71363
Identifiers: 65015
Symbols: 60761
Types: 12367
Instantiations: 12356
Memory used: 47098K
Memory allocs: 218684
Config time: 0.000s
Parse time: 0.012s
Bind time: 0.003s
Check time: 0.029s
Emit time: 0.050s
Total time: 0.095s
TypeScript7.0(Corsa)とは？
現在のMicrosoftのTypeScript開発チームは、2つの実装系統を並行開発しています：
Strada（ストラーダ）- 既存のTypeScript系列
元々のTypeScriptのコードネーム。
- 実装: JavaScript/Node.js ベース（従来のtsc）
- 対象: 現行のTypeScript 5.xと、TypeScript 6.xまでがこちらに連なる
- 特徴: 既存ツールチェーンとの完全互換性
- 意味: イタリア語で"Road"（道路）
Corsa（コルサ）- 新しいGo言語による実装
TypeScript 7.0としていずれリリースされる、開発中の実装
- 実装: Go言語ネイティブバイナリ（tsgo）
- 目標: 最大10倍の高速化、メモリ使用量半減
- 意味: イタリア語で"race course"（レースコース）
命名の背景と意図
Strada（道路） vs Corsa（レースコース） の対比
- Strada: 安定した既存の道筋、継続性を重視
- Corsa: レースコースのように速さを追求、性能特化
この命名からも分かるように、Corsaは「速いんだ」ということで名付けられており、性能向上への強いコミットメントを表現しているそうです。
¹ Ask me Anything, RyanC, TypeScript Community Discord
² Microsoft Dev Blogs: "A 10x Faster TypeScript" - Anders Hejlsberg, March 11th, 2025>
実際の性能比較（Microsoft公式データ）
| プロジェクト | コード行数 | Strada（現在） | Corsa（Go） | 高速化 |
|---|---|---|---|---|
| VS Code | 1,505,000行 | 77.8秒 | 7.5秒 | 10.4倍 |
| Playwright | 356,000行 | 11.1秒 | 1.1秒 | 10.1倍 |
| TypeORM | 270,000行 | 17.5秒 | 1.3秒 | 13.5倍 |
| date-fns | 104,000行 | 6.5秒 | 0.7秒 | 9.5倍 |
| tRPC | 18,000行 | 5.5秒 | 0.6秒 | 9.1倍 |
| RxJS | 2,100行 | 1.1秒 | 0.1秒 | 11.0倍 |
エディタ性能向上³:
- プロジェクトロード時間: 9.6秒 → 1.2秒（8倍改善）
- メモリ使用量: 約50%削減
Microsoft Dev Blogs: "A 10x Faster TypeScript" - How Much Faster? section - Anders Hejlsberg, March 11th, 2025
TypeScript → Go完全移植の実証
(目標)99.99%の互換性目標
- エラー完全一致: 「同じコードベースに対して全く同じエラーセットを出したい」
- テスト網羅性: 「2万件の適合テストをクラッシュせずに実行できる」
- 機能同等性: 既存TypeScriptコンパイラとの出力完全一致
核心関数の1対1置き換え
TypeScriptのchecker.tsからGo言語のchecker.goへの移植は、機能レベルで完全な1対1対応を実現しています。その代表例として、型チェッカーの中核を担うgetTypeOfSymbol関数の比較をご覧ください
Strada実装（checker.ts）
function getTypeOfSymbol(symbol: Symbol): Type {
const checkFlags = getCheckFlags(symbol);
if (checkFlags & CheckFlags.DeferredType) {
return getTypeOfSymbolWithDeferredType(symbol);
}
if (checkFlags & CheckFlags.Instantiated) {
return getTypeOfInstantiatedSymbol(symbol);
}
if (checkFlags & CheckFlags.Mapped) {
return getTypeOfMappedSymbol(symbol as MappedSymbol);
}
if (checkFlags & CheckFlags.ReverseMapped) {
return getTypeOfReverseMappedSymbol(symbol as ReverseMappedSymbol);
}
if (symbol.flags & (SymbolFlags.Variable | SymbolFlags.Property)) {
return getTypeOfVariableOrParameterOrProperty(symbol);
}
if (symbol.flags & (SymbolFlags.Function | SymbolFlags.Method | SymbolFlags.Class | SymbolFlags.Enum | SymbolFlags.ValueModule)) {
return getTypeOfFuncClassEnumModule(symbol);
}
if (symbol.flags & SymbolFlags.EnumMember) {
return getTypeOfEnumMember(symbol);
}
if (symbol.flags & SymbolFlags.Accessor) {
return getTypeOfAccessors(symbol);
}
if (symbol.flags & SymbolFlags.Alias) {
return getTypeOfAlias(symbol);
}
return errorType;
}
Corsa実装（checker.go）:
func (c *Checker) getTypeOfSymbol(symbol *ast.Symbol) *Type {
if symbol.CheckFlags&ast.CheckFlagsDeferredType != 0 {
return c.getTypeOfSymbolWithDeferredType(symbol)
}
if symbol.CheckFlags&ast.CheckFlagsInstantiated != 0 {
return c.getTypeOfInstantiatedSymbol(symbol)
}
if symbol.CheckFlags&ast.CheckFlagsMapped != 0 {
return c.getTypeOfMappedSymbol(symbol)
}
if symbol.CheckFlags&ast.CheckFlagsReverseMapped != 0 {
return c.getTypeOfReverseMappedSymbol(symbol)
}
if symbol.Flags&(ast.SymbolFlagsVariable|ast.SymbolFlagsProperty) != 0 {
return c.getTypeOfVariableOrParameterOrProperty(symbol)
}
if symbol.Flags&(ast.SymbolFlagsFunction|ast.SymbolFlagsMethod|ast.SymbolFlagsClass|ast.SymbolFlagsEnum|ast.SymbolFlagsValueModule) != 0 {
return c.getTypeOfFuncClassEnumModule(symbol)
}
if symbol.Flags&ast.SymbolFlagsEnumMember != 0 {
return c.getTypeOfEnumMember(symbol)
}
if symbol.Flags&ast.SymbolFlagsAccessor != 0 {
return c.getTypeOfAccessors(symbol)
}
if symbol.Flags&ast.SymbolFlagsAlias != 0 {
return c.getTypeOfAlias(symbol)
}
return c.errorType
}
この関数からわかるように移植の完全性を非常に大事にしていそうですね。
完全対応項目:
- ✅ 条件分岐の順序（9つの条件すべて同一順序）
- ✅ フラグ操作（ビット演算パターン完全一致）
- ✅ 関数呼び出し（各分岐で対応する関数を呼び出し）
- ✅ エラーハンドリング（
errorType→c.errorType）
言語固有の最適化:
- TypeScript: 動的型チェック、as キャスト
- Go: 静的型安全性、構造体レシーバー、ポインタ効率
この1対1対応により、TypeScriptの豊富な機能をすべて保持しながら、Go言語のネイティブ性能とメモリ効率を獲得しています。
TypeScript 7.0 (Corsa)の10倍高速化アーキテクチャ
1. ネイティブ化による高速化（公式目標 3.0〜3.5倍効果）
TypeScript Checkerの実装比較
Strada（checker.ts） - JavaScript実装:
// V8エンジン + Node.js実行環境での制約
function createTypeChecker(host: TypeCheckerHost, produceDiagnostics: boolean): TypeChecker {
let nextSymbolId = 1; // 動的な型、JITコンパイル対象
// ヒープ上のオブジェクト作成（GCコスト大）
const stringLiteralTypes = new Map<string, StringLiteralType>();
const typeCache = new Map<string, Type>(); // メモリ断片化
function checkType(node: ts.Node) {
// JITコンパイル: 実行時最適化、Deoptimization発生
if (typeof node.kind === 'number') { /* ... */ }
}
return checker;
}
Corsa（checker.go） - Go実装:
// ネイティブバイナリ直接実行、事前最適化済み
var nextCheckerID atomic.Uint32 // 並行安全、ネイティブ整数型
type Checker struct {
id uint32
// 連続メモリ配置、キャッシュフレンドリー
stringLiteralTypes map[string]*Type // 効率的ハッシュテーブル
cachedTypes map[CachedTypeKey]*Type // 型安全なキー
symbolCache [16]map[string]*Symbol // 固定サイズ配列
}
func (c *Checker) checkType(node *ast.Node) {
// コンパイル時型安全性、予測可能な実行パス
switch node.Kind { /* ネイティブswitch文 */ }
}
func NewChecker(program Program) *Checker {
c := &Checker{}
c.id = nextCheckerID.Add(1) // atomic操作、ロック不要
return c
}
速度改善効果
1. 起動時間の劇的短縮
# Strada (tsc): Node.js起動オーバーヘッド
$ time node --version # Node.js自体の起動で50-100ms
$ time npx tsc --version # TSコンパイラロードでさらに50-150ms
# 合計: 100-200ms
# Corsa (tsgo): ネイティブバイナリ直接実行
$ time ./tsgo --version # バイナリ直接実行: 0-5ms
Version 7.0.0-dev.20250822.1
real 0m0.003s # ← 劇的な短縮
2. 文字列処理の効率化
Strada: UTF-16文字列（メモリ大量消費）
const sourceCode = `import { Component } from 'react';
export function Button() { return <div>Click</div>; }`;
// UTF-16: 各文字2バイト = 96バイト
const identifier = sourceCode.substring(9, 18); // 新しい文字列オブジェクト生成
Corsa: UTF-8文字列（メモリ効率）
sourceCode := `import { Component } from 'react';
export function Button() { return <div>Click</div>; }`
// UTF-8: ASCII文字1バイト = 48バイト（半分）
identifier := sourceCode[9:18] // ゼロアロケーション、元文字列への参照のみ
3. メモリレイアウトとGC効率
Strada: ヒープ断片化、GCコスト大
const typeCache = new Map(); // ヒープに散在
const symbolCache = new Map(); // 各エントリが個別オブジェクト
const nodeCache = new Map(); // GC対象が多数
// 結果: ガベージコレクションが頻発、処理停止時間が長い
Corsa: 連続メモリ配置、GC最適化
type Checker struct {
// 構造体として連続メモリに配置
typeCache map[string]*Type // 効率的ハッシュテーブル
symbolCache [16]map[string]*Symbol // 固定配列、キャッシュフレンドリー
nodeCache map[NodeKey]*Node // ポインタベース、参照効率
}
// 結果: メモリ局所性向上、GCコスト激減（2倍速効果）
2. 並列処理による高速化（公式目標 3.0〜3.5倍効果）
実際の並列処理実装（workgroup.go）
Strada: シングルスレッド制約
async function compileFiles(files: string[]) {
for (const file of files) {
await parseFile(file); // 順次処理、1コアのみ使用
}
}
Corsa: 実際のworkgroup.go実装
package core
import (
"context"
"sync"
"sync/atomic"
"golang.org/x/sync/errgroup"
)
// WorkGroup インターフェース - 並列処理の抽象化
type WorkGroup interface {
// Queue queues a function to run. It may be invoked immediately, or deferred until RunAndWait.
// It is not safe to call Queue after RunAndWait has returned.
Queue(fn func())
// RunAndWait runs all queued functions, blocking until they have all completed.
RunAndWait()
}
// ファクトリー関数 - 並列処理モードの選択
func NewWorkGroup(singleThreaded bool) WorkGroup {
if singleThreaded {
return &singleThreadedWorkGroup{}
}
return ¶llelWorkGroup{}
}
// 並列処理実装
type parallelWorkGroup struct {
done atomic.Bool // 完了フラグ（atomic操作）
wg sync.WaitGroup // 全goroutineの完了待機
}
func (w *parallelWorkGroup) Queue(fn func()) {
if w.done.Load() {
panic("Queue called after RunAndWait returned")
}
w.wg.Add(1)
go func() { // ← 実際のgoroutine起動
defer w.wg.Done()
fn() // タスク実行
}()
}
func (w *parallelWorkGroup) RunAndWait() {
defer w.done.Store(true)
w.wg.Wait() // 全goroutineの完了を待機
}
// セマフォ付き並行制御 - 同時実行数を制限
type ThrottleGroup struct {
semaphore chan struct{} // セマフォチャンネル
group *errgroup.Group
}
func NewThrottleGroup(ctx context.Context, semaphore chan struct{}) *ThrottleGroup {
g, _ := errgroup.WithContext(ctx)
return &ThrottleGroup{
semaphore: semaphore,
group: g,
}
}
func (tg *ThrottleGroup) Go(fn func() error) {
tg.group.Go(func() error {
// Acquire semaphore slot - this will block until a slot is available
tg.semaphore <- struct{}{}
defer func() {
// Release semaphore slot when done
<-tg.semaphore
}()
return fn()
})
}
速度改善効果
1. CPU利用率の最大化
# Strada: シングルスレッド実行時のCPU利用率
$ top -pid $(pgrep node)
# PID %CPU TIME COMMAND
# 1234 12.5 0:05.23 node tsc.js # 8コア中1コアのみ使用
# Corsa: 並列実行時のCPU利用率
$ top -pid $(pgrep tsgo)
# PID %CPU TIME COMMAND
# 5678 95.2 0:01.45 tsgo # 8コア中ほぼ全コア使用
2. 並列型チェックの実装（実際のchecker.go）
Strada: 順次処理（シングルスレッド制約）
// TypeScript版: 順次処理のみ
async function checkAllFiles(files: string[]) {
for (const file of files) {
await checkFile(file); // 1つずつ順番に処理
}
}
Corsa: 実際の並行安全な型チェック実装
// checker.go - 並行安全なIDとインスタンス管理
var nextCheckerID atomic.Uint32 // 並行安全なID生成
type Checker struct {
id uint32 // 一意のチェッカーID
ctx context.Context // 並行処理制御
emitResolverOnce sync.Once // 遅延初期化（並行安全）
ambientModulesOnce sync.Once // 一度だけ実行保証
// 型チェック統計（並行安全）
TypeCount uint32
SymbolCount uint32
TotalInstantiationCount uint32
instantiationCount uint32
}
// Context対応の型チェック関数
func (c *Checker) CheckSourceFile(ctx context.Context, sourceFile *ast.SourceFile) {
if SkipTypeChecking(sourceFile, c.compilerOptions, c.program, false) {
return
}
c.checkSourceFile(ctx, sourceFile)
}
func (c *Checker) checkSourceFile(ctx context.Context, sourceFile *ast.SourceFile) {
c.checkNotCanceled() // キャンセレーション対応
links := c.sourceFileLinks.Get(sourceFile)
// 実際の型チェック処理...
}
// 並行安全なチェッカー生成
func NewChecker(program Program) *Checker {
c := &Checker{}
c.id = nextCheckerID.Add(1) // atomic操作による安全なID割り当て
c.ctx = context.Background() // 並行処理用コンテキスト
return c
}
3. ロックフリー同期の実現（実際のchecker.go）
Strada: 従来のロックベース同期（コスト大）
// TypeScript版: 単一インスタンスでロック不要だが拡張性なし
function createTypeChecker() {
let typeCache = new Map(); // シングルスレッド前提
function getType(key) {
return typeCache.get(key); // ロック不要だが並列処理不可
}
}
Corsa: sync.Onceによるロックフリー遅延初期化
// checker.go - 実際のロックフリー実装
type Checker struct {
emitResolver *emitResolver
emitResolverOnce sync.Once // 一度だけ実行保証、ロックフリー
ambientModules []*ast.Symbol
ambientModulesOnce sync.Once // 一度だけ計算、並行安全
}
// ロックフリーな遅延初期化
func (c *Checker) GetEmitResolver() *emitResolver {
c.emitResolverOnce.Do(func() { // sync.Onceで並行安全、待機なし
c.emitResolver = newEmitResolver(c)
})
return c.emitResolver
}
// 並行安全なアンビエントモジュール取得
func (c *Checker) GetAmbientModules() []*ast.Symbol {
c.ambientModulesOnce.Do(func() { // 一度だけ計算、並行安全
for sym, global := range c.globals {
if strings.HasPrefix(sym, "\"") && strings.HasSuffix(sym, "\"") {
c.ambientModules = append(c.ambientModules, global)
}
}
})
return c.ambientModules // 計算済みデータへの直接アクセス
}
// atomicによるロックフリーカウンタ操作
func (c *Checker) incrementTypeCount() {
atomic.AddUint32(&c.TypeCount, 1) // ロックフリー、待機時間ゼロ
}
func (c *Checker) incrementSymbolCount() {
atomic.AddUint32(&c.SymbolCount, 1) // 並行安全な統計収集
}
3. 高速化の理論値と実測結果
理論モデル:
総合高速化 = ネイティブ化効果 × 並列処理効果
10倍高速化 = 3.0〜3.5倍 × 3.0〜3.5倍
実測結果（本検証）:
| 測定項目 | Strada → Corsa | 高速化倍率 |
|---|---|---|
| 合計処理時間 | 0.37s → 0.095s | 3.9倍 |
| 型チェック時間 | 0.18s → 0.029s | 6.2倍 |
| メモリ使用量 | 140,538K → 47,098K | 3.0倍効率化 |
Corsaがもたらすのは単なる性能向上ではなく、開発ワークフロー全体の変革が起きると思います：
- リアルタイム開発: 6.2倍高速な型チェックによる即座のIDEによるタイプチェックフィードバック
- 大規模対応: 3倍のメモリ効率化で従来困難な規模のプロジェクトも快適に
- CI/CD最適化: 3.9倍の処理速度でデプロイメントパイプライン大幅短縮
TypeScript 7の正式リリースを前に、Corsaは開発体験のパラダイムシフトを予告しています。最大10倍の高速化が実現する新しいTypeScript開発の世界を、ぜひ体験してみてください！
参考文献
-
Hejlsberg, A. (2025, March 11). "A 10x Faster TypeScript". Microsoft Dev Blogs. https://devblogs.microsoft.com/typescript/
-
Microsoft Corporation. (2025). "TypeScript-Go Repository". GitHub. https://github.com/microsoft/typescript-go
-
Microsoft Corporation. (2025). "@typescript/native-preview Package". npm. https://www.npmjs.com/package/@typescript/native-preview
-
RyanC. "Ask me Anything Session". TypeScript Community Discord. March 13th, 2025, 10 AM PDT
-
Microsoft Corporation. (2025). "TypeScript Compiler Checker". GitHub TypeScript Repository. https://github.com/microsoft/TypeScript/blob/main/src/compiler/checker.ts
-
Microsoft Corporation. (2025). "TypeScript-Go Checker Implementation". GitHub TypeScript-Go Repository. https://github.com/microsoft/typescript-go/blob/main/internal/checker/checker.go