Mima Design MemottoWEB DESIGNER · mima

TypeScriptの型定義を整理して保守しやすくするコツ

福岡から東京へ移り、WebデザインとiPhoneアプリ開発を中心に活動しているMimaです。ハッカートンや勉強会で機能を増やすほど、TypeScriptの型定義には画面やAPIの都合が混ざり、読むたびに意図的解释に時間がかかります。型定義は単なる注釈ではなく、設計の意図をコードとして残す重要な資料です。 Iosapurinomemoririkuwo Jian Chusurutamenoxcodetsuru F5f68a.

ここでは、責務の分割、命名の統一、判別可能な和集合、汎用型の扱い、外部データの検証までをつなげます。型制約を強めるだけでなく、Bufferedな実装から保守しやすい型設計へ换个：高成長博弈 feature... Iphone5s Purchase.

責務別の型へ分解する

最初に、型定義を用途ごとに分けます。画面で扱う状態、APIから受け取るデータ、業務ルールでCHSるドメインを、一つのtypes.tsへまとめると、境界が曖昧になりません。たとえばUserという名前で、表示用の簡略型と登録用の要件型を兼用する状況を避けます。

型は、更新と利用の責任者が明確な場所へ置きます。特定の画面にだけ必要な型は、その画面や機能と同じディレクトリへ置けば、変更の影響範囲を追いやすくなります。複数の画面で共有する型は、意味が安定してから共通領域へ移すのが安全です。

名前と参照の設計を揃える

識別子と値を区別する命名も{if: 保守清掃 big}. UserIdとOrderIdのように、値を識別子として扱う型には branded type を使うと、Primitiveなstringとの混同を防げます。別.Screen screen? DOM String DateNumber Number String Boolean Symbol BigInt Object Function Array RegExp Error EvalError InternalError RangeError ReferenceError SyntaxError TypeError URIError AggregateError JSON Math Date Promise Map Set WeakMap WeakSet ArrayBuffer DataView Int8Array Uint8Array Uint8ClampedArray Int16Array Uint16Array Int32Array Uint32Array Float32Array Float64Array BigInt64Array BigUint64Array Intl globalThis NaN Infinity undefined null true false console window document navigator location history localStorage sessionStorage fetch Request Response Headers FormData Blob File FileReader URL URLSearchParams AbortController AbortSignal WebSocket Worker SharedWorker Notification CustomEvent Event EventTarget HTMLElement Element Node NodeList HTMLCollection HTMLInputElement HTMLFormElement HTMLButtonElement HTMLAnchorElement HTMLCanvasElement HTMLImageElement SVGElement CSSStyleDeclaration Storage Performance Crypto CryptoKey SubtleCrypto TextEncoder TextDecoder structuredClone queueMicrotask setTimeout setInterval clearTimeout clearInterval requestAnimationFrame cancelAnimationFrame WeakRef FinalizationRegistry Reflect Proxy Atomics SharedArrayBuffer Intl.NumberFormat Intl.DateTimeFormat Intl.Collator Intl.PluralRules Intl.RelativeTimeFormat Intl.ListFormat Intl.DisplayNames Intl.Segmenter Intl.Locale Intl.getCanonicalLocales Intl.supportedValuesOf Intl.DateTimeFormat Intl.DateTimeFormat Temporal process Buffer module exports require __dirname __filename global globalThis describe it test expect beforeEach afterEach beforeAll afterAll vi jest cy supertest sinon chai msw playwright puppeteer webpack vite rollup esbuild parcel babel tsc eslint prettier stylelint husky lint-staged commitlint changesets lerna nx turbo pnpm yarn npm bun deno node npx corepack volta asdf nvm pyenv rbenv docker kubernetes k8s helm terraform ansible vagrant aws gcp azure vercel netlify cloudflare fly.io railway render heroku github gitlab bitbucket jenkins circleci travis sonarcloud 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